Issue 3, 2013
From the journal:

New Journal of Chemistry

Optical detection of anions using N-(4-(4-nitrophenylazo)phenyl)-N′-propyl thiourea bound silica film†

Ryo Kato,a   Akinori Kawaib  and  Toshiaki Hattoribc  

a Cooperative Research Facility Center, Toyohashi University of Technology, Toyohashi, Japan
E-mail: rk001@edu.imc.tut.ac.jp

b Department of Materials Science, Toyohashi University of Technology, Toyohashi, Japan

c Department of Electrical & Electronic Information Engineering, Toyohashi University of Technology, Toyohashi, Japan

Abstract

The anion-sensing properties of N-(4-nitrophenylazo)-N′-propyl thiourea chromoionophores have been investigated as free agents in bulk solution and following immobilization on a sol–gel silica film. In addition, the effect of a variety of organic spacers on the immobilized chromoionophores was examined. The binding constants of free chromoionophores with anions were greater than those of the corresponding immobilized chromoionophores in acetonitrile solution and their binding constants revealed a trend were CH3CO2− > H2PO4− > Cl−. However, the use of an organic spacer with an immobilized chromoionophore can change the binding constants of anions. An octadecyl group spacer, for example, led to an increase in the difference between the binding constants of the acetate ion and other anions and also enhanced selectivity for the acetate ion.

Graphical abstract: Optical detection of anions using N-(4-(4-nitrophenylazo)phenyl)-N′-propyl thiourea bound silica film

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Article information

DOI
https://doi.org/10.1039/C2NJ40714K
Article type
Paper
Submitted
11 Aug 2012
Accepted
07 Dec 2012
First published
10 Dec 2012

New J. Chem., 2013,37, 717-721

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Optical detection of anions using N-(4-(4-nitrophenylazo)phenyl)-N′-propyl thiourea bound silica film

R. Kato, A. Kawai and T. Hattori, New J. Chem., 2013, 37, 717 DOI: 10.1039/C2NJ40714K

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