Free radical induced one-electron oxidation of the phenothiazines chlorpromazine and promethazine
作者:Detlef Bahnemann、Klaus-Dieter Asmus、Robin L. Willson
DOI:10.1039/p29830001661
日期:——
protonated forms of chlorpromazine and promethazine, CZH+ and PZH+, with the electrophilic radicals ˙OH, Br2–˙, (SCN)2–˙, I2–˙, N3˙, TI2+, TI(OH)+, (t-C4H9S t-C4H9)+˙, (CH3SSCH3)+˙, and lipoate+˙ in the pH range 2–8. Values for these one-electron oxidations vary from k= 3.1 × 108 mol–1 dm3 s–1 for [(t-C4H9S t-C4H9)+˙+ PZH+] to 5.5 × 109 mol–1 dm3 s–1 for (Br2–˙+ CZH+). The yields of the oxidation products, PTZH2+˙
已测量了氯丙嗪和异丙嗪,CZH +和PZH +的质子化形式与亲电子基团˙OH,Br 2 - ˙,(SCN)2 - ˙,I 2 - ˙,N 3的反应的绝对速率常数。˙,TI 2 +,TI(OH)+,(tC 4 H 9 S tC 4 H 9)+ ˙,(CH 3 SSCH 3)+ ˙和lipoate + ˙在pH范围2–8中。这些单电子氧化的值从k开始变化= 3.1×10 8摩尔-1分米3个小号-1为[(TC 4 ħ 9小号的tC 4 H ^ 9)+ ˙+ PZH + ]到5.5×10 9摩尔-1分米3个小号-1为(BR 2 - C + CZH +)。氧化产物的产率,PTZH 2+ ˙,变化从28%为(OH + CZH +为[(SCN)),以97%的2 ˙ - + CZH + ]。PTZH 2+˙自由基阳离子显示特征吸收光谱,两个最大值分别在270和510 nm附近,消光系数Φ(CZH 2 + ˙)=