Synthesis, Characterization, X-ray Crystal Structure, DFT Calculations, and Catalytic Properties of a Dioxidovanadium(V) Complex Derived from Oxamohydrazide and Pyridoxal: A Model Complex of Vanadate-Dependent Bromoperoxidase
作者:Chandrima Das、Piyali Adak、Satyajit Mondal、Ryo Sekiya、Reiko Kuroda、Serge I. Gorelsky、Shyamal Kumar Chattopadhyay
DOI:10.1021/ic501216d
日期:2014.11.3
determined by X-ray crystallography. The O4N coordination environment of vanadium and the hydrogen-bonding abilities of the pendant amide moiety have a strong resemblance with the vanadium center in bromoperoxidase enzyme. Bromination experiments using H2O2 as the oxidizing agent, with model substrate phenol red, and the vanadium complex as a catalyst show a remarkably high value of kcat equal to 26340 h–1
具有新的三齿配体2- [2-[[3-羟基-5-(羟甲基)-2-甲基吡啶]的具有式[Et 3 NH] [V V O 2(sox-pydx)]的钒(V)配合物通过草酰肼与吡ido醛(维生素B 6的一种形式)缩合获得的-4--4-基]亚甲基]肼基] -2-氧乙酰胺(soxH-pydxH)),已经合成。通过多种分析和光谱方法表征该化合物,并通过单晶X射线衍射技术确定其结构。密度泛函理论(DFT)和与时间有关的DFT计算被用来了解络合物的电子结构以及在UV-vis光谱中观察到的电子跃迁的性质。在该络合物中,发现钒(V)与两个氧化配体和一个双阴离子三齿ONO供体配体五配位。钒中心具有带有轴向氧化配体的方锥几何形状,并且赤道位置被另一氧化配体和配体的酚基氧,亚胺氮和去质子化的酰胺氧占据。DFT优化的复合物结构显示出非常相似的度量参数,如通过X射线晶体学测定的。O钒的4 N配位环境和酰胺侧基的氢键结合能力