2,6-双[N-(1′,1′-二甲基-2′-羟基)甲酰胺]吡啶及镍(Ⅱ)配合物的合成与光谱学研究

Synthesis and Spectral Studies of Nickel(Ⅱ) Complex of 2,6-Bis [N-(1,1'-Dimethyl-2'-Hydroxy)Carbamoyl] Pyridine

合成并表征了有机配体2,6-双[N-(1′,1′-二甲基-2′-羟基)甲酰胺]吡啶(L)及其镍(Ⅱ)配合物,采用元素分析确定目标配合物组成为C15H21N3O4Ni.H2O,通过对比分析的方法讨论了配位前后游离配体L和镍(Ⅱ)配合物的核磁共振氢谱、核磁共振碳谱、红外吸收光谱和紫外-可见吸收光谱的谱学性质,进而推断出镍(Ⅱ)配合物的结构。结果表明,配体2,6-双[N-(1′,1′-二甲基-2′-羟基)甲酰胺]吡啶以2个酰胺负离子N和1个吡啶环N原子为配位原子,与中心金属离子Ni(Ⅱ)通过三齿形式配位;配合物中Ni(Ⅱ)采取dsp2杂化轨道方式与配位原子构成配位键,中心金属Ni(Ⅱ)的配位数为4,1个Ni(Ⅱ)与1个三齿配体L和1个水分子配位,形成平面正方形构型的低自旋镍(Ⅱ)配合物。

The ligand of 2,6-bis[N-（1,1＇-dimethyl-2＇-hydroxy）carbamoyl]pyridine and its nickel（Ⅱ） complex were synthesized and characterized by using 1H-NMR,13C-NMR,FTIR,UV-Vis and elemental analysis,and the complex formulae of C15H21N3O4Ni·H2O were determined.The spectral property of the free ligand and its nickel（Ⅱ） complex was discussed with the comparison method,and then the structure of nickel（Ⅱ） complex was determined.The spectral analysis results show that 2,6-bis[N-（1,1＇-dimethyl-2＇-hydroxy）carbamoyl]pyridine acts as a tridentate ligand,coordinating through two nitrogen atoms of amide anion and one nitrogen atom of aromatic pyridine-ring,and the nickel（Ⅱ） ion is a four-coordinated geometry with dsp2 hybrid orbitals for bonding these coordinating atoms.The target complex is a square planar low-spin nickel（Ⅱ） coordination compound,and a nickel（Ⅱ） ion coordinates to a tridentate ligand and one coordination water molecule.