Organotin(IV) Derivatives of 2-Acetylpyridine-N(4)-Phenylthiosemicarbazone, HAP4P, and 2-Hydroxyacetophenone-N(4)-Phenylthiosemicarbazone, H2DAP4P: Crystal and Molecular Structure of [SnMe2(DAP4P)] and [SnBu2(DAP4P)]

the reactions of 2-acetylpyridine-n(4)-phenylthiosemicarbazone, hap4p, and 2-hydroxyacetophenone-n(4)-phenylthiosemicarbazone, h2dap4p, with r4-msnxm (m = 2, 3; r = me, nbu, ph and x = cl, br) led to the formation of hexa- and penta-coordinated organotin(iv) complexes, which were studied by microanalysis, ir, 1h-nmr and m？ssbauer spectroscopies. the molecular structures of [snme2(dap4p)] and [snnbu2(dap4p)] were determined by single-crystal x-ray diffraction studies. in the compounds [snclme2(ap4p)] and [snbrme2(ap4p)], the deprotonated ligand ap4p- is n,n,s-bonded to the sn(iv) atoms, which exhibit strongly distorted octahedral coordination. the structures of [snme2(dap4p)] and [snnbu2(dap4p)] revealed that the dap4p2- anion acts as a o,n,s-tridentate ligand. in these cases, the sn(iv) atoms adopt a strongly distorted trigonal bipyramidal configuration where the azomethine n and the two c atoms are on the equatorial plane while the o and the s atoms occupy the axial positions.