Synthesis, Characterization and Structural Studies of New (N3S2) Schiff Base Ligand and Its Coordination Complexes with Some Metal Ions.

J. Mohammed Al-Karawi, Ahmed

	Synthesis, Characterization and Structural Studies of New (N3S2) Schiff Base Ligand and Its Coordination Complexes with Some Metal Ions.
Al-Mustansiriyah Journal of Science
Article 1, Volume 20, Issue 1, 2009, Pages 14-29
Author
Ahmed J. Mohammed Al-Karawi
Abstract
New Schiff base pentadentate ligand with type (N3S2) has been prepared: 2,6-diacetylpyridine bis(4–methyl 3-thiosemicarbazone)(DAPMTSC). Synthesis was carried out by the condensation of 2,6-diacetylpyridine and 4-methyl 3-thiosemicarbazide in mole ratios of (1:1) and under nitrogen atmosphere. The ligand has been characterized and its structure was elucidated depending upon microelemental analysis (CHN), spectral data (I.R, U.V–Vis, 1H, 13CNMR and mass spectrum). Series of metal complexes of the ligand with metal ions such as CoII, NiII, CuII, ZnII and HgII have been synthesized by adding 1mmol of (DAPMTSC) to 1mmol of metal salts in methanol. The complexes were characterised and their stereochemical structures and geometries were suggested depending upon data of microelemental analysis (CHN), spectral studies (I.R, UV–Vis) , 1H ,13CNMR for [ZnII(DAPMTSC)] and 1HNMR for [HgII(DAPMTSC)], mass spectrum for [CoII(DAPMTSC)(H2O)] as well as magnetic moments and conductivity measurements. The following general formula were achieved: [M(DAPMTSC)(H2O)] where M = Co(II) , Ni(II) and Cu(II),and [M(DAPMTSC)] where M = Zn(II) and Hg(II) ions. The data of microelemental analysis suggested (1:1) (M:L) molar ratio. The NMR spectra of the complexes [ZnII(DAPMTSC)] and [HgII(DAPMTSC)] proved that bonding of metal ion occurred with thiol anions .The electronic spectra in DMF (10–3 M) supported by magnetic moments in solid state revealed octahedral geometries for the Co(II),Ni(II) and Cu(II) complexes, square- based pyramidal for Zn(II) and Hg(II) complexes. Conductivity measurements of the new synthesized complexes in DMF (10–3 M) showed the non electrolytic nature of all complexes

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