A New Type of Single-Helix Coordination Polymer with Mixed Ligands [M2(phen)2(e,a-cis-1,4-chdc)2(H2O)2]n
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- 作者：Yanjuan Qi ; Yonghui Wang ; Changwen Hu ; Minhua Cao ; Li Mao ; and Enbo Wang
- 刊名：Inorganic Chemistry
- 出版年：2003
- 出版时间：December 15, 2003
- 年：2003
- 卷：42
- 期：25
- 页码：8519 - 8523
- 全文大小：218K
- 年卷期：v.42,no.25(December 15, 2003)
- ISSN：1520-510X
文摘
A new family of single-stranded helices coordination polymers with mixed ligands, [M2(phen)2(e,a-cis-1,4-chdc)2(H2O)2]n (1, M = Co; 2, M = Ni; chdc = cyclohexanedicarboxylic acid; phen = 1,10-phenanthroline), were preparedunder hydrothermal conditions and characterized by elemental analyses, IR spectra, TG analysis, and single-crystal X-ray diffraction analysis. X-ray crystal structural analyses reveal that 1 and 2 are isomorphic and belongto the monoclinic system. C40H36Co2N4O10, P21/c, a = 10.0566(5) Å, b = 8.8843(5) Å, c = 20.2912(14) Å, 
mages/gifchars/beta2.gif" BORDER=0 ALIGN="middle"> =100.052(3)mages/entities/deg.gif">, Z = 2 for 1; and C40H36Ni2N4O10, P21/c, a = 9.8921(6) Å, b = 9.0151(4) Å, c = 20.1628(17) Å, mages/gifchars/beta2.gif" BORDER=0 ALIGN="middle">= 100.31(2)mages/entities/deg.gif">, Z = 2 for 2. In the structures of 1 and 2, the 1,4-chdc ligand possesses only one kind of e,a-cis-conformation although there are both cis- and trans-conformations in the raw material. Two oxygen atoms of onecarboxyl in 1,4-chdc ligand and another oxygen atom of contraposition carboxyl link adjacent Co or Ni atoms intoan infinite 1-D zigzag chain. The most attractive structural feature of 1 and 2 is that they both exhibit an infinitechiral chainlike structure with 21 helices along the b axis. In addition, the right-handed and the left-handed chainsare alternate. Meanwhile, the adjacent chains of 1 and 2 are linked via hydrogen bonds into 2-D network structures,which further form 3-D frameworks via mages/gifchars/pi.gif" BORDER=0 >-mages/gifchars/pi.gif" BORDER=0 > interactions of 1,10-phen.