%0 Journal Article
%T Synthesis, Characterization, and Crystal Structure of [Co4(CH3CO2)2L4]2[BPh4]4 0.5H2O, Where HL = 4-(Salicylaldiminato)antipyrine
%A Ramadan M. El-mehdawi
%A Abdussalam N. EL-dewik
%A Mufida M. Ben-Younes
%A Fathia A. Treish
%A Ramadan G. Abuhmaiera
%A Dejan Poleti
%A Jelena Rogan
%J Journal of Crystallography
%D 2014
%R 10.1155/2014/481572
%X The title complex was isolated as a red solid from the reaction of 4-(salicylaldiminato)antipyrine, HL, and cobalt (II) acetate in ethanol. The complex has been characterized by elemental analysis, FTIR, UV-Vis, and X-ray single crystal diffraction. Two crystallographically different cationic units, A and B, of the title complex are found. Both units are essentially isostructural; nevertheless, small differences exist between them. Both units contain four cobalt atoms arranged at the corners of distorted cubane-like core alternatively with phenoxy oxygen of the Schiff base. In both cases, one cobalt binds to three coordinated sites from the corresponding tridentate Schiff base ligand, and the fourth one was bonded by the acetate oxygen, and the fifth and the sixth donor sites come from the phenolate oxygen of another Schiff base ligand. 1. Introduction Polynuclear as well as binuclear Co(II) complexes have attracted much attention due to their potential advantages than mononuclear complexes toward the preparation of molecular magnets and their application in data storage and memory devices [1]. The discovery of single molecule magnetism (SMM) in high-spin Ni(II) molecular clusters, particularly in cubane-like tetranuclear Ni(II) complexes, revived the interest in such compounds in order to study the correlation between the magnetic anisotropy of the high-spin ground state and the magnetization at low temperatures [2]. In comparison to mononuclear complexes, binuclear and polynuclear complexes could also provide more than one metal active center as Lewis acid in catalytic process, which is the interest of many researchers [3]. Crystal structures of complexes containing Co4O4 cubane-like core, as Co4O4(OAc)2(bpy)4 (ClO4)2, Co4(CH3O)4(C5H7O2)4(C2H3O2) , and Co4O4(C8H9N2O2) 7.5H2O [4], are well-known for several decades. Polynuclear metal complexes with tridentate ligands containing at least one hydroxyl group and oxygen as terminal coordinating atom have been reported and attracted much attention [5]. These ligands often form polynuclear complexes with cubane or double cubane structure with missing one vertex each [6]. Antipyrine and its derivatives are one of such compounds that act as tridentate ligands, and this type of ligands has been attractive to researchers, since they are used as antifever and pain reliving drugs [7]. Transition metal Schiff base complexes have been also used as antifungal and antibacterial reagents [8]. It is shown that transition metal complexes containing 4-aminoantipyrine as a Schiff base have anticancer and antibacterial
%U http://www.hindawi.com/journals/jcrys/2014/481572/