Two isomers of [1-benzyl-4-(pyridin-2-yl-κN)-1H-1,2,3-triazole-κN (3)]di-chlorido-bis-(dimethyl sulfoxide-κS)ruthenium(II).

The structures of two isomers of the title compound, [RuCl(2)(C(14)H(12)N(4))(C(2)H(6)OS)(2)], 2 and 3, are reported. Isomers 2 and 3 are produced by reaction of the pyridyl-triazole ligand 1-benzyl-4-(pyridin-2-yl)-1H-1,2,3-triazole (bpt) (1) with fac-[RuCl(2)(DMSO-S)(3)(DMSO-O)]. Reaction in acetone produces ca 95% 2, which is the OC-6-14 isomer, with cis DMSO and trans chlorido ligands, and 5% 3 (the OC-6-32 isomer, with cis DMSO and cis chlorido ligands, and the pyridyl moiety of bpt trans to DMSO). Reaction in refluxing toluene initially forms 2, which slowly isomerizes to 3.