Matrix effects on selective chemical sensing by sol-gel entrapped complexing agents

Sommerdijk, Nico A. J. M. and Wright, John D. (1998) Matrix effects on selective chemical sensing by sol-gel entrapped complexing agents. Journal of Sol-Gel Science and Technology, 13 (1-3). pp. 565-568. ISSN 0928-0707. (The full text of this publication is not available from this repository)

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Official URL
http://dx.doi.org/10.1023/A:1008630924554

Abstract

Changes in the selectivity of molecular recognition systems on sol-gel entrapment are reported. Thermodynamic effects are exemplified by studies of the metal-ion complexing agent Eriochrome Cyanine R (ECR). In aqueous solution this binds strongly and selectively to Al3+, whereas in a TMOS-based sol-gel matrix it is selective for CU2+. Thermodynamic effects, due to restricted translational freedom of water molecules or different solvent structure and isolation of ligands, can explain these observations. Effects of entrapment on molecular recognition by a large conformationally flexible molecule have been studied using a tr-is-terminated PAMAM dendrimer. The dendrimer conformation and its complexation with CU2+ changes on entrapment, and binding of aromatic carboxylic acids such as ibuprofen can be detected by changes in visible absorption and surface plasmon resonance using spun films of the sol-gel composite. These effects show that in addition to providing a porous entrapment matrix of good optical quality, sol-gels may be used to alter the binding characteristics of the entrapped receptors.

Item Type: Article
Uncontrolled keywords: composites; chemical sensing; spectrophotometry; surface plasmon resonance
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 17:13
Last Modified: 25 Jun 2014 14:04
Resource URI: http://kar.kent.ac.uk/id/eprint/17162 (The current URI for this page, for reference purposes)
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