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A nickel(II) complex with 2-{1-[6-(1-selenosemicarbozonoethyl)-2-pyridyl]ethylidene}hydrazine carbonitrile was synthesized by reaction of Ni(II) acetate and 2,6-diacetylpyridine bis(selenosemicarbazone) (H2dapsesc) in ethanolic solution, and purified by dissolution in DMF and precipitation by slow addition of ethanol. The obtained complex was characterized by elemental analysis and spectroscopic measurements (IR, H NMR, C NMR), which showed that modification of one side chain of the symmetrical H2dapsesc ligand with elimination of hydrogen selenide occurred during the reaction. The structure of the complex was determined by X-ray analysis. The unsymmetrical bideprotonated ligand coordinates the metal in a square planar geometry by a N3Se chelation, which generates two five-membered and one six-membered chelation rings. The overall neutral complex is planar and the crystal packing is based on N-H ...N hydrogen bonds and on long Ni ...Ni contacts (3.71Å). m41.p34

Crystal structure of nickel(II) complex with 2-{1-[6-(1-selenosemicarbazonoethyl)-2-pyridyl]ethylidene}hydrazine carbonitrile