Buckling cluster-based h-bonded icosahedral capsules and their propagation to a robust zeolite-like supramolecular framework

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Buckling cluster-based h-bonded icosahedral capsules and their propagation to a robust zeolite-like supramolecular framework"


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ABSTRACT Hydrogen-bonded assembly of multiple components into well-defined icosahedral capsules akin to virus capsids has been elusive. In parallel, constructing robust zeolitic-like


cluster-based supramolecular frameworks (CSFs) without any coordination covalent bonding linkages remains challenging. Herein, we report a cluster-based pseudoicosahedral H-bonded capsule


Cu60, which is buckled by the self-organization of judiciously designed constituent copper clusters and anions. The spontaneous formation of the icosahedron in the solid state takes


advantage of 48 charge-assisted CH···F hydrogen bonds between cationic clusters and anions (PF6-), and is highly sensitive to the surface protective ligands on the clusters with minor


structural modification inhibiting its formation. Most excitingly, an extended three-periodic robust zeolitic-like CSF, is constructed by edge-sharing the resultant icosahedrons. The


perpendicular channels of the CSF feature unusual 3D orthogonal double-helical patterns. The CSF material not only keeps its single-crystal character in the desolvated phase, but also 


exhibits excellent chemical and thermal stabilities as well as long-lived phosphorescence emission. SIMILAR CONTENT BEING VIEWED BY OTHERS A THREE-SHELL SUPRAMOLECULAR COMPLEX ENABLES THE


SYMMETRY-MISMATCHED CHEMO- AND REGIOSELECTIVE BIS-FUNCTIONALIZATION OF C60 Article 15 April 2021 SUPRAMOLECULAR POLYNUCLEAR CLUSTERS SUSTAINED CUBIC HYDROGEN BONDED FRAMEWORKS WITH


OCTAHEDRAL CAGES FOR REVERSIBLE PHOTOCHROMISM Article Open access 30 March 2024 PHASE ENGINEERING OF POLYOXOMETALATE ASSEMBLED SUPERSTRUCTURES Article 25 June 2024 INTRODUCTION Nature is


capable of spontaneous association of multiple protein subunits into giant functional superstructures via precise biological self-organization protocols. One accessible and fascinating


natural example is a virus capsid, which is the outer shell of a virus, comprising many non-covalently linked protein subunits that self-assemble into an icosahedral shell. The icosahedral


design by natural systems has myriad advantages, including aesthetic appeal, high stability, and storage capacity, as well as minimal information coding requirements1. Inspired by this


elegant biology, researchers have recently pursued self-organization through supramolecular interactions, such as metal-coordination bonds, to spontaneously fabricate multiple smaller


subunits into larger artificial nanoconstruct, to mimic viral geometries2,3,4. In this regard, a few cases of icosahedral coordinative capsules have been successfully achieved5,6,7,8,9. By


contrast, buckling well-defined H-bonded icosahedra is much more challenging, let alone gaining insights into assembled mechanism, in part due to the difficulty in manipulating relatively


weak H-bonds compared with strong coordination covalent bonds. However, rational design protocols regarding icosahedral H-bonded assemblages are significant in that protein-protein


interactions described above are mainly formed from many weak noncovalent interactions including hydrogen bonds. Supramolecular ensembles are latterly possible with atom-precise


coinage-metal (Cu/Ag/Au) clusters as attractive building blocks. These ultrasmall coinage-metal clusters represent a new category of crystalline materials, which typically consist of a metal


core passivated by a ligand shell. That the library of protective ligands is extensive and affords diverse noncovalent contacts, which directs cluster-cluster assembly to create various


well-defined superstructures10,11,12, including helical aggregates13,14,15,16 and hierarchical assemblies17,18,19,20. Nevertheless, without strong coordinate bonding linkages21,22,23,24,


assembled cluster-based supramolecular systems are relatively fragile and easily collapsed architectures to polycrystallinity, particularly at high temperatures or after the removal of guest


solvents, which has hampered the more extensive study of their potential applications. Additionally, programmed assembly of cluster tectons into sophisticated 3D superstructures and/or


periodic zeolitic-like crystalline supramolecular networks, topologically similar to metal-organic frameworks (MOFs)25,26,27,28,29,30 but conferring a significant advantage of


solution-processability, poses a formidable challenge. The main reason comes from the complexity of intercluster interactions, and/or the lack of suitable cluster modules and


