Experimental and theoretical studies of hydrolysis of nerve agent sarin by binuclear zinc biomimetic catalysts
作者:Nan Guo、Jin-Yi Zhong、Shi-Lu Chen、Jing-Quan Liu、Qi Min、Rui-Xue Shi
DOI:10.1016/j.chemphys.2015.05.011
日期:2015.8
nucleophilic attack and the overall hydrolysis of GB. It was shown that ZnL2 had a very high catalytic efficiency for the hydrolysis of GB, with kcat/Km = 0.11 s−1 M−1 at 303 K and about 90% conversion in 30 min. The following DFT calculations proposed a detailed reaction mechanism of ZnL2 and gave an energy barrier (5.8 kcal M−1) very close to the experimental activation energy (5.6 kcal M−1). In this
官能化的2,2-(2-羟基-5-甲基-1,3-亚苯基)双(亚甲基)双((吡啶-2-基甲基)氮杂二基)二乙醇的络合物(ZnL1)具有两个Zn(II)中心的化合物,以前曾被建议是双核磷酸锌三酯酶(PTE)的结构模型,并被证明是水解双(2,4-二硝基苯基)磷酸酯(BDNPP)的有效催化剂。在本文中,ZnL1进一步发现具有用于异丙methylphosphonofluoridate(沙林,GB)与水解的高催化活性ķ猫/ ķ米 = 0.051小号-1 中号-1在303 K,通过现场NMR分析检查。随后的密度泛函理论(DFT)计算表明末端醇盐(O tZn结合)可以作为激活水分子的一般碱,然后由后者衍生的氢氧化物对GB中的荧光粉进行初始亲核攻击。受此机理的启发,设计并合成了一种新型的仿生催化剂,方法是用羟基取代ZnL1的两个吡啶,即两个Zn(II)与2,6-双((双(2-羟乙基)氨基)甲基的络合物) -4