Merocyanine 540 (M540) is famous dye that used in electronics and medicine. An important feature of the dye is a significant intramolecular transfer of the electron density in the excited state. Experimentally was investigated the electronic absorption and fluorescence spectra in different solvents M540. Electronic structure, spectra and rate constants of photo-physical processes of an isolated molecule and its complexes with water molecules were calculated by INDO method with spectroscopic parameterization. Analysis of the results allowed establishing the effect of individual fragments and hydrogen bonds with water on the electronic charge transfer between the terminal units in the state S₁. Examination of photo-physical processes of decomposition of the fluorescent state was showed that the intramolecular processes of decay of the S₁ state are not the cause of the differences calculated and experimental fluorescence quantum yield. Consideration of trans-cis photoisomerization leads to the elimination of this non-compliance.

Date Published: 15 December 2015
PDF: 7 pages
Proc. SPIE 9810, International Conference on Atomic and Molecular Pulsed Lasers XII, 98100B (15 December 2015); doi: 10.1117/12.2224693

Published in SPIE Proceedings Vol. 9810:
International Conference on Atomic and Molecular Pulsed Lasers XII
Victor F. Tarasenko; Andrey M. Kabanov; Andrey M. Kabanov, Editor(s)