EFFECT OF MEDIUM ON THE ELECTRONIC-SPECTRA OF 2-NITROANILINE DERIVATIVES

The wavenumbers of the long-wavelength absorption band were measured f or nine 4-substituted and 5-substituted derivatives of 2-nitroaniline in the gaseous state and in 13 solvents where only nonspecific solvent -solute interactions can be expected. For the series involving all the solvents used, the solvent effects can be well expressed by an one-pa rameter equation involving the product of the Born functions of the re lative permittivity and of the refractive index of the solvent. For th e series involving the nonpolar solvents and the gaseous state only, t his equation reduces to an one-parameter equation involving the refrac tive index Born function squared.