structure-directing forces. Based on the above considerations, in this work, we report the discovery of cluster-based H-bonded pseudo icosahedral capsules Cu60 spontaneously formed through


the assembly of cationic copper clusters and anions (PF6−), by means of 48 charge-assisted CH···F hydrogen bonds. The key geometric fragments of the icosahedron could be detected by


cold-spray ionization mass spectrometry (CSI-MS), which provides insight into the underlying rules of multicomponent H-bonded assembly. Moreover, each intrinsic hollow icosahedral capsule is


connected to six adjacent equivalent ones by edge-sharing to generate a robust three-periodic zeolitic-like supramolecular architecture with extrinsic helical channels, conferring thermal


durability, and resistance to acids and bases. The resulting assembled 3D superstructure, referred to as cluster-based supramolecular frameworks (CSFs), gives a case of controlling


assemblies of stable zeolitic-like cluster-based supramolecular solids without utilizing strong covalent and coordinate bonding linkage, and is an emerging link between coinage-metal


clusters and hydrogen-bonded organic frameworks (HOFs). RESULTS SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF CLUSTER-BASED TECTONS Actively seeking accessible construction strategies to


create 3D stable crystalline CSFs, our attention was initially captivated by robust HOFs materials, such as well-known HOF-1 that relies on the H-bonded assembly of purely organic tectons


with tetrahedral geometry to form 3D crystalline networks31,32. Taking inspiration from structural characteristic feature of HOF-1 (Supplementary Fig. 1), we envisioned that harnessing


tetrahedrally symmetric clusters as modular building blocks may facilitate building robust CSFs with distinctive topologies and architectures. To this end, we synthesized a tetrahedral


copper cluster [Cu5L4((_p_-F-Ph)3P)4]PF6 (1) (where 2-mercapto-1-phenylimidazole = HL, and (_p_-F-Ph)3P = tris(4-fluorophenyl) phosphine) through reducing the copper salts with NaBH4 in the


presence of HL and (_p_-F-Ph)3P under ambient conditions. The cluster structure of 1 was firstly elucidated by NMR spectroscopy, of which 1H NMR exhibits a set of shifted ligand signals


(Supplementary Fig. 2), verifying the protection of the cluster surface by the mixed ligands. The precise mass and composition of 1 were further confirmed by electrospray ionization mass


spectrometry (ESI-MS) in positive mode (Supplementary Fig. 3 and Supplementary Table 1). The parent cluster ion was found at the most dominant peak, _m_/_z_ 2283.0142, which could be


identified with isotopic envelopes corresponding to [Cu5L4((_p_-F-Ph)3P)4]+ (calc. _m_/_z_ = 2283.0307). Density functional theory (DFT) optimized structure of [Cu5L4((_p_-F-Ph)3P)4]+,


characterized as an energy minimum, was found to be of _S_4 symmetry (Supplementary Fig. 4), which agrees quite well with the X-ray structure (vide infra). TD-DFT calculated results match


well with the experimental UV/Vis absorption spectrum of 1 measured in dichloromethane (CH2Cl2), which showed two major UV absorption bands at 358 and 368 nm and a tail up to about 400 nm


(Supplementary Fig. 5), indicating the cluster retains intact in solution. Colorless crystals of 1 suitable for X-ray crystallography were obtained by slow vapor diffusion of _n_-hexane into


a concentrated CH2Cl2 solution of the corresponding cluster (PF6− salt) at ambient temperature. Microscopic image of single crystals, exhibit rhombic dodecahedra shape with twelve


well-defined diamond facets (Fig. 1a). Single-crystal X-ray diffraction (SCXRD) analysis revealed that 1 crystallizes in the higher-symmetry cubic crystal system with the non-centrosymmetric


space group \(P {\bar{4}}\) 3n (No. 218, Supplementary Table 2). Its overall composition contains a cationic cluster [Cu5L4((_p_-F-Ph)3P)4]+, as well as one PF6− counterion and interstitial


CH2Cl2 molecules. As portrayed in Fig. 1b, the structural anatomy of [Cu5L4((_p_-F-Ph)3P)4]+ can be viewed as a Cu5 kernel wrapped by four peripheral (_p_-F-Ph)3P and four deprotonated L−


ligands. The metal core adopts a centered tetrahedral geometry. The Cu-Cu bond length in the metal skeleton from the central Cu atom to the vertexes of the Cu4 tetrahedron is equal (2.655(1)


