TY - JOUR
T1 - A single-helix coordination polymer with mixed ligands [Zn 2(phen)2(e,a-cis-1,4-chdc)2(H 2O)2]n (phen=1,10-phenanthroline; Chdc=cyclohexanedicarboxylate)
AU - Qi, Yanjuan
AU - Li, Hui
AU - Cao, Minhua
AU - Zhang, Qi
AU - Hu, Changwen
AU - Wang, Enbo
PY - 2006/1/9
Y1 - 2006/1/9
N2 - A coordination polymer with mixed ligands [Zn2(phen) 2(e,a-cis-1,4-chdc)2(H2O)2] n (chdc=cyclohexanedicarboxylic acid; phen=1,10-phenanthroline) was 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. C40H36Zn2N 4O10, P21/c, a=10.084(2) Å, b=8.9072(18) Å, c=20.276(4) Å, β=99.92(3)°, V=1793.9(6) Å3, Z=1. In the structures of 1, 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 Zn atoms into an infinite 1D zigzag chain. The most attractive structural feature of 1 is that it exhibits an infinite chiral chain-like structure with 21 helices along the b-axis. In addition, the right- and left-handed chains are alternate. Meanwhile, the adjacent chains of 1 is linked via hydrogen bonds into 2D network structures, which further form 3D frameworks via π-π interactions of 1,10-phen.
AB - A coordination polymer with mixed ligands [Zn2(phen) 2(e,a-cis-1,4-chdc)2(H2O)2] n (chdc=cyclohexanedicarboxylic acid; phen=1,10-phenanthroline) was 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. C40H36Zn2N 4O10, P21/c, a=10.084(2) Å, b=8.9072(18) Å, c=20.276(4) Å, β=99.92(3)°, V=1793.9(6) Å3, Z=1. In the structures of 1, 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 Zn atoms into an infinite 1D zigzag chain. The most attractive structural feature of 1 is that it exhibits an infinite chiral chain-like structure with 21 helices along the b-axis. In addition, the right- and left-handed chains are alternate. Meanwhile, the adjacent chains of 1 is linked via hydrogen bonds into 2D network structures, which further form 3D frameworks via π-π interactions of 1,10-phen.
KW - 3D network
KW - Chiral
KW - Helical chain
KW - Mixed ligands
UR - http://www.scopus.com/inward/record.url?scp=29244466839&partnerID=8YFLogxK
U2 - 10.1016/j.molstruc.2004.10.009
DO - 10.1016/j.molstruc.2004.10.009
M3 - Article
AN - SCOPUS:29244466839
SN - 0022-2860
VL - 782
SP - 32
EP - 35
JO - Journal of Molecular Structure
JF - Journal of Molecular Structure
IS - 1
ER -