The diamagnetic dinuclear complex Ni 2 L 4 was synthesized by the reaction of NiCl 2 •6H 2 O with 2 mercaptobenzimidazole (LH) in ethanol in the presence of Et 3 N. The solid state reaction (reagent ratio Ni : LH = 1 : 2) followed by recrystallization of the reaction product from a MeCN-THF mixture afforded crystals of the associate [Ni 2 L 4 ] 2 •[NiCl 2 (LH) 2 (MeCN) 2 ] containing four acetonitrile solvate molecules. Crystals of 2•4MeCN exhibit ferromagnetic properties at helium temperatures.Key words: mono and dinuclear 2 mercaptobenzimidazole nickel(II) complexes; X ray diffraction study, magnetic properties. Molecular magnetic systems containing high spin transition metal atoms have attracted considerable atten tion due to their possible use in molecular electronics and spintronics. 1 In the last decade, the number of new com pounds exhibiting ferromagnetic properties or at least fer romagnetic spin spin exchange interactions has increased considerably. 2-5 Among these compounds are polynuclear nickel pivalate complexes containing two, 6-10 four, 11 or five 12 metal atoms characterized by ferromagnetic spin spin exchange interactions. In these molecules, the Ni II atoms are linked by bridging carboxylate groups, as well as by aqua, hydroxo, or oxo bridges. In the present study, we synthesized new polynuclear nickel(II) com plexes with 2 mercaptobenzimidazole (LH) containing S-C-N bridges. 13
Results and DiscussionThe reaction of NiCl 2 •6H 2 O with LH in EtOH in the presence of Et 3 N produces the dinuclear nickel complex Ni 2 (µ (L)) 4 (1) (Scheme 1). † Deceased.
Scheme 1Reagents and conditions: 90 °C, EtOH (1 : 1), Et 3 N.
Using the reactions of copper(II) acetate magnesium(II) oxide with 2-furancarboxylic acid (HFur), compounds with chemical compositions [Cu 2 (Fur) 4 (MeCN) 2 ] (I) and [Mg 2 (Fur) According to the X-ray diffraction data (CIF files CCDC nos. 2085817 (I) and 2085818 (II)), both complexes have a binuclear structure. The metal core of I correspond to the tetracarboxylate bridged {Cu 2 (μ-Fur) 4 } complex, the coordination number of the copper atom in which is 5 (CuNO 4 ); in II, the metal atoms are linked by two carboxylate groups and a water molecule, and the coordination environment of the metal centers is completed to the polyhedron (MgO 6 ) by oxygen atoms of the Furanions and water molecules. According to EPR spectroscopy data, exchange-coupled copper(II) dimers with a substantial zero-field splitting are observed in I. For I and II, antibacterial activity against the nonpathogenic strain of M. smegmatis, and cytotoxicity against human ovarian adenocarcinoma cells SCOV3 and normal human fibroblast cells of the HDF line have been determined.
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