Unexpected complexation behaviour of a sol-gel immobilised dye: the development of an optical copper(II) sensor

Sommerdijk, Najm and Poppe, A. and Gibson, C.A. and Wright, J.D. (1998) Unexpected complexation behaviour of a sol-gel immobilised dye: the development of an optical copper(II) sensor. In: 3rd International Conference on Materials Chemistry (MC3), July 21-25, 1997 , University of Exeter, England. (The full text of this publication is not available from this repository)

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Official URL
http://dx.doi.org/10.1039/a708882e

Abstract

The metal-complexing dye Eriochrome Cyanine R (ECR) has been entrapped in sol-gel composites of good optical quality. The immobilisation of ECR had a dramatic effect on the complexation of metal ions. The strong colour change of aqueous ECR solutions, associated with the complexation of aluminium(III) ions, was not observed with ECR-containing composites. Instead a selectivity for copper(II) ions was found and a sensing system for these ions was developed. Thickness and pore structure were optimised to enhance sensitivity, lowering the detection limit for copper(II) ions to 0.1 ppm. The altered complexation behaviour is discussed in terms of effects of entrapment on entropy and enthalpy changes of complexation.

Item Type: Conference or workshop item (Paper)
Additional information: Proceedings paper
Subjects: Q Science > QD Chemistry
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group
Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: Tara Puri
Date Deposited: 01 Jul 2009 22:20
Last Modified: 01 Jul 2009 22:20
Resource URI: http://kar.kent.ac.uk/id/eprint/17160 (The current URI for this page, for reference purposes)
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