Photoinduced ligand isomerization in Dimethyl Sulfoxide Complexes of Ruthenium(II)

Journal Publication ResearchOnline@JCU
Smith, Matthew K.;Gibson, John A.;Young, Charles G.;Broomhead, John A.;Junk, Peter C.;Keene, F. Richard
Peter Junk
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.

Journal

European Journal of Inorganic Chemistry

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Volume

2000

ISBN/ISSN

1099-0682

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Issue

6

Pages Count

6

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Publisher

Wiley-Blackwell

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EISSN

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DOI

10.1002/(SICI)1099-0682(200006)2000:6<1365::AID-EJIC1365>3.0.CO;2-Z