A pH-Sensitive Supramolecular Switch Based on Mixed Carboxylic Acid Terminated Self-Assembled Monolayers on Au(111)

Langmuir : the ACS Journal of Surfaces and Colloids
Daniela K JacquelínE M Patrito

Abstract

We show that homogeneously mixed self-assembled monolayers (SAMs) of mercaptoalkanoic acids of different chain lengths can be used to build up a pH-sensitive supramolecular switch. The acids with short and long alkyl chains interact via the strong hydrogen bond between carboxylic acid groups. The pH acts as a trigger by breaking or restoring the hydrogen bond interaction in basic or acidic solutions, respectively. The corresponding changes in the monolayer structure were determined by ellipsometry, surface-enhanced Raman spectroscopy, and contact angle measurements. Density functional theory (DFT) calculations were performed to elucidate the structures of interacting molecules compatible with the surface coverage obtained from electrochemical reductive desorption experiments. The simplicity of the preparation procedure assures a high reproducibility whereas the stability of the homogeneous mixed SAM guarantees the reversibility of the switching process.

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Citations

Sep 16, 2016·Journal of Colloid and Interface Science·Zahra BesharatMark W Rutland
Aug 10, 2017·Chemical Communications : Chem Comm·Debabrata SamantaMichael Schmittel
May 18, 2021·Chemical Science·Han-Wen ChengChuan-Jian Zhong
Nov 11, 2020·The Journal of Physical Chemistry. a·A V Pinto, A L Magalhães
Nov 13, 2020·The Journal of Physical Chemistry Letters·Cai-Ping TaoXiao-Shun Zhou
Nov 14, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·T Rios-CarvajalT Hassenkam

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