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Chromogenic silica nanoparticles for the colorimetric sensing of long-chain carboxylates

Pilar Calero1, Elena Aznar, J Manuel Lloris

  • 1Instituto de Química Molecular Aplicada, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain.

Chemical Communications (Cambridge, England)
|March 28, 2008
PubMed

Abstract:

Silica nanoparticles functionalized with chromogenic spirobenzopyran and thiourea subunits show selective colour changes in the presence of certain long-chain carboxylates.

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Labeling DNA Probes03:31

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However, the stretching absorptions for the C=O bond vary depending on the structure of carboxylic acids. The C=O bond of the free carboxylic acids shows a higher stretching frequency, 1760 cm−1, while H-bonded carboxylic acids (dimers) exhibit stretching absorptions at a lower frequency, 1710 cm−1. The C=O bond of the...

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