科研之友
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摘要
We prepared and obtained a novel dinuclear copper(II) coordination complex [Cu-2(mMP)(2)(H2O)(2)](2)center dot 2H(2)O (1) using mono-methyl phthalate as a ligand (mMP is a mono-methyl phthalate or 1,2-benzenedicarboxylate monomethyl ester). The crystal structure of complex 1 was characterized by elemental analysis, IR spectroscopy, and X-ray analysis. This tetra-carboxylato-bridged dinuclear complex adopts a dimeric paddle-wheel cage structure and the coordination configuration around each copper(II) cation is square-pyramidal with four oxygen atoms of the carboxylate groups from four different monomethyl phthalate ligands and one oxygen atom of water at the apical position. Intermolecular hydrogen bonds are found between the hydrogen atoms of the coordinated or uncoordinated water and the oxygen atoms of the carboxyl from the adjacent molecules and it forms a three-dimensional (3D) network structure. The magnetic data for complex 1 indicate a strong intramolecular antiferromagnetic interaction between the two paramagnetic metal ions with a magnetic coupling constant of 2J=-324 cm(-1). In this paper, we analyzed the magnetostructural correlation of complex 1 in detail and discuss the main factor that determines the strong antiferromagnetic interaction in dimeric copper(II) carboxylates. Compared with the structure and the magnetic property of other related complexes, the main factor that determines the strong antiferromagnetic interaction in the dimeric copper(II) carboxylate is an electronic structure of the bridging O-C-O moiety.