Å), suggestive of the presence of significant intramolecular cuprophilic interactions. It is worthy of note that such a centered tetrahedral Cu5 skeleton is quite unusual, as a Cambridge


Structural Database (CSD) search33 yielded previously reported some discrete Cu5 clusters featuring a planar conformation or a bipyramidal geometry (Fig. 1c)34,35. The center Cu atom is


tetrahedrally bonded to all four L− molecules via four Cu-S bonds, while each terminal Cu atom in the Cu4 tetrahedron is tetrahedrally completed by two _μ_3-S atoms and one N atom from three


different L− molecules plus one P atom from one (_p_-F-Ph)3P. Thus, the entire cationic cluster lies in a special position with _S_4 symmetry. CRYSTALLINE CLUSTER-BASED H-BONDED ICOSAHEDRAL


ASSEMBLY Inspection of the rhombic dodecahedral crystal habit in the case of 1 is unexpected among crystalline forms of coinage metallic clusters, which is evocative of an example of


icosahedral viruses crystallized into cubic crystals in a similar dodecahedral shape36. This inspire us to conjecture that extraordinary arrangement and packing of cluster tectons might


exist. To our delight, the most attractive structural feature of 1 is that twelve molecular copper clusters per unit cell self-assemble into an enclosed approximately icosahedral capsule


denoted as Cu60 (Fig. 1d) with an approximate diameter of 3.0 nm. The surface of the pseudo icosahedron contains two types of triangular faces (Fig. 1e): 8 equilateral triangles and 12


isosceles triangles, each equilateral triangle with side lengths of 16 Å (the centroid-centroid distances of two adjacent clusters) and each isosceles triangle with side and base lengths of


16 and 13 Å, respectively. It is worth noting that this is the only possible combinatorial outcome for the pseudo icosahedron buckled from these equilateral triangles and isosceles


triangles, based on the ChatGPT prediction37. The internal hollow icosahedral capsule Cu60 could accommodate a sphere with a diameter of about 25 Å, corresponding to a sphere volume of ~8177


 Å3. Our observation of the supramolecular icosahedral assembly that involves solid-state aggregation of individual clusters is intriguing. It was previously reported that atomically precise


metal nanoclusters functionalized with capsid-targeting ligands which were used to label specific components of the surface of enteroviruses created icosahedral arrangement of


clusters38,39. But once the absence of capsid-targeting ligands and without linking to the viral surfaces, cluster-based icosahedra are difficult to achieve. More importantly, the atomically


accurate cluster-based icosahedral capsule will provide much more detailed information for further identifying the possible assembled origin of the icosahedron as the largest of the


Platonic solids. Figure 1f shows the electrostatic potential (ESP) mapped onto the electron isodensity surface of [Cu5L4((_p_-F-Ph)3P)4]+. It is calculated that the surface ESP is highly


positive and may be strongly inclined to interact with negatively charged species (i.e., counter anions) to make supramolecular assemblages. As a result, PF6− counterions lie at the center


of equilateral triangles of the icosahedron, wherein half fluoride atoms of each PF6− anion interact with three neighboring [Cu5L4((_p_-F-Ph)3P)4]+ clusters to form a supramolecular trimer


(Fig. 1g). Each copper cluster located at the vertice of icosahedron could be visualized as two parts, a Cu(_p_-F-Ph)3P and a Cu3L4((_p_-F-Ph)3P)3 moiety, which points inside and outside the


surface of icosahedral capsule, respectively. As illustrated in Fig. 1g, a closer inspection of the intermolecular contact patterns reveals each F atom of the PF6− participates in two


H-bonds with two fluorobenzenes from two neighboring Cu(_p_-F-Ph)3P moieties by means of C–H···F charge-assisted hydrogen bonds (_d_H···F = 2.56–2.61 Å and _θ_C-H···F = 127.3°–130.5°). These


small H–F separations match well with previous studies of other fluorobenzenes in crystals40. In total, the icosahedral capsule is held together by way of 48 CH···F hydrogen bonds. Such


cluster-based icosahedral H-bonded capsule Cu60 is reminiscent of copies of identical protein clusters assembled into icosahedral viral capsids. As mentioned at the outset, some discrete


supramolecular coordinative icosahedral entities have been identified, such as molybdenum oxide cluster Mo1325 and metal-organic capsule Fe126,7. However, bonding energy for hydrogen bonds


