Excited-state charge coupled proton transfer reaction via the dipolar functionality of salicylideneaniline
作者:Tzu-Chien Fang、Hsing-Yang Tsai、Ming-Hui Luo、Che-Wei Chang、Kew-Yu Chen
DOI:10.1016/j.cclet.2013.01.011
日期:2013.2
Based on design and synthesis of salicylideneaniline derivatives (1a-1d), we demonstrate a prototypical system to investigate the excited-state intramolecular charge transfer (ESICT) coupled excited-state intramolecular proton transfer (ESIPT) reaction via the dipolar functionality of the molecular framework. In solid and aprotic solvents 1a-1d exist mainly as E conformers that possess an intramolecular six-membered-ring hydrogen bond. Compounds 1a-1c exhibit a unique proton-transfer tautomer emission, while compound 1d exhibits remarkable dual emission due to the different solvent-polarity environment between ESICT and ESIPT states. Time-dependent density functional theory (TDDFT) calculations are reported on these Schiff bases in order to rationalize their electronic structure and absorption spectra. (C) 2013 Kew-Yu Chen. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.