Synthesis and characterization of sterically and electrostatically shielded pyrrolidine nitroxide radicals
作者:Lisa Lampp、Uwe Morgenstern、Kurt Merzweiler、Peter Imming、Rüdiger W. Seidel
DOI:10.1016/j.molstruc.2019.01.015
日期:2019.4
Abstract Two new pyrrolidine nitroxide radicals, cis/trans-2,5-bis(carboxymethyl)-2,5-diethylpyrrolidine 1-oxyl and 2-(carboxymethyl)-2,5,5-triethylpyrrolidine 1-oxyl, for potential applications as spin probes and labels are reported. Carboxymethyl and ethyl groups have been introduced in the α-positions of the nitroxide group in order to improve the stability of the radicals through steric and electrostatic
摘要 两个新的吡咯烷氮氧自由基,cis/trans-2,5-bis(carboxymethyl)-2,5-diethylpyrrolidine 1-oxyl 和 2-(carboxymethyl)-2,5,5-triethylpyrrolidine 1-oxyl,潜在的应用报告了自旋探针和标记。为了通过空间和静电屏蔽提高自由基的稳定性,已在硝基氧基团的 α 位引入羧甲基和乙基。通过X射线晶体学和EPR光谱对化合物进行结构表征。抗坏血酸还原试验证明,新合成的自由基比众所周知的市售氮氧自由基 3-羧基-PROXYL 和 4-羧基-TEMPO 具有更高的还原稳定性。