Abstract
Reactions of labile [MCl 3(PPh 3) 2(NCMe)] (M = Tc, Re) precursors with 1 H-benzoimidazole-2-thiol (H 2L 1), 5-methyl-1 H-benzoimidazole-2-thiol (H 2L 2) and 1 H-imidazole-2-thiol (H 2L 3), in the presence of PPh 3 and [AsPh 4]Cl gave a new series of trigonal bipyramidal M(III) complexes [AsPh 4]{[M(PPh 3)Cl(H 2L 1–3) 3]Cl 3} (M = Re, 1– 3; M = Tc, 4– 6). The molecular structures of 1 and 3 were determined by X-ray diffraction. When the reactions were carried out with benzothiazole-2-thiol (HL 4) and benzoxazole-2-thiol (HL 5), neutral paramagnetic monosubstituted M(III) complexes [M(PPh 3) 2Cl 2(L 4,5)] (M = Re, 8, 9; M = Tc, 10, 11) were obtained. In these compounds, the central metal ions adopt an octahedral coordination geometry as authenticated by single crystal X-ray diffraction analysis of 8 and 11. Rhenium and technetium complexes 1, 4 and rhenium chelate compounds 8, 9 have been also synthesized by reduction of [MO 4] − with PPh 3 and HCl in the presence of the appropriate ligand. All the complexes were characterized by elemental analyses, FTIR and NMR spectroscopy.
Published Version
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