Abstract

The solvent-shift method was used to determine dipole moment changes on electronic excitation in pseudoazulenes, derivatives of 7-azaindole. The dipole moment is reduced, and in S 1 its direction is opposite to that of the ground state. The appropriate value of the Onsager radius corresponds to the chromophore part only: the chromophore and the substituent process their own Onsager cavities.

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