(25–40 kJ mol−1)41,42 is generally much smaller than those of coordinate covalent bonds (90–350 kJ mol−1)42, making well-defined H-bonded icosahedrons more challenging to assembly than their


coordination counterparts. It is especially interesting to note the icosahedral Cu60 shows distinct trigonal types, which are different from those observed in the face-directed coordinative


icosahedra. The trigonal panels of the former which are constructed from anions hydrogen-bonded to cationic clusters produce interesting _C_3-symmetric facial chirality (Fig. 1g), while the


trigonal faces of the latter are generated from planar tritopic linkers coordination-bonded to metal acceptors (Supplementary Fig. 6)6,7. Additionally, from the view of capsule size, the


diameter of the supramolecular H-bonding capsule Cu60 is 3.0 nm, making it comparable to that of the nanosized icosahedral Mo132 (2.9 nm). CSI-MS CHARACTERIZATION To explore the disassembly


behavior of the icosahedral nanoconstruct in solution, we carried out CSI-MS characterization, as a variant of ESI-MS operating at low temperature. The CSI-MS was measured by dissolving


crystals of 1 in CH2Cl2, in which the ion source temperature is 0 °C. Positive-mode CSI-MS affords three sequentially charged ion species (2+ to 4+), centered at _m_/_z_ 3497.526, 3903.006


and 4711.996, that we attributed to cluster-based H-bonded oligomers, including trimeric {[Cu5L4((_p_-F-Ph)3P)4]3·PF6}2+, pentameric {[Cu5L4((_p_-F-Ph)3P)4]5·(PF6)2}3+, and octameric


{[Cu5L4((_p_-F-Ph)3P)4]8·(PF6)4}4+, respectively. The _m_/_z_ values along with isotopic distribution patterns of each charge state closely match the simulated ones (Fig. 2), verifying the


assignment. These H-bonded oligomers showcase the increasing cluster aggregations concomitant with the associated increase in anions PF6− present which bring discrete copper clusters


together into the oligomers. The optimized H-bonded oligomeric structures (Supplementary Fig. 7) are quite similar to those observed in the crystallographic data. These H-bonded species are


considered as key geometric fragments of the icosahedral units, which is primarily important to understand the mechanism of formation of the icosahedral capsules from this reaction system.


Especially, the detection of the most dominant peak of the trimeric {[Cu5L4((_p_-F-Ph)3P)4]3·PF6}2+, is significant, which represents the basic trigonal unit of the icosahedron. CSI-MS


results indicate that the charge-assisted CH···F contacts play a pivotal role in the assembly of copper clusters coupling with anions into identifiable H-bonded oligomers in solution, prior


to crystallization. 3D ROBUST ZEOLITIC-LIKE CSFS Fascinatingly, each pseudo icosahedral capsule―considered to be a supramolecular secondary building unit―connects with six other icosahedral


ones through sharing bases of isosceles triangles of the pseudo icosahedron, thereby yielding an extended three-periodic zeolitic-like CSF (Fig. 3a), which sets it apart from HOFs and MOFs.


Of note, topologically, if each discrete cluster is regarded as a 10-connected node, the whole architecture of the CSF is an unimodal 10-connected framework with the Schläfli symbol


(315.423.55). When viewed in projection down the _a_ axis, the intricate 3D CSF is seen to contain two types of 1D infinite channels (α and β). As illustrated in Fig. 3b, the α-type channel


has a cross-section of 3.7 Å _×_ 7.2 Å to which the phosphine moieties of clusters are exposed, and guest CH2Cl2 solvents are inside the channel. The β-type channel is formed with


phenylimidazole arms of clusters and its channel cross-section is 7.0 Å × 7.0 Å. Surprisingly, in tunnel β, the clusters are arranged to form 1D spirals, with four clusters adopting


different rotations per spiral of unit cell length. The spirals in turn are intertwined to give the two strands of an infinite double helix with the same right-handedness (Fig. 3c). The


helical features of the double helix are defined by a pitch length of 5.2 nm and width of 3.6 nm. The entwined strands are stabilized by charge-assisted CH···F H-bonding interactions between


the cationic clusters and anions. The tunnels alongside these double helices are filled with disordered CH2Cl2. The existence of guest molecules CH2Cl2 was also supported by 1H NMR


