Excited state energy distributions in stereo selective white light emission of 1,2-dibenzthiazolyl ethylene isomers
摘要:
A detailed study on the influence of stereo specificity, which controls the photo emission characteristics of two dibenzthiazolyl ethylene (DBE) stereoisomers has been carried out using experimental time resolved measurements followed by a configuration interaction semi-empirical calculations. The differences in the photo emission effects are mainly governed by the intra-molecular steric effects, leading to the differences in solid-state packing order having a dihedral angle of phi similar to 40 degrees in cis form and phi similar to 177 degrees in the trans form, more importantly, differences in the intra-molecular electron density distribution causing 'charge redistribution' in the excited state. (C) 2009 Elsevier B.V. All rights reserved.