Preparation and X-ray crystal structure study of a polypyridyl ruthenium(II) complex containing a dehydrodithizone ligand
Coordination of 2,3-diphenyltetrazolium-5-thiolate (tet) to an Ru(trpy)(bpy)(OH2)2 (trpy=2,2′:6′,2″-terpyridine; bpy=2,2′-bipyridine) centre resulted in the formation of [Ru(trpy)(bpy) (tet)](ClO4)2. Single-crystal X-ray analysis revealed that the tet ligand is bound through the sulfur atom to a somewhat distorted-octahedral ruthenium centre. The Ru-S bond distance is 2.393(2) Å, and the Ru-S-C bond angle is 115.1(2)°; the tet N-N bonded distances [1.306(10) Å-1.316(9) Å] are essentially equal. These data, as well as spectroscopic and electrochemical evidence, suggest that the tetrazolium ring exhibits delocalized, mesoionic character with some thiolate character on the sulfur atom.
Walsh, JL; McCracken, R; McPhail, AT
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