(Supplementary Fig. 2). It is significant to observe that identical supramolecular double helices are produced along _a_, _b,_ and _c_-axes, respectively, therefore producing unusual


mutually perpendicular double helices in three dimensions (Fig. 3d). It is worth of noting that it is only recently that 1D double-helical self-assembly has been observed in the realm of


coinage metallic clusters aggregates13,14,15,16. Hence, the superstructure of 1 contains another structural feature of double-stranded helicates which extend in three perpendicular


directions, forming 3D orthogonal double-helical patterns, which is advocative of the assembly of double-stranded DNA into various nanostructures in different dimensions43,44,45. Despite the


lack of strong metal-coordination bonds, it is the CSF, achieved by charge-assisted hydrogen bonds, that might exhibit improved stability because of the additional electrostatic attraction


between the components46,47. To confirm the idea, we accessed the chemical durability of crystals of 1 in aqueous solutions with a broad pH range (pH 1–14). After solid 1 was soaked in the


solutions above-mentioned for three days, there was no obvious difference in morphology and color (Supplementary Fig. 8). Crystals of 1 still retained their single crystallinity, enabling


the SCXRD and their unit cell parameters are almost identical to that of as-synthesized 1. Moreover, the powder XRD (PXRD) patterns of the sample after prolonged treatment in acidic and


basic conditions agree well with the simulated, suggesting that the integrity of the framework is preserved toward both acids and bases (Fig. 4a). Thermogravimetric analysis (TGA) profile


(Fig. 4b) of freshly prepared crystals 1 showed the first continuous weight loss stepping from room temperature to ~170 °C corresponds to the loss of CH2Cl2 molecules. The superstructure of


1 began to decompose at a temperature higher than ~215 °C. To thoroughly understand the thermal robustness of the CSF of 1, we measured variable-temperature PXRD, which revealed that no


phase transition or architecture collapse at elevated temperature range 30–200 °C (Fig. 4c). The PXRD results reflect an uncharacteristic robustness of the cluster-based H-bonded assembly


even after removal of the occluded solvent molecules from channels, where many other noncovalent coinage-metal cluster-based frameworks would fail. By slowly heating crystals of 1 to 170 °C


under inert atmospheres or in vacuo, to our delight, 1 could be fully desolvated to obtain CH2Cl2-free crystals 1-D. The complete removal of guest CH2Cl2 was also confirmed by 1H NMR


spectroscopy (Supplementary Fig. 2), where the chemical shift at 5.25 ppm corresponding to CH2Cl2 disappears completely after activation. The desolvated crystals 1-D exhibited high thermal


stability with negligible weight loss occurred until ~215 °C (Fig. 4b). No significant loss of crystallinity was observed when the CH2Cl2 molecules were removed gently. The resultant


crystals 1-D were successfully examined by X-ray crystallographic analysis, explicitly confirming the single-crystal-to-single-crystal transformation. 1-D retained the same \(P {\bar{4}}\)


3n space group (Supplementary Table 2) as 1, with shortened lattice parameters from 26.1645 Å for (1) to 25.8013 Å (1-D). The mechanical contraction of the network, with ~2% reduction of the


initial unit cell volume, occurs without damaging the crystal upon the full removal of occluded CH2Cl2. The atomic resolution of SCXRD allows us to discern subtle variations in the CSF


before and after heating. As displayed in Fig. 3b, the portal of open channel α′ in 1-D kept almost unchanged as observed in the original channel α in 1. Closer examination of channel β′


along the _a_-direction (Fig. 3c), however, revealed structural subtleties, wherein the chelating arrangement of the imidazole plane restricts its rotation, but a clear rotation of the


phenyl group attached to the imidazole moiety partially blocks the portal of the open channel β′, resulting in the shrinkage of the resulted window size (4 Å × 4 Å). CO2


adsorption-desorption measurement for 1-D at 273 K showed a fully reversible type-I Langmuir profile (Supplementary Fig. 9), verifying the supramolecular architectural stability and


permanent microporous characteristic of 1-D. Notably, the framework of 1-D can revert to its original architecture of 1 when simply recrystallized from CH2Cl2, featuring the structural


dynamism and regeneration ability of the CSF. EFFECT OF LIGAND ON THE CSF In general, the cluster-cluster interactions can be tailored via modification of the protective shield of ligands.


