In Situ Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy of Carboxylate-Bearing, Siloxane-Anchored, Self-Assembled Monolayers: A Study of Carboxylate Reactivity and Acid-Base Properties

Shih Song Cheng, Daniel Alberto Scherson, Chaim N. Sukenik

Research output: Contribution to journalArticle

65 Citations (Scopus)

Abstract

Fourier transform infrared spectroscopy in the internal reflectance (attenuated total reflectance) mode (ATR-FTIR) has been applied to the study of carboxylate functionalized thin films. Both the monitoring of the self-assembly of an alkyl carboxylate-bearing siloxane-anchored monolayer and the use of pH difference spectra to directly assess (in situ) the acid-base properties of such a functionalized film have been achieved and are reported herein. This work has shown that the effective pKa of carboxylic acid groups in such an assembly varies linearly with the coverage of the ionized carboxylate, with a limiting value of 5.4 as this coverage approaches zero. This acid-base behavior is in agreement with that reported for other carboxylic acid bearing surfaces, as determined by a variety of other techniques.

Original languageEnglish
Pages (from-to)1190-1195
Number of pages6
JournalLangmuir
Volume11
Issue number4
DOIs
Publication statusPublished - 1995 Apr 1
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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