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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Photophysics of Arylene and Heteroaryleneethinylenes
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Photophysics of Arylene and Heteroaryleneethinylenes

机译：亚芳基和杂亚芳基亚乙烯基的光物理

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摘要

The absorption spectra and the stationary and time-resolved emissions of a series of the title compounds are investigated. Various combinations of ethinylene, p-phenylene, biphenyl-4,4'-diyl, fluorenyl02,7-diyl, 3- or 4-pyridyl, phenanthroline3,8-diyl, 2,2'-bipyridine-5,5'-diyl, and 2,2'-bipyridine-4,4'-diyl molecular units allow a systematic structure variation, e.g., size of #pi# system, type of aza-substitution, linear or angular chains. Most compounds are highly fluorescent. Radiationless deactivation via internal conversion and to a lesser extent intersystem crossing become efficient if forbidden states exist close to the strongly allowed #pi##pi# states (proximity effect) which can be traced back to a smaller size of the #pi# system of reduced conjugation due to meta-linkages of heteroaromatic rings. Aza-substitution may change the deactivation behavior but it does insignificantly influence the absorption and fluorescence spectra. Replacing phenanthrene for 2,2'-bipyridine in the larger compounds does not alter the spectroscopic and the deactivation behaviors.
机译：研究了一系列标题化合物的吸收光谱以及稳态和时间分辨发射。亚乙烯基，对亚苯基，联苯-4,4'-二基，芴基02,7-二基，3-或4-吡啶基，菲咯啉3,8-二基，2,2'-联吡啶-5,5'-二基的各种组合和2,2'-联吡啶-4,4'-二基分子单元允许系统的结构变化，例如，＃pi＃系统的大小，氮杂取代的类型，线性或角链。大多数化合物是高荧光的。如果禁止状态存在于强烈允许的＃pi ## pi＃状态（邻近效应）附近，则可以通过内部转换和较小程度的系统间穿越来实现无辐射停用，这种状态可以追溯到较小的＃pi＃系统尺寸由于杂芳环的间键而减少的共轭。氮杂取代可改变失活行为，但对吸收和荧光光谱影响不大。用较大的化合物代替2,2'-联吡啶的菲不会改变光谱和失活行为。

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