Anisotropic Fluorescence of Polar Molecules in External Electric Field, Dipole Moments of Para-Disubstituted Transstilbenes in the First Excited Singlet State
A. Kawski and A. Kubicki
Luminescence Research Group, Institute of Experimental Physics, University of Gdańsk, Wita Stwosza 57, 80-952 Gdańsk, Poland
Received: June 19, 1990
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The electric dipole moments μe in the lowest excited singlet state of nine short-lived para-disubstituted trans-stilbenes were determined experimentally based on the effect of the external electric field on the fluorescence anisotropy. The values of μe obtained from Liptay's theory with the employment of the Onsager effective field are in satisfactory agreement with those calculated based on the solvatochromic effect. In the case of para-substituted trans-stilbenes with the same donor substituent R = N(CH3)2 in position 4 and different acceptors R' in position 4', the enhancing electron properties of the acceptor are accompanied by the increase in μg - the dipole moment in the ground state, and μe - the dipole moment in the excited state. There exists a linear relation between the values of μe and μg.
DOI: 10.12693/APhysPolA.79.457
PACS numbers: 33.50.-j