Synthesis, crystal structures, and properties of copper(II) dicarboxylate complexes with [bis(2-pyridylcarbonyl)amido]

Four new complexes, [Cu-2(Bpca)(2)(L-1)(H2O)(2)] center dot 3H(2)O (I), [Cu-2(Bpca)(2)(L-2)(H2O)(2)] (II), [Cu-2(Bpca)(2)(L-3)] center dot 2H(2)O (III), [Cu-2(Bpca)(2)(L-1)(H2O)] center dot 2H(2)O (IV) (Bpca = bis(2-pyridylcarbonyl)amido, H2L1 = glutaric acid, H2L2 = adipic acid, H2L3 = suberic acid, H2L4 = azelaic acid) have been synthesized and characterized by single-crystal X-ray diffraction methods (CIF files CCDC nos. 1432836 (I), 1432835 (II), 817411 (III), and 817412 (IV)), elemental analyses, IR spectra. Structural analyses reveal that compounds I, II, and IV have similar structures [Cu(Bpca)](+) units bridged by dicarboxylate forming dinuclear units, whereas the dinuclear of compound III are edge-shared through two carboxylate oxygen atoms of different suberate anions. Hydrogen bonds are response for the supramolecular assembly of compounds I to IV. The temperature-dependent magnetic property of III was also investigated in the temperature range of 2 to 300 K, and the magnetic behaviour suggests weak antiferromagnetic coupling exchange.