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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Fluorescence of Pyrenyl and Carbazolyl Derivatives in Liquid Solution and Solid Film
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Fluorescence of Pyrenyl and Carbazolyl Derivatives in Liquid Solution and Solid Film

机译：Liquid和咔唑衍生物在溶液和固体膜中的荧光

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摘要

A systematic investigation of the effects of stereochemistry and solid-state morphology on emission characteristics were performed using glass-forming pyrenyl and carbazolyl derivatives as neat films in PMMA and cholesteric liquid crystalline glass. At high dilution in tetrahydrofuran, pyrenyl derivatives were prone to form intramolecular excimers whereas carbazolyl derivatives showed no evidence for excimers. Both pyrenyl and carbazolyl derivatives at 10~(-3) to 10~(-2) M in isotropic and ordered solid hosts exhibited mostly monomer emission. In neat films, intermolecular excimers prevailed in pyrenyl derivatives whereas carbazolyl derivatives showed evidence for monomer emission as well. One feature that distinguishes carbazolyl derivatives from poly(N-vinylcarbazole) is the observed fine structures in the fluorescence spectra of thin films. Order parameters characterizing the helical alignment of pyrenyl and carbazolyl pendants with a cholesteric host were determined with circularly polarized fluorescence spectroscopy. The results indicate the relative ease of aligning pyrenyl groups, presumably because of the more favorable regiochemistry and conformational flexibility.
机译：使用形成玻璃的pyr基和咔唑基衍生物作为PMMA和胆甾型液晶玻璃中的纯净膜，对立体化学和固态形态对发射特性的影响进行了系统的研究。在四氢呋喃中高稀释度时，pyr烯基衍生物易于形成分子内准分子，而咔唑基衍生物未显示出准分子的证据。各向同性和有序固体基质中10〜（-3）至10〜（-2）M的pyr烯基和咔唑基衍生物都主要表现出单体发射。在纯净的薄膜中，分子间的准分子主要存在于pyr基衍生物中，而咔唑基衍生物也显示出单体发射的证据。将咔唑基衍生物与聚（N-乙烯基咔唑）区分开的一个特征是薄膜荧光光谱中观察到的精细结构。用圆偏振荧光光谱法测定表征pyr基和咔唑基侧基与胆甾型主体的螺旋排列的有序参数。结果表明排列吡啶基的相对容易，大概是由于更有利的区域化学和构象柔韧性。

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