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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Proton transfer assisted charge transfer phenomena in photochromic schiff bases and effect of -NEt_2 groups to the anil schiff bases
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Proton transfer assisted charge transfer phenomena in photochromic schiff bases and effect of -NEt_2 groups to the anil schiff bases

机译：光致变色席夫碱中的质子转移辅助电荷转移现象和-NEt_2基团对茴香席夫碱的影响

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摘要

Photochromic Schiff bases 5-diethylamino-2-[(4-diethylamino-benzylidene)- hydrazonomethyl]-phenol (DDBHP) and N,N′-bis(4-N,N- diethylaminosalisalidene) hydrazine (DEASH) with both the proton and charge transfer moieties have been synthesized, and their photophysical properties such as excited state intramolecular charge transfer (ICT) and proton transfer (ESIPT) processes have been reported on the basis of steady-state and time-resolved spectral measurement in various solvents. The ground-state six-membered intramolecular hydrogen bonding network at the proton transfer site accelerates the ESIPT process for these compounds. Both the compounds show large Stokes-shifted emission bands for proton transfer and charge transfer processes. The hydrogen bonding solvents play a crucial role in these photophysical processes. Excited-state dipole moment of DDBHP and DEASH calculated by the solvatochromic method supports the polar character of the charge transfer excited state. Introduction of -NEt2 groups to the reported salicylaldehyde azine (SAA) Schiff base results an increase in fluorescence lifetime from femtosecond to picosecond time scale for the proton transfer process.
机译：Schiff碱光致变色Schiff碱具有质子和质子的5-二乙基氨基-2-[（4-二乙基氨基-亚苄基）-肼基甲基]苯酚（DDBHP）和N，N'-双（4-N，N-二乙基氨基水杨烯基）肼（DEASH）已经合成了电荷转移部分，并且基于在各种溶剂中的稳态和时间分辨光谱测量，已经报道了它们的光物理性质，例如激发态分子内电荷转移（ICT）和质子转移（ESIPT）过程。质子转移位点的基态六元分子内氢键网络加快了这些化合物的ESIPT过程。两种化合物在质子转移和电荷转移过程中均显示出较大的斯托克斯位移发射带。氢键溶剂在这些光物理过程中起着至关重要的作用。通过溶剂变色法计算的DDBHP和DEASH的激发态偶极矩支持电荷转移激发态的极性。将-NEt2基团引入已报道的水杨醛嗪（SAA）Schiff碱会导致质子转移过程的荧光寿命从飞秒到皮秒的时间范围增加。

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