配位聚合物[Na_2Co(ncpo)_2·4H_2O]_n的合成、晶体结构与热分析(英文)

Synthesis,crystal structure and thermal analysis of a novel coordination polymer [Na_2Co(ncpo)_2·4H_2O]_n(ncpo=2-nitro-4-carboxylphenoxyacetate)

2-硝基-4-羧基-苯氧乙酸(ncpo)与两种金属离子Na(I)和Co(II)进行配位桥连得到配位聚合物[Na2Co(ncpo)2.4H2O]n,采用元素分析和红外光谱对得到的配合物进行了表征。X单晶衍射仪测定晶体结构表明:[Na2Co(ncpo)2·4H2O]n属于三斜晶系Pī空间群,晶胞参数:a=6.9212(2),b=7.8465(3),c=11.1468(5),α=85.761(1)°,β=83.978(1)°,γ=69.462(1)°。配合物中两种含有环状微孔通道的一维链构成了二维网状结构,一种链是由CoO6和NaO7构成的无机之字形链,另一种链是配体ncpo2-将Na离子连接而成的有机链。用示差扫描量热(DSC)和热重/微热重(TG/DTG)分析法研究了配合物的热分解过程。

A coordination polymer [Na2Co（ncpo）2·4H2O]n was constructed by flexible 2-nitro-4-carboxylphenoxyacetate acid connecting cobalt（II）and sodium（I）central atoms,and characterized by elemental analysis,FT-IR spectroscopy.The crystal structure was determined using X-ray single crystal diffraction,the results show that [Na2Co（ncpo）2·4H2O]n crystallizes with a triclinic unit cell in the space group Pī with cell parameters a=6.9212（2）,b=7.8465（3）,c=11.1468（5）,α=85.761（1）°,β=83.978（1）°,γ=69.462（1）°.A 2D network was generated by two kinds of chains with ring-like microporous channels,one is the zigzag inorganic chain constructed by CoO6 and NaO7,and another is formed by the ncpo2-anions linked the Na atoms.Thermal decomposition process of the coordination polymer was studied by applying the differential scanning calorimetry（DSC）and thermogravimetric/differential analysis（TG-DTG）.