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Molecular structures of nickel(II) monochelates of a racemic tridentate ligand and co-ligand induced structural variations
Authors:Himanshu Sekhar Jena  Vadivelu Manivannan
Institution:a Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781 039, India
b NMR Laboratory, Central Leather Research Institute, Adyar, Chennai 600 025, India
Abstract:Using a racemic mixture of the tridentate ligand, (((2-pyridyl)ethylamine)methyl)phenolate ion (L) and View the MathML source, NCS, (NC)2N, OAc as coligands, complexes having the formula Ni(L)(N3)] (1), Ni(L)(NCS)]2 (2), Ni2(L)2(OAc)(N(CN)2)]n (3) were prepared and structurally characterized. In 1, Ni(II) has a square planar geometry and phenolate oxygen is involved in dipolar View the MathML source?Nδ+ interaction with electrophilic central nitrogen atom of coordinated azide ion. Complex 2 is dimeric in nature and nickel(II) is penta-coordinated. Compounds 1 and 2 exist as centrosymmetric dimers made up of a pair of R and S enantiomers of L. In 3, an acetate and phenoxo bridged dinickel complex is present which is further linked to a zig-zag coordination polymer by the dicyanamide ion. In a given chain of 3, both L have same enantiomeric form and either RR or SS dimers are repeated along the chain. The magnetic properties are described.
Keywords:Nickel(II) complex  Enantiomer  Achiral  Coordination polymer  Magnetism
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