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首页> 外文期刊>RSC Advances >Solvent-induced construction of two zinc supramolecular isomers: synthesis, framework flexibility, sensing properties, and adsorption of dye molecules
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Solvent-induced construction of two zinc supramolecular isomers: synthesis, framework flexibility, sensing properties, and adsorption of dye molecules

机译：溶剂诱导的两种锌超分子异构体的构建：合成，构架柔韧性，传感特性和染料分子的吸附

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摘要

Two zinc supramolecular isomers, formulated as α-[Zn(cis-cppca)(H2O)]n (1) and β-[Zn(trans-cppca)(H2O)]n (2), have been synthesized under solvothermal conditions and fully characterized (H2cppca = 5-(3-carboxy-phenyl)-pyridine-2-carboxylic acid). Solvent-induced conformational isomerism of cppca2? ligand and framework isomerism of 1 and 2 are both observed. Each distorted [Zn(cis-cppca)]2 unit joined four equivalent ones in an abnormal 2D puckered layer in compound 1; however, compound 2 displays a 3-D open framework with larger bi-edge channels constructed by 1D Zn–O–Zn chains and trans-cppca bridges, in which the internal edge is a nearly hexagonal channel with an approximate dimension of 14.51 ? and the external edge is a circular channel with an approximate dimension of 19.26 ?. Fluorescent properties indicated that compound 1 displays an apparent fluorescence emission in acetone solvent; however, compound 2 was very sensitive to acetone molecules which results in nearly 100% fluorescence quenching. Moreover, compounds 1 and 2 might be promising luminescent probes for the detection of Fe3+. The dye adsorption experiments demonstrated that compound 2 showed good adsorption properties for MB and RhB molecules.
机译：两种锌超分子异构体，配制成α-[Zn（ cis -cppca）（H 2 O）] < em> n （1）和β-[Zn（ trans -cppca）（H 2 O）] n （small）（2），已在溶剂热条件下合成并完全表征（H 2 < / sub> cppca = 5-（3-羧基-苯基）-吡啶-2-羧酸）。观察到了溶剂诱导的cppca 2？ 配体的构象异构以及构架异构体1和2。每个扭曲的[Zn（ cis -cppca）] 2 单元在化合物1的异常2D褶皱层中连接了四个等效单元;然而，化合物2显示的3-D开放框架具有较大的双边缘通道，该通道由一维Zn–O–Zn链和 trans -cppca桥构成，其中内部边缘为几乎六边形的通道，具有近似尺寸为14.51？外边缘是一个圆形通道，尺寸约为19.26？。荧光性质表明，化合物1在丙酮溶剂中显示出明显的荧光发射。然而，化合物2对丙酮分子非常敏感，这导致近100％的荧光猝灭。此外，化合物1和2可能是检测Fe 3 + 的有前途的发光探针。染料吸附实验表明，化合物2对MB和RhB分子具有良好的吸附性能。

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