For 1, due to the inductive effect associated with the fluorine atom at the _para_-position of benzene, the positively polarized surfaces of the fluorinated aromatics are prone to interact


with electron-rich anions. We reasoned that substitution of the _para_-F atom with H atom may be expected to disrupt CH···F hydrogen bonds, further markedly affecting the structure and


stability of the resulting CSFs. To verify this, we tried to synthesize another analog [Cu5L4(PPh3)4]PF6 (2), by replacing P(C6H4F)3 with triphenylphosphine (PPh3), under identical synthesis


conditions. X-ray diffraction analysis at 173 K for a single crystal of 2 established that it occurs in the centrosymmetric tetragonal space group _P_4/_ncc_ (No. 130, Supplementary Table 


3) with the composition of [Cu5L4(PPh3)4]PF6·CH2Cl2, proved by ESI-MS (Supplementary Fig. 10 and Supplementary Table 4). As anticipated, the cationic cluster [Cu5L4(PPh3)4]+ is isostructural


with [Cu5L4((_p_-F-Ph)3P)4]+. In comparison with 1, however, SCXRD revealed that 2 exhibits distinctly different cluster-based assembly behavior, whereby [Cu5L4(PPh3)4]+ clusters


spontaneously organize into another 3D CSF. The topology of 2 can be described as a compressed pcu (primitive cubic) net with nodes defined as [Cu5L4(PPh3)4]+ clusters. The basic repeating


unit of the 3D CSF contains a double cubane-like cage fused by two same compressed cubic supramolecular cages (Supplementary Fig. 11), of which each is formed by eight clusters through weak


tecton-tecton contacts (i.e., weak CH···π and H···H interactions) (Supplementary Fig. 12). Interestingly, self-assembled hexafluorophosphate-dichloromethane anionic clusters of


[PF6·(CH2Cl2)4]− are docked in the confined cavities of the double cubane-like cage, respectively. Structural characterization reveals that PF6− anion in the [PF6·(CH2Cl2)4]− only uses one


fluoride atom as quadruple H-bond acceptors to bond with four CH2Cl2 molecules as single H-bond donor, thereby resulting in four weak nonconventional C–H···F hydrogen bonds (_d_H···F = 2.58 


Å and _θ_C-H···F = 144°). Strikingly, [PF6·(CH2Cl2)4]− has a _C_4 symmetry with a 4-fold axis passing through F-P-F of PF6−, thus producing two equivalent enantiomers, _R_-[PF6·(CH2Cl2)4]−


and _S_-[PF6·(CH2Cl2)4]− (Supplementary Fig. 13). Notably, this is the structural evidence on chiral PF6−-CH2Cl2 solvated anionic clusters imprisoned in the supramolecular cage. The


calculated independent gradient model based on Hirshfeld partition (IGMH) analysis on the supramolecular species {[Cu5L4((_p_-F-Ph)3P)4]+·PF6−} indicates the apparent strong CH···F


interactions in the green section occur between C–H groups of the fluorobenzene rings and F atoms from PF6− anion (Fig. 5a), which is crucial for the enhanced stability of the rigid


supramolecular framework in 148,49,50. In contrast, 2 does not form the stable target {[Cu5L4(PPh3)4]+·PF6−} due to calculated negligible weak CH···F interactions between PF6− and phenyl


rings (Fig. 5a). On the contrary, the PF6− in 2 has a high tendency to be solvated by CH2Cl2 molecules, leading to the formation of solvated anions as discussed above. With the above


considerations in mind, we surmised that the absence of strong charge-assisted CH···F H-bonding interactions in 2 will make the CSF more labile. As anticipated, the crystals 2 are extremely


fragile, quickly cracked, and lost its crystallinity after being taken out of the mother liquor. SOLID-STATE OPTICAL AND LUMINESCENCE PROPERTIES Solid-state UV/Vis diffuse-reflectance


spectroscopy of the crystalline sample of 1 displayed that it is transparent in the visible region of 400–800 nm (Fig. 5b). Subsequently, we investigated the steady-state photoluminescence


