一维链状镍配位聚合物{[Ni(DNBC)_2(Im)(H_2O)]·0.25H_2O}_n的合成、晶体结构及热学性质研究

Synthesis,Crystal Structure and Thermal Properties of 1D Chain Nickel(Ⅱ) Coordination Polymer {[Ni(DNBC)_2(Im)(H_2O)]·0.25H_2O}_n

在水和乙醇混合溶液中合成了配合物{[Ni(DNBC)2(Im)(H2O)]·0.25H2O}n(DNBC=3,5-二硝基苯甲酸,Im=咪唑),并进行了元素分析、红外光谱、热重分析(TG)对其进行了表征,用单晶X-射线衍射测定了配合物的晶体结构。结果表明此配合物属正交晶系,空间群为Pbca,a=1.5022(6)nm,b=1.5146(6)nm,c=1.9269(7)nm,V=4.384(3)nm3,Z=8,F(000)=2320。配合物中金属镍原子采用五配位,分别与4个氧原子和1个咪唑氮原子配位,形成1个扭曲的四方锥体。

The complex {[Ni（DNBC）2（Im）（H2O）]·0.25H2O}n（DNBC=3,5-dinitrobenzoic acid,Im=imidazole） was synthesized in water-ethyl alcohol mixture solution and characterized by elemental analysis,IR and thermo-gravimetry（TG）.Its crystal structure was determined by single crystal X-ray diffraction.The complex crystallized crystallizes in the Orthorhombic system with space group Pbca,a=1.502 2（6） nm,b=1.514 6（6） nm,c=1.926 9（7） nm,V=4.384（3） nm3,Z=8,F（000）=2 320.The crystal structure shows the complex has a 1D chain networks,where each Ni（Ⅱ） is in 4O＋N coordination modes,each five-coordinated Ni（Ⅱ） ions form a distorted square-pyramidal geometry,oxygen atoms occupy axial center positions.