Excited-state properties of trans-(9-anthryl)ethylenes. Effects of geometric distortion about single bond

Bhattacharyya, K. ; Chattopadhyay, S. K. ; Baral-Tosh, S. ; Das, P. K. (1986) Excited-state properties of trans-(9-anthryl)ethylenes. Effects of geometric distortion about single bond Journal of Physical Chemistry, 90 (12). pp. 2646-2651. ISSN 0022-3654

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Official URL: http://pubs.acs.org/doi/abs/10.1021/j100403a017

Related URL: http://dx.doi.org/10.1021/j100403a017

Abstract

The singlet- and triplet-related photophysical properties of four trans-1,2-diarylethylenes, containing methyl, phenyl, 1-naphthyl, and 9-anthryl group as one substituent and 9-anthryl group as the other, have been studied by steady-state and time-correlated fluorescence measurements, laser flash photolysis, and pulse radiolysis. The results show pronounced effects of the photoexcitation-induced geometric distortion (about the anthryl-to-ethylene "single" bond) in rendering fluorescence and triplet-triplet absorption spectra broad and structureless, and in enhancing radiationless processes from singlets, triplets, and exciplexes (with N,N-dimethylaniline). The shortening of triplet lifetimes, and the triplet quenching behaviors toward ferrocene, di-tert-butylnitroxy radical, and oxygen, are also explainable in terms of the torsional relaxation; these effects are similar to, but less pronounced than, those arising from double bond twisting in smaller arylethylene triplets. No photophysical anomaly attributable to ground-state rotamerism is observed in fluid solutions.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:77195
Deposited On:10 Jan 2012 07:42
Last Modified:10 Jan 2012 07:42

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