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Synthesis, Characterization and Kinetics of Metal Complexes Containing Dithiocarbamate and Polypyridine

Rafat R., Siddigi K., Siddiqi M.

Polish Journal of Chemistry

2007

Vol. 81, nr 3

313-326

Complexes of the type [M(L)(ddtc)2], where M = Mn(II), Co(II), Ni(II), Cu(II) and Zn(II), L = 2,2'-bipyridine or 1,10-phenanthroline and ddtc = diethyldithiocarbamate, have been synthesized and characterized by elemental analyses, IR, electronic, EPR, 1H NMR spectral data, magnetic moment and conductivity measurements. The electrical conductivity of the complexes indicated them to be non-electrolyte in nitrobenzene. The spectroscopic evidences suggest that the complexes have an octahedral environment around the metal ion. Plot of log [Delta/Delta-Delta m] against time was linear suggesting first order kinetics of nuceophilic substitution of [Ni(bpy)(ddtc)2] by chloride ion in nitrobenzene. The results show that the rate of substitution is independent of the concentration of the nucleophile and depends only on the first power of the concentration of the complex.

Dinuclear polypyridine complexes of 2,4,6-tris(2-pyridyl)-1,3,5-triazine: mixed ligand Ni(II), Co(II) and Cu(II) complexes containing dithiooxamide and thiosemicarbazide

Ibrahim S. A., Hammam A. M., El-Gahami M. A., Fouad D. M.

Bulletin of the Polish Academy of Sciences. Chemistry

2003

Vol. 51, No. 2

93-103

A series of novel dinuclear mixed-ligand complexes having the general formula [M(2)(tpt)(L)(4]Cl(4)nH(2)O where M = Ni(II), Co(II) or Cu(II); tpt = 2,4,6-tris(2-pyridyl)-l,3,5-triazine; L = dithiooxamide (dto) or thiosemicarbazide (tsc); n = 2 — 4, have been synthesized and characterized. The tpt molecule is flexidentate, where it can behave as di- or tridentate and either mono- or dinucleating ligand. The coordination mode of the tpt to the M(II) apparently occurs through pyridyl and a triazine nitrogen atoms. The binary complexes have the formulas [Co(2)(tpt)Cl4H(2)O].2H(2)O, [Ni(tpt)Cl]Cl.5.5H(2)O and [Cu(tpt)Cl(2)].3H(2)O. All the mixed-ligand complexes are dinuclear with bridging tpt molecule and having an octahedral structure. Binary Co(II) and Cu(II) complexes are probably penta coordinated. The complexes under study were characterized by chemical analysis, spectral, molar conductance and thermal studies.