J. Phys. IV France
Volume 125, June 2005
Page(s) 15 - 17

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

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.

© EDP Sciences 2005