Experimental and theoretical determination of transition dipole moments of ethyl 5-(4-aminophenyl)- and 5-(4-dimethylaminophenyl)-3-amino-2,4-dicyanobenzoate
Institute of Experimental Physics, University of Gdansk, ul. Wita Stwosza 57, 80-052 Gdansk, Poland
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Received: 8 June 2013
Revised: 9 August 2013
Published online: 23 October 2013
The absorption and fluorescence transition dipole moments (ge and eg) for ethyl 5-(4-aminophenyl)-3-amino-2, 4-dicyanobenzoate (EAADCy) and ethyl 5-(4-dimethylaminophenyl)-3-amino-2, 4-dicyanobenzoate (EDMAADCy) have been determined on the basis of the steady-state and time-resolved spectroscopic measurements and semiempirical quantum-chemical calculations. The values of the transition dipole moments of perpendicular and flattened forms of the investigated molecules were estimated as a function of the solvent polarity. Noted differences between the absorption and emission transition dipole moments (i.e., ge/ge ≠ 1) confirm that the change of the electronic and molecular structure take place in the excited state.
© EDP Sciences, Springer-Verlag, 2013