Abstract
A new dinuclear complex of formula [(tmen)(H 2O) 2Ni(Hdmg)(dmg)Cu]·ClO 4 (H 2dmg=dimethylglyoxime, tmen=tetramethylenediamine) has been synthesized. The crystal structure of the complex has been solved by a single-crystal X-ray diffraction method. The structure consists of one cationic dinuclear complex, [(tmen)(H 2O) 2Ni(Hdmg)(dmg)Cu] +, and one anion, ClO 4 −. In the dinuclear cationic complex the copper(II) ion and the nickel(II) ion are bridged by two oximate groups, one through the nitrogen and oxygen atoms and the other only through the oxygen atom. The intramolecular Cu⋯Ni distance is 3.424 Å. The geometry around the copper atom is a distorted square pyramid, and the geometry around the nickel atom is a distorted octahedron. Variable-temperature magnetic susceptibility measurements (75–300 K) on the title complex revealed the occurrence of an intramolecular antiferromagnetic interaction through the oximate bridges. The IR and UV–Vis spectra have also been investigated.
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