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

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Kawski A., Kubicki A.

Acta Physica Polonica A

1991

vol. 79

issue 4

457-470

The electric dipole moments μ_{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 μ_{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(CH_{3})_{2} in position 4 and different acceptors R' in position 4', the enhancing electron properties of the acceptor are accompanied by the increase in μ_{g} - the dipole moment in the ground state, and μ_{e} - the dipole moment in the excited state. There exists a linear relation between the values of μ_{e} and μ_{g}.

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1 Acta Physica Polonica A

1 1991

1 Kawski A.

1 Kubicki A.

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