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1 Bulletin of the Polish Academy of Sciences. Chemistry

1 2003

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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.