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Syntheses, characterization and X-ray crystal structures of a mono- and a penta-nuclear nickel(II) complex with oximato Schiff base ligands |
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| Authors: | Debdulal Maity Shouvik Chattopadhyay Michael GB Drew |
| Institution: | a Department of Chemistry, Presidency College, Kolkata 700 073, India b Department of Chemistry, Darjeeling Government College, Darjeeling 734 101, India c Department of Chemistry (Inorganic Section), Jadavpur University, Kolkata 700 032, India d Department of Chemistry, University College of Science, University of Calcutta, 92, A.P.C. Road, Kolkata 700 009, India e School of Chemistry, The University of Reading, P.O. Box 224, Whiteknights, Reading RG6 6AD, UK |
| Abstract: | A mononuclear octahedral nickel(II) complex Ni(HL1)2](SCN)2 (1) and an unusual penta-nuclear complex {(NiL2)(μ-SCN)}4Ni(NCS)2]·2CH3CN (2) where HL1 = 3-(2-aminoethylimino)butan-2-one oxime and HL2 = 3-(hydroxyimino)butan-2-ylidene)amino)propylimino)butan-2-one oxime have been prepared and characterized by X-ray crystallography. The mono-condensed ligand, HL1, was prepared by the 1:1 condensation of the 1,2-diaminoethane with diacetylmonoxime in methanol under high dilution. Complex 1 is found to be a mer isomer and the amine hydrogen atoms are involved in extensive hydrogen bonding with the thiocyanate anions. The dicondensed ligand, HL2, was prepared by the 1:2 condensation of the 1,3-diaminopropane with diacetylmonoxime in methanol. The central nickel(II) in 2 is coordinated by six nitrogen atoms of six thiocyanate groups, four of which utilize their sulphur atoms to connect four NiL2 moieties to form a penta-nuclear complex and it is unique in the sense that this is the first thiocyanato bridged penta-nuclear nickel(II) compound with Schiff base ligands. |
| Keywords: | Schiff base Oxime Nickel(II) Pentanuclear Crystal structure |
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