Smith, Matthew K., Gibson, John A., Young, Charles G., Broomhead, John A., Junk, Peter C., and Keene, F. Richard (2000) Photoinduced ligand isomerization in Dimethyl Sulfoxide Complexes of Ruthenium(II). European Journal of Inorganic Chemistry, 2000 (6). pp. 1365-1370.

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Abstract

Upon exposure to sunlight or UV irradiation, a DMSO solution of [Ru(bpy)2(DMSO)2]2+ (1) (bpy = 2,2’-bipyridine; DMSO = dimethyl sulfoxide) turns rapidly from yellow to red, but subsequently slowly reverts to yellow in the dark. The photochemical sequence is explained in terms of a photopromoted linkage isomerization of the DMSO ligands from Sto O-bound, with a relaxation back to the thermodynamically stable yellow S-bound form in the dark by an intermolecular mechanism. The ‘‘dark’’ reaction has been studied by UV/Vis spectrophotometry, NMR and IR spectroscopy. The S-bound ligation of DMSO in the yellow cation was established by Xray crystallographic studies of cis-[Ru(bpy)2(DMSO)2]-(CF3SO3)2.

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