Synthesis and spectroscopic studies of ruthenium(II) selenoether complexes: Structure oftrans-[Ru&{PhSe(CH2)2SePh}2Cl2]

The complexestrans-[Ru(L L)2X2][X = Cl, Br or I; L L = bidentate ligand including PhSe(CH2)2SePh, MeSe(CH2)2SeMe ando-C6H4(TeMe)2] have been prepared by reaction of RuCl3·xH2O and LiX with the ligand in alcoholic solvents in the presence of a reducing agent. The complexes have been characterized by analysis, IR, UV-vis and77Se or125Te NMR spectroscopies and the RuII-RuIII redox potentials established by cyclic voltammetry. The crystal structure oftrans-[Ru{PhSe(CH2)2SePh}2Cl2] has been determined, giving Ru Cl 2.413(1), 2.444(1), Ru Se 2.433(1)-2.460(1)A˚.