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Photoinduced Ligand Isomerization in Dimethyl Sulfoxide Complexes of Ruthenium(II)
Author(s) -
Smith Matthew K.,
Gibson John A.,
Young Charles G.,
Broomhead John A.,
Junk Peter C.,
Keene F. Richard
Publication year - 2000
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/(sici)1099-0682(200006)2000:6<1365::aid-ejic1365>3.0.co;2-z
Subject(s) - chemistry , ruthenium , isomerization , sulfoxide , dimethyl sulfoxide , photochemistry , intermolecular force , ligand (biochemistry) , linkage isomerism , molecule , catalysis , metal , organic chemistry , biochemistry , receptor
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 photo‐promoted linkage isomerization of the DMSO ligands from S ‐to 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 X‐ray crystallographic studies of cis ‐[Ru(bpy) 2 (DMSO) 2 ](CF 3 SO 3 ) 2 .