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Structural effects in the decay kinetics of 1-naphthyl derivative-triethylamine exciplexes

✍ Scribed by L. Biczók; T. Bérces; F. Márta

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
878 KB
Volume
48
Category
Article
ISSN
1010-6030

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✦ Synopsis

The formation and decay kinetics of fluorescence spectra of triethylamine (TEA) exciplexes with naphthalene and 1-naphthyl derivatives were investigated in cyclohexane. The stability of the singlet exciplexes was shown to determine the kinetics. The loosely bound exciplexes between TEA and naphthaIene or I-methylnaphthalene were formed in reversible processes, while the tightly bound complexes of TEA with l-naphthyl-Nmethyl-carbamate or with 1-naphthyl-acetate were the product of irreversible reactions of the singlet excited aromatic acceptor with the ground state aliphatic amine molecules. The increased electron affinity of the carbamate and acetate derivatives promoted the formation of ground state complexes and made possible a second route of exciplex formation. Evaluation of the time-resolved fluorescence results supplied the room temperature rate coefficients for the elementary steps.

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