Three different kinds of cyclic imides with imido protons are chosen to interact with Hg(II): succinimide, the simplest cyclic imide (five-membered ring); phthalimide (conjugated five-membered ring); and 1,8-naphthalimide (conjugated six-membered ring). Based on the results of MS, 1H-NMR, XPS, IR spectroscopy and fluorescence response analyses, it is suggested that N-unsubstituted cyclic imides react specifically with Hg(II) and form imide-Hg-imide complexes through an imido proton–metal exchange process. The reaction is reversible and occurs rapidly at moderate to high pH. This discovery expands the comprehension of the specific interaction of Hg(II) with the nucleobase thymine, and may open up new possibilities in designing novel ligands for sensing and removing Hg(II) based on cyclic imides.
本研究选择了三种不同的带有亚
氨基质子的环状
亚胺与 Hg(II)发生反应:琥珀
酰亚胺,最简单的环状
亚胺(五元环);邻苯二甲
酰亚胺(共轭五元环);以及 1,8-
萘酰亚胺(共轭六元环)。根据 MS、1H-NMR、XPS、IR 光谱和荧光反应分析的结果,N-未取代环状
亚胺与 Hg(II)发生了特异性反应,并通过
亚胺质子-
金属交换过程形成
亚胺-Hg-
亚胺复合物。该反应是可逆的,并在中高 pH 值条件下迅速发生。这一发现拓展了人们对 Hg(II)与核碱基胸腺
嘧啶特异性相互作用的理解,并为设计基于环状
亚胺的新型
配体来感知和清除 Hg(II)提供了新的可能性。