Solvent e †ects on the electronic spectra of dicyanobis(1,10-phenanthroline)iron(II) have been investigated in thirteen pure solvents and twenty binary solvent mixtures. In pure solvents, the shifts of the values are found to depend l max on more than one of the known solvent parameters (AN, a, b, DN and n*). AN, a and n* are found to be the most important solvent parameters, exerting a considerable e †ect on the solvatochromic shifts of the title complex. The preferential solvation of dicyanobis(1,10-phenanthroline)iron(II) in binary solvent mixtures has been investigated by monitoring the metalÈligand charge transfer band of the indicator complex. Organic solvents are preferred near the indicator complex in aqueous binary solvent mixtures (negative deviation), except in regions rich in MeCN, and 1,4-dioxane, where water molecules are preferred over the organic component (dual behavior). Me 2 CO However, the indicator complex is preferentially solvated by the component which has the higher acceptor number in non-aqueous binary solvent mixtures. Negative deviation was observed in binary mixtures of and CHCl 3 with alcohols and positive deviation in mixtures of with THF, DMSO and Di †erent Me 2 CO CHCl 3 Me 2 CO. criteria were considered to evaluate the extent of preferential solvation in di †erent solvent mixtures, viz., the local molar fraction the excess function (*X), the iso-solvation point and the preferential solvation constant (X A L), (X B iso) The preferential solvation data have been linearly correlated with the di †erent solvent parameters.

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