Synthesis of mono- and binuclear dioxomolybdenum(VI) complexes derived from N(4)-substituted thiosemicarbazones: X-ray crystal structures of [(MoO 2L 1) 2], [MoO 2L 1py] and [MoO 2L 2py

Abstract

Four molybdenum(VI) thiosemicarbazonato complexes have been synthesized and characterized. The dinuclear complexes [(MoO 2L 1) 2] ( 1) and [(MoO 2L 2) 2] ( 3) have been prepared by the reaction of [MoO 2(acac) 2] with 2-hydroxyacetophenone N(4)-cyclohexyl (H 2L 1) and N(4)-phenyl (H 2L 2) thiosemicarbazones in alcoholic medium. Mononuclear dioxomolybdenum(VI) complexes of the type [MoO 2L 1py] ( 2) and [MoO 2L 2py] ( 4) have been prepared by the reaction of 1 or 3 with pyridine (py) in alcoholic medium. In all the complexes, molybdenum is coordinated by two terminal oxo-oxygen atoms, (O t), oxygen, nitrogen and sulfur atoms from the principal ligand and by an oxygen atom from the second unit in 1, and by a nitrogen atom from pyridine in complexes 2 and 4. All complexes have been spectroscopically characterized. The molecular structures of complexes 1, 2 and 4 have been determined by the single crystal X-ray diffraction method.