摘要
在水热反应条件下 ,设计合成了一种新型三维配位聚合物 [La(C5H4NCOO) 3 (H2 O) 2 ]n 的单晶体 ,对其进行了元素分析、热重分析、红外光谱表征、X射线单晶衍射测定。该配位聚合物属单斜晶系 ,P2 (1) /c空间群 ,晶胞参数为a =0 .974 7(4)nm ,b =1.990 4 (7)nm ,c =1.16 13(4)nm ,α =90° ,β =111.76 1(6 )°,γ =90°,V =2 .0 92 5 (13)nm3 ,Z =4 ,dc=1.718g/cm3 ,μ =2 .0 90mm-1,F(0 0 0 ) =10 6 4 ,R1=0 .0 374 ,wR2 =0 .0 6 83。X射线衍射结果显示La3 + 离子之间以4 氰基吡啶的羧基为桥形成一维链状结构 ,通过 4 氰基吡啶的吡啶基与配位的水分子之间的氢键形成三维的网络结构。热重分析表明该配位聚合物在 2 30℃下稳定。
A novel three-dimensional coordination polymer [La(C_5H_4NCOO)_3(H_2O)_2]_ n was synthesized by hydrothermal reaction of 4-cyanopyridine and La(NO)_3·6H_2O. The structure was characterized by elemental and thermal gravimetric analysis as well as IR spectroscopy. X-ray diffraction analysis reveals the structure consists of [La(C_5H_4NCOO)_3(H_2O)_2]_ n . The crystal belongs to monoclinic crystal system, space group P 2(1)/c .Crystallographic data: a =0.9747(4)nm, b =1.9904(7)nm, c =1.1613(4)nm, α =90°, β = 111.761(6)° , γ =90°, V =2.0925(13)nm 3, Z =4, d _c=1.718g/cm 3, μ =2.090mm -1 , F (000)=1064, R 1=0.0374 , wR 2=0.0683. X-ray analysis also reveals that one-dimensional chain is formed between La 3+ and La 3+ by carboxyl of 4-cyanopyridine. Three-dimensional nets are formed by various hydrogen bonds. Thermal gravimetric analysis displays that the frameworks exist stably below 230℃.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2003年第4期310-314,共5页
Journal of Synthetic Crystals
基金
国家自然科学基金项目 (No .2 0 1760 0 8)
河北省自然基金项目 (No .2 0 2 0 0 6)
