Abstract
Binding interactions of ruthenium(II) ..cap alpha..-diimine photosensitizers with ..beta..-cyclodextrin (CD) were studied in aqueous solution by using an excited-state lifetime method. Only complexes possessing phenyl-substituted ligands exhibited significant interaction with CD. Binding occurred via inclusion of the phenyl group in the CD cavity. Multiple binding was observed in deaerated solution for those complexes containing more than one phenyl substituent. Lifetime vs. CD concentration titrations were successfully described by a simple model. Binding of CD to the Ru(II) complexes shields the complexes from the oxygen quenching. Shielding increases as the number of bound CD's increases. Solvent exposure parameters are shown to provide information on both solvent accessibility and sensitizer-CD interactions in the inclusion complex.
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