含吡啶-2,5-二羧酸稀土-锌配位聚合物的合成结构和性能(英文)  

Preparation, Structure and Property of Novel Lanthanide(Ⅲ)-Zinc(Ⅱ) Coordination Polymers Containing Pyridine-2,5-dicarboxylic Ligand

作　　者：梁玉仓[1] 洪茂椿[1] 曹荣[1] 翁家宝[1] 孙道峰[1] 苏伟平[1] 

机构地区：[1]结构化学国家重点实验室

出　　处：《无机化学学报》2002年第1期99-106,共8页Chinese Journal of Inorganic Chemistry

基　　金：国家杰出青年科学基金资助项目(No.29825103)。

摘　　要：Gd2O3,Zn(CH3COO)2·2H2O和吡啶-2,5-二羧酸(H2pydc)的水热反应导致一个新颖的钆-锌配位聚合物犤La2Zn2(pydc)5(H2O)2犦n(1)。化合物1的晶体属单斜晶系,空间群P21/c,a=9.5869(1),b=20.4862(3),c=10.1105(2)?,β=97.4890(10)°,V=1968.76(5)?3,Z=4。在同样的条件下,Er2O3或Tb4O7,Zn(CH3COO)2·2H2O和H2pydc的水热反应产生了与化合物1结构不同的配位聚合物犤Ln2Zn(pydc)4(H2O)8·H2O犦n(Ln=Er(2);Ln=Tb(3))。化合物2和3异质同晶,空间群P1珔。对2:a=7.8708(7),b=9.2665(8),c=13.0232(11)?,α=75.295(1),β=75.000(2),γ=79.109(2)°,V=879.67(13)?3,Z=1;对3:a=7.9105(5),b=9.3453(6),c=13.0005(9)?,α=75.3380(10),β=75.0460(10),γ=79.0050(10)°,V=890.17(10)?3,Z=1。X-射线单晶结构研究表明化合物1是一个三维网状结构,而化合物2和3为管状结构。热重分析研究表明所有化合物在380℃以下稳定。Hydrothermal reaction of La2O3, Zn(CH3COO)2·2H2O and pyridine 2,5 dicarboxylic acid (H2pydc) in water gave rise to a La? Zn? coordination polymer, [La2Zn2(pydc)5(H2O)2]n(1), which crystallizes in monoclinic space group P21/c with a=9.5869(1),b=20.4862(3),c=10.1105(2)?,β=97.4890(10)°,V=1968.76(5)?3,Z=4. However, under the same condition, hydrothermal reaction of Er2O3 or Tb4O7, Zn(CH3COO)2·2H2O and H2pydc resulted in the formation of a polymer [Ln2Zn(pydc)4(H2O)8·H2O]n(Ln=Er(2);Ln=Tb(3)). Compound 2 and 3 are isomorphous and crystallize in triclinic space group with a=7.8708(7),b=9.2665(8),c=13.0232(11)?,α=75.295(1),β=75.000(2),γ=79.109(2)°,V=879.67(13)?3,Z=1 for 2, and a=7.9105(5),b=9.3453(6),c=13.0005(9)?,α=75.3380(10),β=75.0460(10),γ=79.0050(10)°,V=890.17(10)?3,Z=1 for 3. All polymers have been characterized by single crystal X ray diffraction analyses. 1 displays a three dimensional network structure, while the crystal structure of 2 and 3 possess a tubule shape structure. Thermal gravimetric analysis studies of 1 and 2 display that the frameworks of the all compounds exist stably below 380℃ although the discrete and coordination water molecules lost in the range of 50～260℃.

关 键 词：稀土 配位聚合物 水热反应 合成 结构 性能 吡啶-2 5-二羧酸 钆 锌 

分 类 号：O614.33[理学—无机化学] O614.241[理学—化学]