251. Coordination frameworks constructed from bipyridyl piperazine and MCl2 (M = Co, Ni, Zn): structural characterization and optical properties.
- Author
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Xu H, Song Y, Mi L, Hou H, Tang M, Sang Y, Fan Y, and Pan Y
- Subjects
- Crystallography, X-Ray, Hydrogen Bonding, Ions, Ligands, Metals chemistry, Molecular Conformation, Molecular Weight, Piperazine, Polymers chemistry, Ultraviolet Rays, X-Rays, 2,2'-Dipyridyl chemistry, Chlorides chemistry, Cobalt chemistry, Nickel chemistry, Piperazines chemistry, Zinc Compounds chemistry
- 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.
- Published
- 2006
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