Structural and magnetic properties of metal complexes with pyridine-2,6-dicarboxylate and 5-(4-bromophenyl)-2,4′-bipyridine |
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Authors: | Shu-Xin Cui Yu-Long Zhao Jing-Ping Zhang Qun Liu Yan Zhang |
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Affiliation: | 1. Faculty of Chemistry, Northeast Normal University, Changchun 130024, China;2. Department of Physics, Peking University, Beijing 100871, China |
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Abstract: | A series of complexes has been synthesized based on pyridine-2,6-dicarboxylate (L1) as the bridging ligand and 5-(4-bromophenyl)-2,4′-bipyridine (L2) as the pendant with different metal ions such as NiII, CoII, and CuII, under hydrothermal conditions. In nickel and cobalt complexes [M(L1)(L2)2 · H2O]n (M = Ni2+ or Co2+), the metal ions are bridged by L1 to form 1D coordination zigzag polymeric chains with L2 pendants possessing hexa-coordinated distorted octahedral geometries. While the copper ions are penta-coordinated by L1 and L2 with distorted square pyramidal geometries forming the tetranuclear cluster with the formula [Cu4(L1)4(L2)4] · 2H2O. It has been found that both the structure and magnetic property of these complexes are metal ions dependent. Intramolecular antiferromagnetic interactions were observed in the nickel and cobalt 1D coordination polymers, while ferromagnetic coupling was found in the tetranuclear copper cluster. Density functional theory calculations suggested that the O–C–O bridges of L1 in a basal–apical mode are responsible for intracluster intermetallic ferromagnetic exchange for the tetranuclear copper cluster. |
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Keywords: | Carboxylate ligand Bipyridine ligand Tetranuclear cluster Magnetic properties Crystal structure |
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