(PL) spectra of 1 at room temperature, which presented a weak green emission band at around 547 nm upon excitation at 365 nm, with a substantial Stokes shift (~182 nm). Additionally, the


temperature-dependent PL measurements were conducted from 300 to 80 K (Fig. 5b). The PL emission intensity is enhanced as the temperature changes from 300 to 80 K. A significant blue shift


was observed from 547 to 510 nm with the temperature decrement. The increased emission intensity upon cooling is a typical phosphorescence characteristic owing to the effective reduction of


nonradiative pathways at low temperature, whereas the 40-nm hypsochromic-shifted emission may be caused by the restriction of the rotation of the phenyl group attached to the imidazole


moiety at low temperature. Remarkably, the time-resolved PL decay curve gave relatively long lifetimes of 13–16 ms at 80–170 K (Supplementary Table 5), and the green afterglow was visible to


the naked eyes over 0.8 s after switching off the UV lamp (Fig. 5c). Both long emission lifetime (millisecond) and large Stokes shift in 1 suggest the green emission mechanism is


phosphorescence-type, primarily emanating from a process involved ligand-to-metal charge transfer (LMCT) or ligand-to-metal-metal charge transfer (LMMCT)51,52,53. Of note, the


millisecond-long emission with obvious afterglow in crystalline 1 surpasses other thiolate-protected luminescent copper clusters with microsecond lifetimes53,54,55,56, which are difficult to


observe by the naked eyes after removing the light source. DISCUSSION In summary, the results presented here demonstrate that the icosahedral H-bonded nanocapsules can be assembled from


individual clusters featuring with tetrahedral metal cores and anions. These capsules further propagate through edge-sharing into a 3D zeolitic-like CSF, offering the distinct advantages of


being both excellently chemically and thermally stable. This intrinsic stability can be ascribed to the multiple charge-assisted CH···F hydrogen bonds. This wholly cluster-based H-bonding


framework expands the scope of complicated cluster-based supramolecular architectures and bridges the gap between coinage-metal clusters and HOFs. We expect that this finding can inspire


future exploration of the uncovering zeolitic-like CSFs, which may in turn find applications in, for example, gas storage, separation processes, and catalysis. METHODS SYNTHETIC PROCEDURE


FOR 1 3.0 mL CH2Cl2/CH3OH (_v_:_v_ = 2:1) solution containing copper(II) trifluoroacetate hydrate (43.4 mg, 0.15 mmol) and tetrabutylammonium hexafluorophosphate (11.6 mg, 0.03 mmol) was


stirred for 10 min, and then (_p_-F-Ph)3P (63.2 mg, 0.2 mmol) and 2-mercapto-1-phenylimidazole (35.0 mg, 0.2 mmol) were added under vigorous stirring. After stirring for another 15 min, a


freshly prepared solution of NaBH4 (20.0 mg dissolved in 1.0 mL water) was added dropwise to the mixture under vigorous stirring. The reaction continued for 6 h at room temperature and aged


at 4 °C for 12 h. Next, the aqueous phase was removed and the obtained organic phase was washed with water for several times. Finally, the resulted solution was centrifuged for 3 min at


10000 rpm min−1, and the red-brown solution was filtered. Dodecahedral rhombohedral colorless crystals of 1 were obtained via slow diffusion of _n_-hexane into the cluster solution after


three days (20% yield based on Cu). Elemental analysis (%) calcd for C109H78S4P4F12N8Cl2Cu5: C 55.27, H 3.32, N 4.73; Found: C 54.84, H 3.15, N 4.42. High-resolution ESI-MS: _m_/_z_ = 


2283.0307 ([Cu5(C9H8N2S)4(P(C6H4F)3)4]+). SYNTHETIC PROCEDURE FOR 2 2 was synthesized by a similar procedure of 1, except PPh3 (52.6 mg, 0.2 mmol) instead of (_p_-F-Ph)3P. Block colorless


crystals were obtained after four days (14% yield based on Cu). Elemental analysis (%) calcd for C108H88S4P5F6N8Cu5: C 58.62, H 4.01, N 5.06; Found: C 58.93, H 3.95, N 4.75. High-resolution


ESI-MS: _m_/_z_ = 2067.173 ([Cu5(C9H8N2S)4(P(C6H5)3)4]+). DATA AVAILABILITY All data that support the findings of this study are available within the paper and its supplementary information


files, and also available from the corresponding author upon request. Crystallographic data for structures reported in this article have been deposited at the Cambridge Crystallographic Data


Centre (CCDC), under deposition numbers CCDC 2366513 (1), 2366514 (1-D), and 2366515 (2). Copies of the data can be obtained free of charge via https://www.ccdc.cam.ac.uk/structures/. All


other data supporting the findings of the study, including experimental procedures and compound characterization, are available within the paper and its Supplementary Information, or from


the corresponding author upon request. Coordinates of the optimized structures are provided in the source data file. Source data are provided with this paper. REFERENCES * Edwardson, T. G.


