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A selective optical sensor based on [9]mercuracarborand-3, a new type of ionophore with a chloride complexing cavityA highly selective optical sensor for chloride, based on the multidentate Lewis acid ionophore [9]mercuracarborand-3, is described herein. This sensor is constructed by embedding the mercuracarborand ionophore, a suitable pH-sensitive lipophilic dye, and lipophilic cationic sites in a plasticized polymeric membrane. The multiple complementary interactions offered by the preorganized complexing cavity of [9]mercuracarborand-3 is shown to control the anion selectivity pattern of the optical film. The film exhibits a significantly enhanced selectivity for chloride over a variety of lipophilic anions such as perchlorate, nitrate, salicylate, and thiocyanate. Furthermore, the optical selectivity coefficients obtained for chloride over other biologically relevant anions are shown to meet the selectivity requirements for the determination of chloride in physiological fluids, unlike previously reported chloride optical sensors. In addition, the optical film responds to chloride reversibly over a wide dynamic range (16 microM-136 mM) with fast response and recovery times.
Document ID
20040112740
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Badr, I. H.
(University of Kentucky Lexington 40506-0055, United States)
Johnson, R. D.
Diaz, M.
Hawthorne, M. F.
Bachas, L. G.
Daunert, S.
Date Acquired
August 21, 2013
Publication Date
September 15, 2000
Publication Information
Publication: Analytical chemistry
Volume: 72
Issue: 18
ISSN: 0003-2700
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Environmental Health
Non-NASA Center

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