Citation: Guang Han LU, Chuan Yin LIU, Hong Yan ZHAO, Wei LIU, Li Ping JIANG, Ling Yan JIANG. Determination of Surface pKa of Pure Mercaptoacetic Acid and 2-Mercaptobenzothiazole Mixed Monolayers by Impedance Titration[J]. Chinese Chemical Letters, ;2004, 15(7): 827-830. shu

Determination of Surface pKa of Pure Mercaptoacetic Acid and 2-Mercaptobenzothiazole Mixed Monolayers by Impedance Titration

1.
College of chemistry, Central China Normal University, Wuhan 430079;
2.
Department of Chemistry, Yunyang Teacher's College, Danjiangkou Hubei 442700

Received Date: 23 July 2003

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.
- A.c.impedance titration,
- mercaptoacetic acid,
- 2-mercaptobenzothiazole,
- self-assembled monolayers,
- surface pKa
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