High-Pressure Picosecond Time-Resolved Fluorescence Studies on the Excited Intramolecular Charge-Transfer Kinetics of 4-(9-Anthrylmethyl)-N,N-Dimethylaniline in Alcohol

Berichte der Bunsengesellschaft für physikalische Chemie Pub Date : 2014-03-18 DOI:10.1002/bbpc.199700005

Kimihiko Hara, Dmitry S. Bulgarevich, Okitsugu Kajimoto

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Abstract

Picosecond time-resolved fluorescence spectroscopy has been used to examine the dynamic solvent effect on the excited intramolecular charge-transfer (ICT)-state formation in 4-(9-anthrylmethyl)-N,N-dimethylaniline (AMDMA) in linear alcohol solvents as a function of pressure. The non-exponential population decay of the local excited (LE)-state emission is analyzed by fitting to a double exponential function. As solvent viscosity increases, the rate of the ICT-state formation of AMDMA becomes noticeably faster than the solvent relaxation time, which is gauged by the longitudinal relaxation time of the solvent (τ_L). The pressure effect on the ICT reaction of AMDMA in the excited state can be accounted for in terms of the pressure-tuning effect of the solvent viscosity.

In addition, the time-dependent Stokes shift (TDSS) of the ICT emission is measured at high pressures.

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酒精中4-(9-蒽甲基)- n, n -二甲基苯胺分子内激发态电荷转移动力学的高压皮秒时间分辨荧光研究

采用皮秒时间分辨荧光光谱法研究了4-(9-蒽基甲基)- n, n -二甲基苯胺(AMDMA)在线性醇溶剂中分子内电荷转移(ICT)态形成的动力学溶剂效应与压力的关系。通过拟合双指数函数分析了局域激发态发射的非指数族衰减。随着溶剂粘度的增加，AMDMA的ict态形成速率明显快于溶剂弛豫时间，这是由溶剂的纵向弛豫时间(τL)来衡量的。压力对激发态下AMDMA ICT反应的影响可以用溶剂粘度的压力调节效应来解释。此外，在高压下测量了ICT发射的时相关斯托克斯位移(TDSS)。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Berichte der Bunsengesellschaft für physikalische Chemie

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