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Abstract
Six dinuclear nickel(II) complexes of the form Ni2(teke)(tmen)2X2 have been prepared, with teke being a tetraketonate such as 1,1,2,2-tetraacetylethanediide (taet) or 1,2-diacetyl-1,2-dibenzoylethanediide (dabe), tmen a N,N,N′,N′-tetramethylethylenediamine, and X− is an anion, namely BPh4 −, CIO4 − or NO3 −. The crystal structure of Ni2(taet)(tmen)2(CIO4)2 · 3H2O was determined by X-ray methods, in which the geometries of the two Ni(II) ions in the dinulcear cation are different. One has an octahedral structure and the other is square planar. The structures of the two nickel moieties in the tetraphenylborate and the nitrate complexes are square planar — square planar and octahedral-octahedral, respectively. These complexes, which are very soluble in organic solvents, show characteristic chromotropic behaviour in solution due to solvent donor and acceptor properties.