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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Formation and Anomalous Behavior of Aminonaphthalene-Cinnamonitrile Exciplexes
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Formation and Anomalous Behavior of Aminonaphthalene-Cinnamonitrile Exciplexes

机译：氨基萘-肉桂腈络合物的形成和异常行为

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摘要

The solvent dependence of the electronic spectra of several 1-aminonaphthalenes and 2-aminonaphthalenes in the absence and presence of two styrene derivatives, cinnamonitrile and 1-phenylpropene, has been investigated. The absorption maxima of the aminonaphthalenes are dependent upon both the polarity and hydrogen-bond donor and acceptor properties of the solvent and display both red and blue solvent shifts. The fluorescence maxima are more sensitive to solvent polarity than are the absorption maxima and display red shifts in both non-hydroxylic and hydroxylic solvents. The excited state dipole moments of the 1-amino-naphthalenes are larger than those of the 2-aminonaphthalenes. Quenching of the aminonaphthalene fluorescence by cinnamonitrile occurs with diffusion-controlled rates in all solvents, in accord with the occurrence of exergonic electron transfer. Exciplex fluorescence is observed only for the tertiary aminonaphthalenes in nonpolar solvents. The exciplex fluorescence displays anomalous temperature dependence in hexane solution, an increase in temperature resulting in blue-shifted exciplex fluorescence and an increase in the exciplex decay time. Quenching of the aminonaphthalene fluorescence by 1-phenylpropene is slower than diffusion-controlled and is not accompanied by exciplex fluorescence.
机译：研究了在不存在和存在两种苯乙烯衍生物肉桂腈和1-苯基丙烯的情况下，几种1-氨基萘和2-氨基萘的电子光谱对溶剂的依赖性。氨基萘的最大吸收量取决于溶剂的极性和氢键供体和受体的性质，并显示红色和蓝色溶剂转移。荧光最大值比吸收最大值更敏感于溶剂极性，并且在非羟基和羟基溶剂中均显示出红移。 1-氨基萘的激发态偶极矩大于2-氨基萘的激发态偶极矩。肉桂烯腈对氨基萘荧光的猝灭在所有溶剂中均以扩散控制的速率发生，这与能电子转移的发生一致。仅在非极性溶剂中的叔氨基萘中观察到激基荧光。激基复合物荧光在己烷溶液中显示出异常的温度依赖性，温度升高导致蓝移的激基复合物荧光和激基复合物衰减时间增加。 1-苯基丙烯对氨基萘荧光的猝灭比扩散控制要慢，并且不伴随有激基复合物荧光。

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