聚吡唑硼酸盐钒氧配合物的合成及对苯酚红催化溴化活性

在室温溶液反应中设计合成了一个新的三聚-4碘代吡唑硼酸的钒氧配合物:VO(C₆H₉O₂)(Tp^4I)]·2H₂O(Tp^4I=三聚-4-碘代吡唑硼酸盐)。 通过元素分析、红外光谱、紫外光谱、热重、X射线粉末和单晶衍射等技术手段对其结构进行了表征。 以苯酚红为底物,在过氧化氢的存在下,进行仿生催化溴化的研究。 结构分析表明,中心金属钒为6配位,与配位原子形成了一个八面体几何构型。 配体三聚4-碘吡唑硼酸盐(Tp^4I)采取三齿螯合配位模式。 在仿生催化溴化实验中,配合物对苯酚红的溴化氧化反应表现出良好的催化活性,催化该反应体系的反应速率常数达到k=2.826×10² (mol/L)^-2·s^-1。 同时将此反应体系应用于过氧化氢的检测。

Synthesis and Phenol Red Catalytic Bromination Activity of Polypyrazole Borate Oxovanadium Complex

Oxovanadium complex VO(C₆H₉O₂)(Tp^4I)]·2H₂O(Tp^4I=tri-(4-lodopyrazole)borate) was designed and synthesized. The spectral and structural characters of the complex were analyzed by elemental analysis, IR spectroscopy, UV spectroscopy, thermogravimetric analysis, X-ray powder diffraction and single crystal X-ray diffraction analysis. The structural analysis shows that the complex has an octahedron geometry with hexa-coordinated metal. Ligand tri-(4-lodopyrazole)borate adopts a tridentate chelating coordination mode. The complex exhibits good catalytic activity in the mimic bromination of phenol red, and the reaction rate constant is 2.424×10² (mol/L)^-2·s^-1. Meanwhile, the reaction system was applied in the hydrogen peroxide determination.