Determination of surface pKa of pure mercaptoacetic acid and 2-mercaptobenzothiazole mixed monolayers by impedance titration

作者：Lu GH^*; Liu CY; Zhao HY; Liu W; Jiang LP; Jiang LY

来源：Chinese Chemical Letters, 2004, 15(7): 827-830.

• a.c.impedance titration
• mercaptoacetic acid
• 2-mercaptobenzothiazole
• self-assembled monolayers
• surface pKa

Interfacial proton transfer reactions of pure mercaptoacetic acid (MA) and 2-mercaptobenzothiazole (Mbz) mixed self-assembled monolayers (SAMs) have been studied using a.c. impedance titration method. The charge-transfer resistance (R-ct) is measured with the monolayer composition and the ionic strength of pH solution. The surface pKa can be obtained by the plots of R-ct and pH, the reasons of shifts of surface pKa are also explained.

• 出版日期2004-7
• 单位华中师范大学; 南宁师范大学