Maria Cocu,

Ion Bulhac,

Eduard Coropceanu,

Elena Melnic,

Sergiu Shova,

Olga Ciobanica,

Victoria Gutium,

New organic ligand L resulting from isonicotinic hydrazide and 2,4-pentanedione has been prepared and investigated by physicochemical methods, including elemental analysis, ¹H and ¹³C NMR, IR spectroscopy and X-ray studies.

The X-ray investigation revealed that the condensation of 2,4-pentanedione with isonicotinic hydrazide is accompanied by the formation of a five-membered ring including three carbon atoms of 2,4-pentanedione and two nitrogen atoms of the isonicotinic hydrazide fragment.

The reaction between [Co(DfgH)₂Br(H₂O)] (DfgH₂ = diphenylglyoxime) and L resulted in the formation of the mononuclear octahedral complex [Co(DfgH)₂BrL] with the substitution of the water molecule in the apical position by the ligand L. The reaction starting from [Co(DmgH)₂Cl(H₂O)] (DmgH = dimethylglyoxime) and L resulted in the mononuclear octahedral Co(III) complex with the composition [Co(DmgH)₂ClL′] , where L′unexpectedly represents a dehydrated derivative of L. The two coordination compounds are characterized by X-ray diffraction method. The IR, ¹H NMR spectral studies of new compounds are also reported.

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