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Journal of Coordination Chemistry
Year: 2011  |  Volume: 64  |  Issue: 15  |  Page No.: 2706 - 2717

Synthesis, crystal structures, thermal, and spectroscopic properties of four new metal(II) (M = Co, Ni, Cu, Hg) complexes of 2-benzoylbenzoate with 3-picoline

Sema Caglar, Zerrin Heren and Orhan Buyukgungor    

Abstract: Four 2-benzoylbenzoate (bba) complexes, [Co(bba)2(H2O)2(3-pic)2] (1), [Ni(bba)2(H2O)2(3-pic)2] (2), [Cu(bba)2(3-pic)2] (3), and [Hg(bba)2(3-pic)2] (4), have been synthesized and characterized by IR spectra, thermal (TG, DTG, and DTA) analysis, and single crystal X-ray diffraction. All the complexes consist of neutral monomeric units with 1 and 2 crystallizing in the orthorhombic (P n a 21), 3 in triclinic (P -1), and 4 in monoclinic (P21/c) crystal systems. The metal(II) ions exhibit distorted octahedral coordination for 1, 2, and 3 and mercury(II) exhibits distorted trigonal prism coordination. In 1 and 2, bba is monodentate, whereas in 3 and 4 bba is bidentate. 3-Picoline (3-pic) is a classical N-monodentate ligand. Bba are coordinated to metal(II) with carboxylates and IR spectra of all complexes display characteristic absorptions of carboxylate {υ(OCO)asym and υ(OCO)sym}. Thermogravimetric (TG) analyses show that 1 and 2 are thermally stable (Tdecomp. > 60°C) and 3 and 4 are thermally stable (Tdecomp. > 120°C).

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