| Abstract: Hydrothermal reaction of La2O3, Zn(CH3COO)2·2H2O and pyridine-2,5-dicarboxylic acid (H2pydc) in water gave rise to a La(Ⅲ)-Zn(Ⅱ) 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 P1 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℃. |
| 梁玉仓,洪茂椿,曹荣,翁家宝,孙道峰,苏伟平.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)[J].无机化学学报,2002,18(1):99-106. |
