A new type of single-helix coordination polymer with mixed ligands [M-2(phen)(2)(e,a-cis-1,4-chdc)(2)(H2O)(2)](n) (M = Co and Ni; phen 1,10-phenanthroline; chdc = cyclohexanedicarboxylate)

作者：Qi YJ; Wang YH; Hu CW^*; Cao MH; Mao L; Wang EB

来源：Inorganic Chemistry, 2003, 42(25): 8519-8523.

DOI：10.1021/ic034796p

A new family of single-stranded helices coordination polymers with mixed ligands, [M-2(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 prepared under 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 belong to the monoclinic system. C40H36Co2N4O10, P2(1)/c, a = 10.0566(5) Angstrom, b = 8.8843(5) Angstrom, c = 20.2912(14) Angstrom, beta = 100.052(3)degrees, Z = 2 for 1; and C40H36Ni2N4O10, P2(1)/c, a = 9.8921(6) Angstrom, b = 9.0151(4) Angstrom, c = 20.1628(17) Angstrom, beta = 100.31(2)degrees, 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 one carboxyl in 1,4-chdc ligand and another oxygen atom of contraposition carboxyl link adjacent Co or Ni atoms into an infinite 1-D zigzag chain. The most attractive structural feature of 1 and 2 is that they both exhibit an infinite chiral chainlike structure with 2(1) helices along the b axis. In addition, the right-handed and the left-handed chains are 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 pi-pi interactions of 1,10-phen.

• 出版日期2003-12-15
• 单位东北师范大学; 北京理工大学