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

摘要

Oxovanadium complex [VO(C6H9O2)(Tp4I)]·2H2O(Tp4I =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 ×10 2 ( mol/L ) -2· s-1 .Meanwhile , the reaction system was applied in the hydrogen peroxide determination.%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）（Tp4I）]·2H2O（Tp4I ＝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（Tp4I）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。