Electrochemical Behavior and Characterization of Semiquinone Radical Anion Species of Coenzyme PQQ in Aprotic Organic Media
作者:Shinobu Itoh、Hirokatsu Kawakami、Shunichi Fukuzumi
DOI:10.1021/ja9813663
日期:1998.7.1
Electrochemical behavior of coenzyme PQQ has been investigated in aprotic organic solvents using the trimethyl ester of PQQ (1oxH, trimethyl 4,5-dihydro-4,5-dioxo-1H-pyrrolo[2,3-f]quinoline-2,7,9-tricarboxylate) and its 1-methylated derivative (1oxMe, trimethyl 4,5-dihydro-4,5-dioxo-1-methylpyrrolo[2,3-f]quinoline-2,7,9-tricarboxylate). 1oxH shows a complicated cyclic voltammogram in organic media
使用 PQQ 的三甲酯(1oxH,三甲基 4,5-二氢-4,5-二氧-1H-吡咯并[2,3-f]喹啉-2,7, 9-tricarboxylate) 及其 1-甲基化衍生物 (1oxMe, trimethyl 4,5-dihydro-4,5-dioxo-1-methylpyrrolo[2,3-f]quinoline-2,7,9-tricarboxylate)。1oxH 显示了有机介质(CH2Cl2、MeCN 和 DMSO)中复杂的循环伏安图;至少有三个还原峰和四个氧化峰。1oxH 在 -0.9 V 附近的第一个不可逆还原峰与二茂铁/二铁 (Fc/Fc+) 非常接近 1oxMe 的可逆还原峰。将等摩尔量的乙酸添加到 1oxMe 溶液中,导致 1oxMe/1radMe- 的可逆单电子氧化还原对变为不可逆的,如在 1oxH 中观察到的。