engleski

Synthesis of five new molybdenum(VI) thiosemicarbazonato complexes. Crystal structures of salicylaldehyde and 3-methoxy-salicylaldehyde 4-methylthiosemicarbazones and their molybdenum(VI) complexes

Polynuclear [MoO2{;SalTSC-4-Me};]n (I), [MoO2{; VanTSC-4-Me};]n (II) and mononuclear [MoO2{;SalTSC-4-Me};(CH3OH)] (1a), [MoO2{; VanTSC-4-Me};(CH3OH)] (2a) and [MoO2{;VanTSC-4-Me};(H2O)] × CH3CN (2b) complexes have been prepared by the reaction of the [MoO2(acac)2] (acetylacetonate ligand, acac
, C5H7O2
) with 1 (salicylaldehyde 4-methylthiosemicarbazone ligand, C6H4(OH)CH:NNC(SH)NHCH3H2SalTSC-4-Me) or 2 (3-methoxy-salicylaldehyde 4-methylthiosemicarbazone, CH3OC6H3(OH)- CH:NNC(SH)NHCH3, H2VanTSC-4-Me) in acetonitrile or in dry methanol. All complexes have been characterized by means of chemical analyses, thermogravimetric analyses, IR spectroscopy and some of them by 1H, 13C NMR spectroscopy and X-ray crystallography. In all mononuclear complexes molybdenum atom is coordinated by two terminal oxo-oxygen atoms, by ONS atoms from the ligand molecule and by an oxygen atom from methanol (in 1a and 2a) or water (in 2b) molecules. Ligands 1 and 2 have been characterized by means of 1H, 13C NMR spectroscopy and X-ray crystallography. Molecules of both ligands are found to be in the thioketo tautomeric form.

molybdenum(VI) complexes; thiosemicarbazones; mononuclear and polynuclear complexes; tridentate ligands; crystal structures

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