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.
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