Fluorescence and photophysical properties of D-π-A push-pull systems featuring a 4,5-dicyanoimidazole unit

Absorption and fluorescence spectra and fluorescence quantum yields of 18 D-;pi-A push-pull compounds were measured. The investigated chromophores consist of 4,5-dicyanoimidazole - bearing donor - substituted and systematically extended it-conjugated spacers. The influence of temperature and solvent polarity on the spectral and photophysical properties was investigated. Employing INDO/S calculations, the structure property relationships were discussed. (C) 2011 Elsevier Ltd. All rights reserved.