Synthesis, structure and properties of a mononuclear nickel(II) acetate complex containing a tetradentate N-donor Schiff base

Department of Chemistry, The University of Burdwan, Burdwan-713 104, West Bengal, India

E-mail : barin_l@yahoo.co.uk    Fax : 91-342-2530452

Manuscript received online 23 July 2012, accepted 30 July 2012.

One hexacoordinated mononuclear compound of the type [Ni(L)(CH₃COO)PF₆ (1) [L = N,N'-(bis(pyridine-2-yl)benzylidine)-1,4-butanediamine] has been synthesized and characterized by physico-chemical and spectroscopic methods. Single crystal X-ray structural analysis shows that nickel(ll) center in 1 adopts a disto1·ted octahedral geometry bound by four N atoms of L and two 0 atoms of an acetate in chelating fashions. In crystalline state, mononuclear units in 1 are engaged in weak cooperative intermolecular C...H...O hydrogen bonds and π...π interactions afl'o1·ding to a 2D sheet structure. Compound 1 is thermally stable up to 251 °C and displays ¹(π-π*) fluorescence at room temperature in DMF solution.