Abstract

Three coordination polymers, {[Ni(H2O)2(bib)2]-(H2BTA)·2H2O} n (1), {[Co2(bib)2(BTA)]·H2O} n (2), and {[Co2(bib)2(CA)2]·H2O} n (3), (H4BTA = biphenyl-3,3′,4,4′-tetracarboxylic acid; bib = 1, 2-bis(imidazol-l-yl-methyl)benzene; H2CA = camphanic acid), have been synthesized under hydrothermal conditions. In complex 1, bib serves a bridging ligand to link two Ni(II) atoms into an infinite joint-like chain. In 2, binuclear units are connected by BTA and bib ligands to form 2-D sheets. In 3, each Ni(II) atom is coordinated with two bib ligands to give a 22-membered ring, which is further linked by CA ligands to form a ladder-like chain. The third-order nonlinear optical (NLO) properties of the complexes were determined by Z-scan technique in DMSO solution. All three complexes exhibit strong third-order NLO absorption with absorptive coefficients β(MKS) 1.44 × 10−10 m W−1 for 1, 1.68 × 10−10 m W−1 for 2, and −6.31 × 10−10 m W−1 for 3, respectively, of which compound 3 shows saturable absorption. The third-order NLO susceptibilities |χ (3)| were calculated as 0.32 × 10−10 for 1, 0.37 × 10−10 for 2, and 1.39 × 10−10 esu for 3, while the hyperpolarizabilities γ′ are 9.95 × 10−29 for 1, 5.85 × 10−29 for 2 and 4.64 × 10−28 esu for 3, respectively.

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