Olaniran Atchade -      Synthesis, spectroscopic and structural characterization of diphenyltin(IV) complexes of acetone Schiff bases of S-alkyldithiocarbazates

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      Publication Details (including relevant citation   information):

      M. A. Ali, A. H. Mirza, M. H. S. A. Hamid, P. V. Bernhardt, O.   Atchade, X. Song, G. Eng, L. May, Polyhedron,   27, 977-984 (2008)


      New diphenyltin(IV) complexes of empirical formula,   [Sn(C6H5)2(NS)CI] (NS = anionic   forms of the acetone Schiff bases of S-methyl or   S-benzyldithiocarbazate) have been prepared and characterized by   IR, NMR and Mössbauer spectroscopic techniques. The crystal and   molecular structures of the acetone Schiff bases of   S-methyldithiocarbazate (Hacsme) and S-benzyldithiocarbazate   (Hacsbz) and their tin(IV) complexes have been determined by   X-ray diffraction. In the solid state, both the Schiff bases   exist in their thioketo tautomeric forms with the azomethine   nitrogen atom trans to the thione sulfur atom but in the   tin(IV) complexes they are present in their deprotonated   ene-thiolate forms being coordinated to the tin atom as bidentate   chelating agents via the azomethine nitrogen and   thiolate sulfur atoms. The tin atom adopts a five-coordinate,   approximately trigonal bipyramidal geometry, with the tiolate   sulfur atom of the Schiff base and the two phenyl groups   occupying the equatorial positions. The azomethine nitrogen atom   and the chlorine ligand occupy axial positions. The distortion   from a regular trigonal bipyramidal or a square-pyramidal   geometry is attributed to the restricted bite sizes of the   five-membered chelate rings.

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