Assembly of N-hexadecyl-pyridinium-4-boronic acid hexafluorophosphate monolayer films with catechol sensing selectivity

Reference:

Huang, Y. J., Jiang, Y. B., Fossey, J. S., James, T. and Marken, F., 2010. Assembly of N-hexadecyl-pyridinium-4-boronic acid hexafluorophosphate monolayer films with catechol sensing selectivity. Journal of Materials Chemistry, 20 (38), pp. 8305-8310.

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Official URL:

http://dx.doi.org/10.1039/c0jm01510e

Abstract

The highly water insoluble N-hexadecyl-pyridinium-4-boronic acid hexafluorophosphate is synthesised and investigated for sensor applications. This amphiphilic molecule is immobilised by evaporation of an acetonitrile solution at a basal plane pyrolytic graphite (HOPG) electrode surface and is shown to provide a monolayer film. By varying the amount of deposit partial or full coverage can be achieved. The N-hexadecyl-pyridinium-4-boronic acid hexafluorophosphate monolayer acts as an active receptor for 1,2-dihydroxy-benzene (catechol) derivatives in aqueous media. The ability to bind alizarin red S is investigated and the Langmuirian binding constant determined as a function of pH. It is shown that the immobilised boronic acid monolayer acts as sensor film for a wider range of catechols. A comparison of Langmuirian binding constants for alizarin red S (1.4 x 10(5) mol(-1) dm(3)), catechol (8.4 x 10(4) mol(-1) dm(3)), caffeic acid (7.5 x 10(4) mol(-1) dm(3)), dopamine (1.0 x 10(4) mol(-1) dm(3)), and L-dopa (8 x 10(3) mol(-1) dm(3)) reveals that a combination of hydrophobicity and electrostatic interaction causes considerable selectivity effects.

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