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implications for optoelectronic applications. _ACS Appl. Nano Mater._ 7, 32–60 (2024). Article  CAS  Google Scholar  Download references ACKNOWLEDGEMENTS This work was financially supported


by the National Natural Science Foundation of China (Nos. 92361301, 22325105, 52261135637, 22171164), the Natural Science Foundation of Fujian Province (No. 2022J01298). We thank Dr.


Shu-Ting Wu (Fuzhou University) and Prof. Da-Qiang Yuan (Fujian Institute of Research on the Structure of Matter) for valuable discussions and assistance in chirality and topology analysis.


The Instrumental Analysis Centre of Huaqiao University for analytical characterization is also acknowledged. AUTHOR INFORMATION Author notes * These authors contributed equally: Zhan-Hua


Zhao, Bao-Liang Han. AUTHORS AND AFFILIATIONS * College of Materials Science and Engineering, Huaqiao University, Xiamen, PR China Zhan-Hua Zhao, Qi-Lin Guo, Jing-Qiu Zhuo, Yong-Nan Guo, 


Jia-Long Liu & Geng-Geng Luo * Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal


Materials, Shandong University, Jinan, PR China Bao-Liang Han, Wen-Xin Wang, Ping Cui & Di Sun * College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, PR China


Hai-Feng Su Authors * Zhan-Hua Zhao View author publications You can also search for this author inPubMed Google Scholar * Bao-Liang Han View author publications You can also search for this


author inPubMed Google Scholar * Hai-Feng Su View author publications You can also search for this author inPubMed Google Scholar * Qi-Lin Guo View author publications You can also search


for this author inPubMed Google Scholar * Wen-Xin Wang View author publications You can also search for this author inPubMed Google Scholar * Jing-Qiu Zhuo View author publications You can


also search for this author inPubMed Google Scholar * Yong-Nan Guo View author publications You can also search for this author inPubMed Google Scholar * Jia-Long Liu View author


publications You can also search for this author inPubMed Google Scholar * Geng-Geng Luo View author publications You can also search for this author inPubMed Google Scholar * Ping Cui View


author publications You can also search for this author inPubMed Google Scholar * Di Sun View author publications You can also search for this author inPubMed Google Scholar CONTRIBUTIONS


G.-G.L. and D.S. conceived and designed the experiments; Z.-H.Z., and B.-L.H. and H.-F.S. conducted synthesis and characterization; Z.-H.Z., B.-L.H., Q.-L.G., W.-X.W., and G.-G.L. researched


and analyzed data; J.-Q.Z., Y.-N.G., J.-L.L., and P.C. contributed to scientific discussion; Z.-H.Z., G.-G.L. and D.S. wrote the manuscript. All authors discussed the results and commented


on the manuscript. CORRESPONDING AUTHORS Correspondence to Geng-Geng Luo or Di Sun. ETHICS DECLARATIONS COMPETING INTERESTS The authors declare no competing interests. Reprint and


permissions information is available at http://www.nature.com/. PEER REVIEW PEER REVIEW INFORMATION _Nature Communications_ thanks the anonymous reviewer(s) for their contribution to the


peer review of this work. A peer review file is available. ADDITIONAL INFORMATION PUBLISHER’S NOTE Springer Nature remains neutral with regard to jurisdictional claims in published maps and


institutional affiliations. SUPPLEMENTARY INFORMATION SUPPLEMENTARY INFORMATION TRANSPARENT PEER REVIEW FILE SOURCE DATA SOURCE DATA RIGHTS AND PERMISSIONS OPEN ACCESS This article is


licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, distribution and reproduction in any


medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if you modified the licensed


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licence, visit http://creativecommons.org/licenses/by-nc-nd/4.0/. Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Zhao, ZH., Han, BL., Su, HF. _et al._ Buckling cluster-based


H-bonded icosahedral capsules and their propagation to a robust zeolite-like supramolecular framework. _Nat Commun_ 15, 9401 (2024). https://doi.org/10.1038/s41467-024-53640-4 Download


citation * Received: 31 July 2024 * Accepted: 16 October 2024 * Published: 30 October 2024 * DOI: https://doi.org/10.1038/s41467-024-53640-4 SHARE THIS ARTICLE Anyone you share the following


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