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An Oxalate-Bridged Copper(II) Complex Combining Monodentate Benzoate 22′-bipyridine and Aqua Ligands: Synthesis Crystal Structure and Investigation of Magnetic Properties

机译:单齿苯甲酸酯22-联吡啶和水配体结合的草酸盐桥连的铜(II)配合物:合成晶体结构和磁性的研究

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摘要

A dinuclear copper(II) complex of formula [{Cu( )( )(OH )} (μ- )] ( ) (where = 2,2′-bipyridine, = benzoate and = oxalate) was synthesised and characterised by diffractometric (powder and single-crystal XRD) and thermogravimetric (TG/DTG) analyses, spectroscopic techniques (IR, Raman, electron paramagnetic resonance spectroscopy (EPR) and electronic spectroscopy), magnetic measurements and density functional theory (DFT) calculations. The analysis of the crystal structure revealed that the oxalate ligand is in bis(bidentate) coordination mode between two copper(II) centres. The other four positions of the coordination environment of the copper(II) ion are occupied by one water molecule, a bidentate and a monodentate ligand. An inversion centre located on the ox ligand generates the other half of the dinuclear complex. Intermolecular hydrogen bonds and π-π interactions are responsible for the organisation of the molecules in the solid state. Molar magnetic susceptibility and field dependence magnetisation studies evidenced a weak intramolecular–ferromagnetic interaction ( = +2.9 cm ) between the metal ions. The sign and magnitude of the calculated value by density functional theory (DFT) are in agreement with the experimental data.
机译:合成了式[{Cu()()(OH)}(μ-)]()(其中= 2,2'-联吡啶,=苯甲酸酯和=草酸酯)的双核铜(II)络合物,并通过衍射法表征(粉末和单晶XRD)和热重分析(TG / DTG)分析,光谱技术(红外,拉曼,电子顺磁共振光谱(EPR)和电子光谱),磁测量和密度泛函理论(DFT)计算。晶体结构分析表明,草酸酯配体处于两个铜(II)中心之间的双(双齿)配位模式。铜(II)离子配位环境的其他四个位置被一个水分子,一个双齿和一个单齿配体占据。位于ox配体上的转化中心产生双核复合物的另一半。分子间氢键和π-π相互作用负责固态分子的组织。摩尔磁化率和磁场依赖性磁化研究表明,金属离子之间的分子内铁磁相互作用弱(= +2.9 cm)。密度泛函理论(DFT)计算值的符号和大小与实验数据一致。

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