Probing second-sphere hydrogen-bonding interactions in metal complexes with time-resolved photoacoustic

C.D. Borsarelli

doi:doi:10.1051/jp4:2005125004

Issue		J. Phys. IV France Volume 125, June 2005


Page(s)		15 - 17
DOI		https://doi.org/10.1051/jp4:2005125004

J. Phys. IV France 125 (2005) 15-17
DOI: 10.1051/jp4:2005125004

Probing second-sphere hydrogen-bonding interactions in metal complexes with time-resolved photoacoustic

C.D. Borsarelli

Instituto de Ciencias Químicas, Universidad Nacional de Santiago del Estero, Av. Belgrano (S) 1912, 4200 Santiago del Estero, Argentina

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Abstract
Depending on the Lewis acid-base properties of the ligand moiety and the surrounding molecules, some coordination metal complexes can interact with the solvent molecules through second-sphere donor-acceptor (SSDA) interactions. In aqueous media, hydrogen bonding governs the solute-solvent interactions. In this report, the enthalpy content, $\delta$ H $_{\rm MLCT}$ , and the structural volume change, $\delta$ V $_{\rm MLCT}$ , associated with the formation and decay of the metal-to-ligand charge-transfer triplet state (³MLCT) of ruthenium (II) bipyridine cyano complexes were determined using time-resolved photoacoustics (TRP), in water, water pools of reverse micelles, and in the presence of polyammonium macrocycle [32]ane-[N₈H₈]⁸⁺, for the formation of supercomplexes. The results are explained as function of the structure and properties of the hydrogen-bonding interactions between the metal complexes and the surrounding molecules.