一维链状双草胺酸配合物[Cu(2,4,6-tmpa)_2]_n的合成、结构与磁性研究

Synthesis,Crystal Structure and Magnetic Properties of One-dimensional Chain of Bis-oxamato Complex[Cu(2,4,6-tmpa)_2]_n

以草酰氯乙酯和2,4,6-三甲基苯胺为原料,合成了N-2,4,6三甲基苯基草胺酸乙酯,然后用硝酸铜与N-2,4,6三甲基苯基草胺酸乙酯在弱酸性条件下,制备了铜的一维链状配合物[Cu(2,4,6-tmpa)_2]_n(1)(2,4,6-tmpa为N-2,4,6-三甲基苯基草胺酸根离子),并对其进行了元素分析、X-射线单晶结构分析和变温磁化率表征.晶体结构表明,配合物1的中心原子Cu(Ⅱ)处于五配位四方锥构型的配位环境中,通过羧基氧反式桥连形成1个一维链结构.变温磁化率分析表明,配合物1中铜(Ⅱ)离子间存在弱的铁磁相互作用,最佳拟合值为J=0.043 cm^(-1),g=2.15.

N-2,4,6-trimethylphenloxamate was synthesized and 2, 4, 6-trimethyaniline. Then Cu （NO3）2 is employed by to trimethylphenloxamate to prepare the one-dimensional chain of [-Cu （ ethyl oxalyl monochloride react with N-2, 4, 6- 2,4,6-tmpa）2]n ,（1）. Complex 1 is characterized by elemental analysis, X-ray crystal structure analysis and variable temperature magnetic measurements. X-ray crystal structure analysis shows that Cu （ II ） ion lies in a distorted tetragonal pyramid geometry （five-coordinated） and a one-dimensional chain structure is formed by the carboxylic bridges. Weak ferromagnetic interaction is operating between Cu （ II ） ions in the chain and the best fitting to the experimental data gives J = 0. 043 cm-1, g=2.15.