Abstract
Three new dinuclear complexes {[Co2(bpta)(2,2′-bipy)(H2O)]·2CH3CN·3H2O}n (M = Co (1), Ni (2)), and {[Co(H2bpta)(4,4′-bipy)]·H2O}n (3) have been obtained through a mixed-ligands strategy. They were characterized by IR spectroscopy, elemental analysis, single-crystal X-ray diffraction and powder X-ray diffraction analysis. Structural analysis reveals that different dinuclear SBUs are formed by carboxylate groups of H4bpta ligands binding with metal ions in 1−3. The H4bpta ligands act as μ7-κ2:κ2:κ1:κ2 and μ3-κ2:κ0:κ1:κ0 coordination modes, respectively. For 1 and 2, the hexa-coordinated Co/Ni(II) ions are connected to form [M2(OCO)2(μ2-O)] SBUs by syn−syn-OCO− and μ2–oxo carboxylate bridges. The structures show (4,4)-connected 3D net with {42.84}-pts topology by bpta4− ligands linking [M2(OCO)2(μ2-O)] SBUs. Complex 3 possesses penta-coordinate geometry and displays a (2,6)-connected 2D layer formed by H2bpta2− and 4,4′-bipy ligands linking dinuclear [Co2(OCO)2] SBUs. The studies of the magnetic properties of 1−3 in the temperature range 1.8–300 K reveal that weak antiferromagnetic interaction exists in the triple and double bridging SBUs of the complexes 1 (J = −11.32 (6) cm−1) and 3 (J = −0.84(4) cm−1). Complex 2 exhibits ferromagnetic exchange (J = 1.02(7) cm−1) in dinuclear [Ni2(OCO)2(μ2-O)] units.
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