Reaction of dichlorobis(benzildihydrazone)Ni(II) with biacetylmonoxime in 1:4 molar proportion generates diamagnetic Ni2L2 where LH2 (H = dissociable oximato proton) is HO-N=C(CH3)-C(CH3)=N-N=C(C6H5)-C(C6H5)=N-N=C(CH3)-C(CH3)=N-OH. Our molecular mechanics calculations show that Ni2L2 is an unprecedented double stranded homotopic helicate with the metal ion having a square-planar N4 coordination.
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M. Zimmer; D.A. Tocher; G.K. Patra; J.P. Naskar; D. Datta. First Example of a double stranded helicate with square-planar coordination for the metal. Indian J. Chem. 1999, 38A, 1087-1091.
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