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Coordination Compounds as Ligands: Binuclear Copper(II), Nickel(II) and Cobalt(II) Complexes
Poddar, S. N.,Kundu, B. C.
, p. 488 - 492 (2007/10/02)
o-N-(salicylidene)aminobenzoylhydrazine, (LH2), forms bi-metallic complexes of the formula MX2.nH2O, where X = Cl, Br, I or ClO4 for M = Ni(II) Co(II), and X = Cl, Br and ClO4 for M = Cu(II); n = 0, 2, 4 and 5.In these compounds, the complexing ligand M(LH)2 binds the second metal ion through its two phenolic oxygen atoms placed cis to each other.Two heteronuclear compounds of nickel, having the formula NiCl2 and NiCl2 have also been obtained from Co(LH)2 and Cu(LH)2 respectively.The C-O stretching frequency around 1525 cm-1 in the complexing ligands M(LH)2 is shifted to around 1550 cm-1 in the bimetallic complexes, and this serves as an indication of the existence of tricovalent oxygen atoms in these complexes.
