title: Coordination frameworks constructed from bipyridyl piperazine and MCl2 (M = Co, Ni, Zn): structural characterization and optical properties.
abstract: Three metal-organic polymers, [CoCl2(bpfp)]n 1, {[NiCl2(bpfp)2](H2O)3}n 2 and [ZnCl2(bpfp)]n 3 (bpfp = N,N'-bis(3-pyridylformyl)piperazine), are formed by the self-assembly of the flexible bpfp with MCl2 (M = Co, Ni, Zn), respectively. X-Ray single-crystal structural analysis reveals that polymer 1 exhibits a novel grid network, in which the grid is composed of segments of bpfp and cobalt ions. Polymer 2 consists of 2D rhombohedral grids, the dimensions of the grid are 15.782 x 12.434 A2 and the diagonal-to-diagonal distances are 13.186 x 25.169 A2. In polymer 3, infinite wavelike chains are extended to 2D supramolecular arrays via C-H...Cl hydrogen bonds. The third-order nonlinear optical (NLO) behaviors of 1-3 and bpfp were investigated in dilute DMF solution by Z-scan measurement. The results show that 1, 2 and 3 exhibit good third-order NLO properties, which are quite different from bpfp that shows weak NLO behavior. This paper demonstrates that metal ions can strongly influence the crystal structures and third-order NLO properties of polymers.
authors.affiliation: Department of Chemistry, Zhengzhou University, Henan, 450052, PR China.
authors.forename: Hong
authors.initials: H
authors.lastname: Xu
authors.forename: Yinglin
authors.initials: Y
authors.lastname: Song
authors.forename: Liwei
authors.initials: L
authors.lastname: Mi
authors.forename: Hongwei
authors.initials: H
authors.lastname: Hou
authors.forename: Mingsheng
authors.initials: M
authors.lastname: Tang
authors.forename: Yali
authors.initials: Y
authors.lastname: Sang
authors.forename: Yaoting
authors.initials: Y
authors.lastname: Fan
authors.forename: Yan
authors.initials: Y
authors.lastname: Pan
mesh_terms: D015082:2,2'-Dipyridyl / Q000737:chemistry*; D002712:Chlorides / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D007477:Ions; D008024:Ligands; D008670:Metals / Q000737:chemistry; D008968:Molecular Conformation; D008970:Molecular Weight; D009532:Nickel / Q000737:chemistry*; D000077489:Piperazine; D010879:Piperazines / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D014466:Ultraviolet Rays; D014965:X-Rays; D017967:Zinc Compounds / Q000737:chemistry*
chemical_list: D002712:Chlorides; D007477:Ions; D008024:Ligands; D008670:Metals; D010879:Piperazines; D011108:Polymers; D017967:Zinc Compounds; D000077489:Piperazine; D003035:Cobalt; D015082:2,2'-Dipyridyl; C022838:nickel chloride; D009532:Nickel; C016837:zinc chloride; C018021:cobaltous chloride