Magnetostructural Correlation Study of a Novel Strong Antiferromagnetic Dimer Copper(II) Coordination Complex with Mono-Methyl Phthalate

Abstract

We prepared and obtained a novel dinuclear copper(II) coordination complex [Cu2(mMP)2(H2O)2]2· 2H2O (1) using mono-methyl phthalate as a ligand (mMP is a mono-methyl phthalate or 1,2benzenedicarboxylate 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. 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 [Article] www.whxb.pku.edu.cn 物理化学学报(Wuli Huaxue Xuebao) Acta Phys. -Chim. Sin. 2011, 27 (7), 1595-1599 July Received: March 29, 2011; Revised: May 19, 2011; Published on Web: June 3, 2011. ∗Corresponding author. Email: jialihui715@gmail.com; Tel: +86-27-87556265; Fax: +86-27-87556264. The project was supported by the National Natural Science Foundation of China (21002076). 国家自然科学基金(21002076)资助项目 C Editorial office of Acta Physico-Chimica Sinica 1595 Vol.27 Acta Phys. -Chim. Sin. 2011 strong antiferromagnetic interaction in the dimeric copper(II) carboxylate is an electronic structure of the bridging O-C-O moiety.