1980 年 49 巻 4 号 p. 1505-1512
We assume such a model for retinylidene iminium salt in solution that retinylidene iminium cation interacts not only with its counter anion X− but also with the local field E due to solvent molecules. On the basis of the model, the π-electronic states of the cation are calculated by our previous LCAO–ASMO–SCF–CI method, assuming that X− is a negative point-charge in the plane of the π-system and E is a reaction field acting on the salt dipole moment in a spherical cavity.
It is thus shown that the observed wavelength λmax of absorption maximum of the salt in solution can be explained with a reasonable choice of both the distance R of X− from N16+ and the radius a of the cavity. It is also shown that the λmax decreases with decreasing R while it steeply increases to reach a saturated value as the dielectric constant ε of solvent increases.
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