Abstract

F.A.O.Adekunle^*, B. Semire and O.A.Odunola

DOI : http://dx.doi.org/10.13005/ojc/290312

The dimeric complexes of Ru(phen)₂Cl₂.2H₂O and Ru(bipy)₂Cl₂.2H₂O prepared from the  condensation product obtained by reacting diacetyldihydrazone with 2- acetylpyridine (DDACP) was  characterized using microanalyses, infrared and UV-Vis spectra, ¹HNMR, mass spectra and the molar conductivity. The elemental analyses data and the mass spectra fragmentation patterns are supportive of the formation of the dimeric mixed-ligand complexes, [Ru(phen)₂]₂L(ClO₄)₄. 4H₂O and [Ru(bipy)₂]₂L(ClO₄)₄. 2H₂O. The molar conductances determined, revealed the complexes to be 1:4 electrolytes with values 562 mho cm²mol^-1and 575mho cm²mol^-1 for the complexes respectively. Semi-empirical method has been used to calculate the binding and stabilization energies of the two complexes which suggested that [Ru(phen)₂L]²⁺is more favoured thermodynamically. Mulliken charges onnitrogen atoms that are involved in coordination show that electrons are transferred from ligands to the Ru(II) ion during coordination.

dimeric;complexes;mixed – ligand;fragmentation patterns;semi-empirical method

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