Publication Details (including relevant citation information):
Lopez-Torres, E, Calatayud, D G, Pastor, C J, Mendiola, M A Polyhedron 2008 27 (12) 2507-2512
Abstract: The differences in the reactivity of diphenyllead and diphenyltin dichloride with benzil bis(thiosemicarbazone) LH6 are explored. The reaction of PbPh2Cl2 afforded the complex [Pb(LH4)] 1, containing the ligand doubly deprotonated and without the phenyl groups bonded to the metal. The reaction with SnPh2Cl2 in the absence of solvent yielded the complex [Sn(LH4)Cl2] 2. The lead(II) complex, also obtained by the reaction with lead(II) nitrate, was formed by a redistribution of the organolead derivative followed by a reductive elimination reaction, while the tin one was formed by a dephenylation process. Reactions in solution of the organotin derivative are complicated and depending on the working conditions different compounds could be isolated: the organostannoxane [Sn2Ph4ClO(OH)]2, which was confirmed by X-ray crystallography, or a complex containing a triazine-3-thione ligand, formed by the loss of one of the thiosemicarbazone arms with subsequent cyclisation. The compounds were characterized by IR, mass spectrometry, 1H, 13C and 119Sn NMR spectroscopy in solution and in the solid state. The structure of [Pb(LH4)] has been studied by X-ray diffraction and the ligand acts as a N2S2 planar bideprotonated ligand, with the lead(II) ion localized 1.3858 Å over this plane.
Address (URL): ISI:000258616400001