Abstract
Two mononuclear complexes namely [NiII(L)] (1) and [CoIII(L)](NO3) (2) of a hexacoordinating N4O2 donor Schiff base ligand were synthesized and characterized by single crystal X-ray studies. The two complexes are isostructural with octahedral coordination environment, basal plane being occupied by four nitrogen atoms of the N,N′-bis(3-aminopropyle)ethylenediamine moiety and axial positions are being occupied by the phenolate oxygen atoms from two o-vanilline moieties. In compound 2 the central cobalt is in +3 oxidation state and found to be diamagnetic, while compound 1 with nickel ion in +2 oxidation state is paramagnetic with S=1, g=2.16, D=+6.5cm−1, |E/D|=0.33. Both the complexes display mononuclear single helical topology, may be due to the presence of rigid and bulky terminal o-vanilline to a comparatively flexible central N,N′-bis(3-aminopropyle)ethylenediamine moiety.
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