Synthesis, 119Sn Mössbauer spectroscopic studies and X-ray crystal structure determination of new seven-coordinate diorganotin(IV) complexes with S,N,N,N,S-pentadentate Schiff bases derived from 2,6-diacetylpyridine of S-methyl- and S-benzyldithiocarbazates

The reactions of the ligands 2,6-diacetylpyridine bis(S-methyldithiocarbazate)] (H2dapmdtc) and 2,6-diacetylpyridine bis(S-benzyldithiocarbazate)] (H2dapbdtc) with R4-mSnClm(R = Me, nBu, Ph; and m= 2) led to the formation of six seven-coordinate diorganotin(IV) complexes, which were studied by microanalysis, i.r., n.m.r (1H, 119Sn) and Mössbauer spectroscopies. The X-ray structures determination of complexes [Me2Sn(dapmdtc)], [Me2Sn(dapbdtc)] and [Ph2Sn(dapbdtc)] revealed the presence of neutral seven-coordinated complexes. The structures consist of monomeric units in which the Sn(IV) atom exhibits distorted pentagonal bipyramidal (PBP) geometry, with the S,N,N,N,S-donor systems of the ligands lying in the equatorial plane and organic groups in the apical positions. A correlation between Mössbauer and X-ray data based on the point-charge model is discussed.The reactions of the ligands 2,6-diacetylpyridine bis(S-methyldithiocarbazate)] (H2dapmdtc) and 2,6-diacetylpyridine bis(S-benzyldithiocarbazate)] (H2dapbdtc) with R4-mSnClm(R = Me, nBu, Ph; and m= 2) led to the formation of six seven-coordinate diorganotin(IV) complexes, which were studied by microanalysis, i.r., n.m.r (1H, 119Sn) and Mössbauer spectroscopies. The X-ray structures determination of complexes [Me2Sn(dapmdtc)], [Me2Sn(dapbdtc)] and [Ph2Sn(dapbdtc)] revealed the presence of neutral seven-coordinated complexes. The structures consist of monomeric units in which the Sn(IV) atom exhibits distorted pentagonal bipyramidal (PBP) geometry, with the S,N,N,N,S-donor systems of the ligands lying in the equatorial plane and organic groups in the apical positions. A correlation between Mössbauer and X-ray data based on the point-charge model is discussed.