Rotamerism in (2-anthryl)ethylenes. Evidence from fluorescence lifetimes and quenching studies

Autor:	Ernst Fischer, T. Wismontski-Knittel, P. K. Das
Rok vydání:	1984
Předmět:	chemistry.chemical_compound Quenching (fluorescence) chemistry Ethyl iodide Ultrafast laser spectroscopy General Engineering Flash photolysis Vibronic spectroscopy Quantum yield Physical and Theoretical Chemistry Photochemistry Excimer Fluorescence
Zdroj:	The Journal of Physical Chemistry. 88:1163-1168
ISSN:	1541-5740 0022-3654
DOI:	10.1021/j150650a029
Popis:	The fluorescence decay of trans (2-anthryl)ethylenes containing phenyl, 2-naphthyl, and 2-thienyl groups as the second substituent is biexponential. The decay profiles in benzene are analyzable in terms of two lifetimes in the ranges 6-11 and 17-30 ns, respectively. The complex decay behavior as well as the observation of excitation wavelength dependence of fluorescence spectra, quantum yields, exciplex emission maxima, and fluorescence quenching constants (with oxygen, ethyl iodide (EtI), and N,N-dimethylaniline (DMA) as quenchers) is attributed to the existence of quasi-energetic rotamers in solutions of (2-anthryl)ethylenes. Exciplex lifetimes and transient absorption spectra of radical anions obtained by nanosecond laser flash photolysis in the presence of N,N-dimethylaniline are also presented. 17 references, 6 figures, 6 tables.
Databáze:	OpenAIRE
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