A molecular butterfly: Self-assembly of an imidazolate bridged tetranuclear nickel(II) compound from Ni(II) and 3-(4-methylimidazol-5-yl)methylene-hydrazonobutan-2-one oxime

作者：Naskar Jnan Prakash^*; Biswas Chiranjan; Guhathakurta Bhargab; Lu Liping; Zhu Miaoli

来源：Polyhedron, 2012, 42(1): 276-281.

DOI：10.1016/j.poly.2012.05.033

• Schiff-base ligand
• Tetranuclear nickel(II) complex
• X-ray crystal structure
• Redox behavior
• BVS calculation

Reaction of the Schiff-base ligand, 3-(4-methylimidazol-5-yl)methylenehydrazonobutan-2-one oxime (H2L) with nickel(II) perchlorate hexahydrate in 1:1 molar proportion in methanol gives rise to a tetranuclear nickel(II) compound, Ni4L4 (1) in moderate yield. The compound has been characterized by C, H, N microanalyses, FT-IR. UV-Vis spectra and room temperature magnetic susceptibility measurements. The X-ray crystal structure of the title compound has been determined. The structure reveals that it is an imidazolate bridged neutral tetranuclear nickel(II) compound. The nickel(II) centers in 1 adopt a rare %26apos;butterfly-like%26apos; topology. The compound crystallizes in the monoclinic space group P2(1)/c with a = 17.648 (4), b = 23.209 (5), c= 14.418 (3) angstrom, beta = 108.708 (2)degrees, V = 5593 (2) angstrom(3) and Z = 4. Individual nickel-(II) center is in square-planar %26apos;N-4%26apos; coordination chromophore. Electrochemical studies show Ni(II) to Ni(III) oxidation along with Ni(II) to Ni(I) reduction in dichloromethane solution. Bond-Valence Sum (BVS) model calculation was performed to assign the oxidation state of each nickel center in 1.

• 出版日期2012-7-25
• 单位山西大学