NEW HEPTACOORDINATED TIN COMPLEXES OF 2,6-DIACETYLPYRIDINE-BIS(THIOSEMICARBAZONE), H2DAPTSC, AND OF 2,6-DIACETYLPYRIDINE-BIS(SEMICARBAZONE), H2DAPSC - CRYSTAL AND MOLECULAR-STRUCTURES OF [MESNCL(HDAPTSC)]CL.MEOH AND [MESNCL(H2DAPSC)]CL2.2H2O

Two new heptacoordinated organotin complexes, [MeSnCl(Hdaptsc)]Cl.MeOH (1) and MeSnCl(H2dapsc)]Cl2.2H2O (2), have been prepared from MeSnCl3 and H-2daptsc and H-2dapsc, respectively. Single crystal X-ray diffraction studies showed them to be approximately pentagonal bipyramidal (PBP), with the organic ligands lying in the equatorial plane. H-2daptsc and SnCl4 form a complex with the formula [ClSnCl(Hdaptsc)]Cl (3), which is presumed to have an analogous PBP structure. On the other hand, the complex obtained from H-2dapsc and Me2SnCl2 is tentatively formulated as [(Me2SnCl2)2(H2dapsc)] (4), and Sn-119 Mossbauer spectroscopic evidence suggests an octahedral coordination for the two tin atoms.