Structures and third-order nonlinear optical properties of two cobalt(II) coordination polymers constructed from bis(imidazol-l-yl-methyl)benzene and aromatic dicarboxylic ligands

• We have reported a cobalt(II) coordination polymer with 12.5% porosity.
• The NLO properties of two compounds were determined by z-scan technique.
• Two compounds show strong NLO properties with large susceptibility χ(3).

Two new cobalt(II) coordination polymers, {[Co(OBA)(1,3-bib)]2}n·H2O (1) and [Co(OBA)(1,2-bib)]n·H2O (2), (H2OBA = 4,4′-oxydibenzoic acid; 1, 3-bib = 1,3-bis(imidazol-l-yl-methyl)benzene; 1, 2-bib = 1,2-bis(imidazol-l-yl-methyl)benzene), have been obtained by the hydrothermal reactions. Compound 1 displays a two-dimensional grid net. Compound 2 exhibits a three-dimensional porous network with 12.5% porosity. Their third-order nonlinear optical (NLO) properties were determined by Z-scan technique in DMSO solution. Two compounds show strong third-order nonlinear optical absorption and self-focusing effects with absorptive coefficients β(MKS) 8.29 × 10− 11 m·W− 1 for 1 and 6.89 × 10− 11 m·W− 1 for 2, and the refractive indexes γ(MKS) 4.37 × 10− 18 m2·W− 1 for 1 and 5.22 × 10− 18 m2·W− 1 for 2. The third-order NLO susceptibility χ(3) are calculated to be 1.86 × 10− 11 for 1, 1.58 × 10− 11esu for 2. These values are larger than those of C60, phthalocyanine derivatives and semiconductor materials.

Two cobalt(II) coordination polymers are reported. Their third-order nonlinear optical properties were determined by Z-scan technique in DMSO solution. Two compounds show strong third-order nonlinear optical absorption and self-focusing effects, and the third-order NLO susceptibility χ(3) is calculated to be 1.86 × 10− 11 for 1, 1.58 × 10− 11esu for 2.Figure optionsDownload as PowerPoint slide