Solvent dependence of charge-transfer transitions in binary aqueous mixtures as an indicator of preferential solvation |
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| Authors: | Amalia Rodriguez Francisco Sánchez Miría Luisa Moyá John Burgess Ahmed Al-Alousy |
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| Institution: | (1) Departmento de Química Física, Universidad de Sevilla, Profesor García González s/n, 41012 Sevilla, Spain;(2) Department of Chemistry, University of Leicester, Leicester, UK |
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| Abstract: | Summary Wavelengths of maximum absorptions are reported for the main metal-to-ligand charge transfer-bands (MLCT) of complexes Fe(CN)5(4-phpy)]3– and Fe(CN)5(4-t-bupy)]3– (4-phpy=4-phenylpyridine and 4-t-bupy=4-t-butylpyridine) in several series of mixed solvents. Correlations of the shifts in MLCT energies as a function of dielectric constant and polarizability of the medium have been investigated. The interpretation of the medium effects on Eop (MLCT) takes into account the process of preferential solvation of solutes by solvent molecules. |
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