A new generalized spectral luminescent method for determining dipole moments of molecules in the ground and excited states

An original spectral luminescent method for determining dipole moments of molecules in the ground and excited states was proposed, and its preliminarily tests were made. It is based on a combined quantitative analysis of experimental data on the linear (solvation) and nonlinear (complex formation) components of the orientation shift of electronic and vibrational spectra of molecules in two-and three-component solutions. To realize the method in practice, one should make a series of standard measurements of the position of absorption bands or the stationary luminescence of diluted solutions of a substance under study in several rationally chosen liquid individual and binary solvents at the room temperature. The distinctive feature of the method is that it is based on the use of spectroscopic data only and does not require that the equilibrium value of the effective radius of the intermolecular interaction (Onsager radius of a molecule of a diluted substance) be specified and the angles between the moments of ground and excited states be known.