Synthesis, Structures, and Properties of Two Coordination Polymers with Chelating Carboxylic and Triazolyl Derivatives

Resumo

Two coordination polymers, [Zn(Btec)_0.5(H₂L)]_n (I) and [Cd_0.5(Tp)_0.5(H₂L')(H₂O)]_n ∙ nH₂O (II) (H₂L = 3-(1H-pyrazol-4-yl)-5-(pyridin-2-yl)-1,2,4-triazole; H₄Btec = 1,2,4,5-benzenetetracarboxylic acid; H₂L' = 3-(1H-pyrazol-4-yl)-5-(pyridin-3-yl)-1,2,4-triazole; H₂Tp = terephthalic acid), have been synthesized under hydrothermal conditions. The title compounds were structurally characterized by elemental analysis, single crystal X-ray diffraction analysis, infrared spectra. Compounds I and II crystallize in the orthorhombic and triclinic, space group Pbca and P¯1, respectively. Compound I displays a two-dimensional plane structure, those are connected by N···H···O hydrogen bonds to generate 3D frameworks. Compound II is constructed a 1D chain structure by Tp²⁻ ligands, which are connected into 2D structure by the hydrogen bonds. In addition, the fluorescent property of I has been studied in the solid state at room temperature. The thermal analysis of I has also been investigated.