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The electric dipole moments mu-e 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 mu-e 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 mu-g-the dipole moment in the ground state, and mu-e-the dipole moment in the excited state. There exists a linear relation between the values of mu-e and mu-g.

acta physica polonica. a

Anisotropic Fluorescence of Polar Molecules in External Electric Field, Dipole Moments of Para-Disubstituted Transstilbenes in the First Excited Singlet State