Exploiting the κ<sup>2</sup>‐Fashioned Coordination of [Se<sub>2</sub>]‐Donor Ligand L<sub>3</sub>Se for Facile Hg−C Bond Cleavage of Mercury Alkyls and Cytoprotection against Methylmercury‐Induced Toxicity
作者:Ramesh Karri、Ashish Chalana、Binayak Kumar、Sri Krishna Jayadev、Gouriprasanna Roy
DOI:10.1002/chem.201902578
日期:2019.10
coordinate through κ2 -fashion, in which both the Se atoms simultaneously attack the Hg center of mercury alkyls for facile Hg-C bond cleavage. It has the highest softness (σ) parameter and the lowest HOMO(Ln Se)-LUMO(MeHgX) energy gap and, thus, L3 Se is the most reactive among Ln Se towards MeHgX (X=Cl or I). L3 Se is highly efficient, more than L1 Se, in restoring the activity of antioxidant enzyme glutathione
众所周知,MeHgCl的Hg-C键是一种普遍存在的环境毒物,它是惰性的,并且极难裂解。因此,MeHgCl的Hg-C键在低温下的裂解对人类健康至关重要。在各种双(咪唑)-2-硒酮Ln Se(n = 1-4或6)中,三间隔L3 Se在包括MeHgCl在内的各种汞烷基的降解中显示出极高的反应活性,因为它具有独特的配位能力κ2-形式,其中两个Se原子同时攻击汞烷基的Hg中心,以实现容易的Hg-C键裂解。它具有最高的柔软度(σ)参数和最低的HOMO(Ln Se)-LUMO(MeHgX)能隙,因此,L3 Se在Ln Se中对MeHgX的反应性最高(X = Cl或I)。L3 Se比L1 Se高效率 恢复被MeHgCl完全抑制的抗氧化酶谷胱甘肽还原酶(GR)的活性;L3 Se可回收80%的GR活性,而L1 Se可回收50%的GR活性。通过保护重要的抗氧化酶不受MeHgCl引起的抑制作用,它在肝细胞中具有出