基于1⁃(3,5⁃二羧基苄基)⁃1H⁃吡唑⁃3,5⁃二羧酸的钴(Ⅱ)配位聚合物的合成、结构、磁性和荧光传感性质

Synthesis,Structure,Magnetic,and Fluorescent Sensing Properties of Cobalt(Ⅱ)Coordination Polymer Based on 1⁃(3,5⁃Dicarboxybenzyl)⁃1H⁃pyrazole⁃3,5⁃dicarboxylic Acid

以1-(3,5-二羧基苄基)-3,5-吡唑二羧酸(H4L)为配体,采用水热法合成了1个三维钴配位聚合物[Co_(5)(L)_(2)(μ_(3)-OH)_(2)(H_(2)O)_(8)]_(n)(1),并通过单晶X射线衍射分析、元素分析、红外光谱分析和热重分析对其结构进行了表征。单晶结构分析表明配合物1属于三斜晶系,空间群为P-1。配合物1具有三维网状结构。分子中的3个Co(Ⅱ)离子都采取六配位模式,构成了轻微扭曲的八面体配位构型。通过变温磁化率测量发现,配合物1中的Co(Ⅱ)离子之间存在反铁磁相互作用。荧光传感实验表明配合物1对Hg^(2+)有高度的灵敏性和选择性荧光猝灭。此外,Co(Ⅱ)-CP传感器可用于延河水样中Hg^(2+)含量的测定。

A new coordination polymer(CP),[Co_(5)(L)_(2)(μ_(3)-OH)_(2)(H_(2)O)_(8)]_(n)(1)(H_(4)L=1-(3,5-dicarboxybenzyl)-1H-pyrazole-3,5-dicarboxylic acid),was synthesized by hydrothermal method and characterized by single-crystal X-ray diffraction,elemental analyses,infrared spectroscopic analysis,and thermogravimetric analysis.The crystallographic analysis indicates that complex 1 crystallizes in the triclinic system with a space group of P-1 and exhibits a 3D network structure.Each of the three Co(Ⅱ)ions in the molecule adopts a six-coordinated pattern,forming a slightly twisted octahedral coordination configuration.The variable temperature magnetic susceptibility measurements indicate that there are antiferromagnetic interactions between the Co􀃭ions in complex 1.The fluorescence sensing experiments demonstrate that complex 1 exhibits fluorescent quenching to Hg^(2+) with high sensitivity and selectivity.Additionally,the Co(Ⅱ)-CP sensor could be successfully used to assay the content of Hg^(2+) in Yanhe River water samples.CCDC:2102826.