Acta Chimica Sinica ›› 2008, Vol. 66 ›› Issue (12): 1429-1434. Previous Articles     Next Articles

新型二维异核配位聚合物{[NdBi(cydta)(NO3)2(H2O)4]•2.5H2O}n的 晶体结构与热分解

蒋琪英a 邓洪权a 胡亚敏a 沈 娟a,b 钟国清*,a 胡宁海c   

  1. (a西南科技大学化学系 绵阳 621010)
    (b四川大学分析测试中心 成都 610064)
    (c中国科学院长春应用化学研究所 长春 130022)
  • 收稿日期:2007-10-08 修回日期:2008-01-07 出版日期:2008-06-28 发布日期:2008-06-28
  • 通讯作者: 钟国清

Crystal Structure and Thermal Decomposition of a 2D Heterometallic Coordination Polymer {[NdBi(cydta)(NO3)2(H2O)4]•2.5H2O}n

JIANG, Qi-Ying a DENG, Hong-Quan a HU, Ya-Min a SHEN, Juan a,b
ZHONG, Guo-Qing *,a HU, Ning-Hai c   

  1. (a Department of Chemistry, Southwest University of Science and Technology, Mianyang 621010)
    (b Analytical & Testing Center, Sichuan University, Chengdu 610064)
    (c Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022)
  • Received:2007-10-08 Revised:2008-01-07 Online:2008-06-28 Published:2008-06-28
  • Contact: ZHONG, Guo-Qing

A Bi(III)-Nd(III) heterometallic coordination polymer, {[(NO3)Nd(H2O)4(μ3-cydta)Bi- (μ-ONO2)]•2.5H2O}n, was synthesized by Bi(Hcydta)•5H2O and Nd(NO3)•6H2O at a molar ratio of 1︰1 in distilled water (cydta=trans-cyclohexylene-1,2-diaminetetraacetate). The compound was characterized by elemental analysis, FT-IR, TG-DSC and X-ray single crystal diffraction. It crystallizes in the triclinic system, space group with a=0.9235(3) nm, b=1.0902(4) nm, c=1.4253(5) nm, α=71.840(4)°, β=86.877(4)°, γ=76.991(4)°, Z=2, Mr=936.65, V=1.3284(8) nm3, Dc=2.342 g•cm-3, μ=8.646 mm-1, F(000)=900, R1=0.0406, and wR2=0.1124. In this complex, Bi atom is octahedrally coordinated by four carboxyl O atoms and two amido N atoms from a single cydta4- anion, and two O atoms from different two anions, forming a distorted bicapped trigonal prism geometry. Nd atom is bonded to four O atoms from four H2O molecules, two O atoms from one anion, and three O atoms from three bridging carboxylate groups belonging to different cydta4- anions, resulting in nine coordination number with a tricapped trigonal prism geometry. The bridging cydta4- between Bi—Nd atoms and between Bi—Bi atoms result in a novel infinite 2D network structure. FT-IR spectrum and DSC indicate that thermal decomposition proceeded in several stages: dehydration, pyrolysis of ligand, and final decomposition of salt, and the residue is oxide in the formula BiNdO3 at the temperature of 625 ℃.

Key words: heteronuclear complex, bismuth(III), neodymium(III), aminopolycarboxylate ligand, crystal structure