摘要
采用线性扫描伏安法和循环伏安法研究了 4′ ,7 二甲氧基 3′ 异磺酮磺酸钠 (Sodium 4′ ,7 dimethoxy 3′ isoflavonesulfonate ,SDIS)在pH =1.0～ 12 .0的水溶液中的电化学行为 .实验结果表明 :在pH =1.0～ 5 .0条件下所获得的Pc1 ,Pc2 波分别为SDIS的单质子单电子不可逆还原波及还原中间体自由基的单电子单质子不可逆还原波 ;在 5 <pH <8条件下所获得的Pc1 波 ,仍属于SDIS单电子单质子不可逆还原波 ,而还原中间体自由基的单电子波被氢波掩盖 ;在pH >8.0的 0 .2mol·L-1 Britton Robinson缓冲溶液中所获得的Pc1 ,Pc2
The electrochemical behavior of sodium 4′,7 dimethoxy 3′ isoflavone sulfonate (SDIS) in aqueous medium from pH 1.0 to 12.0 was investigated with linear sweep voltammetry and cyclic voltammetry. Experimental results showed that SDIS could cause two reductive waves in different range of pH. In pH 1.0～8.0, the carbonyl group CO in SDIS underwent a 1e - and 1H + reduction to form a neutral free radical, and then 1e - and 1H + reduction of the free radical happened, but the wave of reduction species radical of SDIS was covered because of a discharge of hydrogen ion into the electrolyte solution in pH=5.1 to 8.0. In 0.2 mol·L -1 Britton Robinson buffer solution of pH>8.0, SDIS could cause two reduction waves. The former was an irreversible wave of promoted SDIS involving 1e - and the latter was also an irreversible wave of reduction species radical of SDIS involving 1e - and 1H +.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2004年第11期1071-1074,M005,共5页
Acta Chimica Sinica
基金
国家自然科学基金 (No.2 0 2 750 30 )
教育部科学技术研究重点项目 (No.0 2 1 87)
教育部高等学校骨干教师资助计划 (No.GG 1 50 71 0 0 6 2 877)
陕西省教育厅专项科研基金 (No .0 1JK0 76)资助项目
