Excimer fluorescence of poly(polyoxytetramethylene-glycol naphthalene-2,6-dicarboxylate)

ABSTRACT Time resolved emission spectra and fluorescence decay for poly(polyoxytetramethylene-glycol naphthalene-2,6-dicarboxylate) (PTMN) and its model compound dimethyl

naphthalene-2,6-dicarboxylate (DMN) have been studied by time correlated single photon counting technique both in CHCl3 solution and in the neat polymer. The existence of intra-chain excimer

interaction between remote chromophores in the PTMN chain was demonstrated in dilute solutions. Inter-chain excimer interaction was demonstrated in concentrated solutions in CHCl3 for both

PTMN and DMN. For a neat PTMN polymer sample which had been laid aside for a long time direct excitation of the excimer fluorescence from stacked pairs of the chromophores of the chain has

been observed. A monomer fluorescence peak at λ400 nm was also observed in the early gated emission spectra when excited by λ381 nm radiation at room temperature. This is probably originated

from hot band excitation. Evidence for the excimer dissociation has been obtained in concentrated solutions of both DMN and PTMN and in the neat polymer. The ratios of the pre-exponential

coefficients of the shorter lifetime term to that of the longer lifetime term in the excimer fluorescence decay were found to be −1/3, −1/2, and −1/5 for the concentrated solution of DMN,

the concentrated solution of PTMN and the neat polymer respectively. This result is different from the value −1 to be expected from Birk’s diffusion controlled mechanism. SIMILAR CONTENT

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AFFILIATIONS * Institute of Chemistry, Academia Sinica, Ti Cao, Xingkang Zhang & Renyuan Qian Authors * Ti Cao View author publications You can also search for this author inPubMed 

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Poly(polyoxytetramethylene-glycol naphthalene-2,6-dicarboxylate). _Polym J_ 21, 489–497 (1989). https://doi.org/10.1295/polymj.21.489 Download citation * Issue Date: 01 June 1989 * DOI:

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currently available for this article. Copy to clipboard Provided by the Springer Nature SharedIt content-sharing initiative KEYWORDS * Excimer Fluorescence * Preformed Excimer Site *

Time-Resolved Fluorescence Spectra * Poly(ether-ester) * Fluorescence Decay