Synthesis, structures and magnetic properties of nicotinato-copper(II) complexes with polybenzimidazole and polyamine ligands |
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Authors: | Feng-Mei Nie Fei Lu Shuang-Yan Wang Mei-Ye Jia Zhi-Yun Dong |
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Institution: | Department of Chemistry, Capital Normal University, Beijing 100048, PR China |
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Abstract: | Four novel nicotinato-copper(II) complexes containing polybenzimidazole and polyamine ligands were synthesized with formula Cu2(bbma)2(nic)2](ClO4)2·CH3OH·0.5H2O (1), Cu2(dien)2(nic)2](ClO4)2·2CH3OH (2), Cu(ntb)(nic)]ClO4·H2O (3) and Cu(tren)(nic)]BPh4·CH3OH·H2O (4), in which bbma is bis(benzimidazol-2-yl-methyl)amine, dien is diethylenetriamine, ntb is tris(2-benzimidazolylmethyl)amine, tren is tris(2-aminoethyl)amine and nic is nicotinate anion. All of the complexes were characterized by elemental analysis, IR and X-ray diffraction analysis. Complexes 1 and 2 contain centrosymmetric dinuclear entity with the two Cu(II) atoms bridged by two nicotinate anions in an anti-parallel mode. The Cu···Cu separation is 7.109 Å for 1 and 6.979 Å for 2. Complexes 3 and 4 are mononuclear with nicotinate coordinated to Cu(II) ion by the carboxylate O atom in 3 and the pyridine N atom in 4. All of the complexes exhibit abundant hydrogen bonds to form 1D chain for 1, 3, 4 and 2D network for 2. Magnetic susceptibility measurements over the 2-300 K range reveal very weak ferromagnetic interaction between the two Cu(II) ions in 1 and antiferromagnetic interaction in 2 mediated by nicotinate ligand, with J value to be 0.15 and −0.19 cm−1, respectively. |
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Keywords: | Copper(II) complex Nicotinic acid Crystal structure Magnetic property |
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