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

Abstract

The reactions of the ligands 2,6-diacetylpyridine bis(S-methyldithiocarbazate)] (H 2 dapmdtc) and 2,6-diacetylpyridine bis(S-benzyldithiocarbazate)] (H 2 dapbdtc) with R 4-m SnCl m (R = Me, n Bu, 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 ( 1 H, 119 Sn) and Mo¨ssbauer spectroscopies. The X-ray structures determination of complexes [Me 2 Sn(dapmdtc)], [Me 2 Sn(dapbdtc)] and [Ph 2 Sn(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 Mo¨ssbauer and X-ray data based on the point-charge model is discussed.

Chemistry and applications of organotin(iv) complexes of Schiff bases

“…40-42,57,59,68,83,85,86,96, 106 The lack of a downfield shift in position of the signal attributable to S-CH 3 (d 2.59 ppm in free ligand) suggested little or no participation of the C S group in bonding. 59, 133 The 1 H NMR spectra of SnMe 2 Cl 2 (H 2 cdsalen) and SnMe 2 Cl 2 (Hcdacacen) showed singlets at d 1.22 and 1.21 ppm (6H) for CH 3 -Sn, and the observed 2 J( 119 Sn-1 H) value (71.0/76.5 Hz) 57, 59 is typical of a penta-coordinated dimethyltin(IV) complex. Substitution of the 2 J( 59 Similar results have been reported for other diorganotin(IV) complexes of tridentate ONO donor Schiff bases.…”

Studies on Coordination Chemistry and Antibacterial Activity of Bidentate NS Schiff Base Derived From SBDTC and 4-Benzyloxybenzaldehyde

“…Free dithiocarbazaic acid and its S-benzyl esters behave typically as NS donorswith formation of a five-membered chelate ring [14,18,19], but SS coordination was also observed making a four-membered chelate ring [19]. However, a change of suitable groups at hydrazine moiety of these compounds can modify the donor sequence of such ligands giving rise to different coordination geometries [2,[20][21][22][23]. The present work represents the coordination behavior of S-benzyl-β-N-(4-benzyloxyphenyl) methylene hydrazine carbodithioate with some transition metal ions and study of their antibacterial activities.…”