Abstract
Absorption band maxima of pyridinium- N-phenoxide betaine-30 [C. Reichardt, Chem. Rev. 94 (1994) 2319] are investigated as a function of refractive index and static permittivity of solvents. Spectral shift components due to dispersive forces and solvent polarization were separated, revealing a large increase of polarizability from 70 Å 3 in the ground state to ∼200 Å 3 in the excited state. Optical band maximum of the nonsolvated chromophore in vacuum is predicted by extrapolation to lie at 40.3 ± 2 kcal/mol, close to the E T(30) value in methyl acetate (38.9 kcal/mol). The contributions of repulsive, dispersive, inductive, and reaction field effects are discussed.
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