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Planned Activities
The relationship between the length of the carbon chain and the degree of quenching/enhancement for the aza-crowns and pyrene will be further investigated. Likewise the quenching observed in benzocrowns substituted with cyano anthracene will be defined. A suitable fluorescence enhancement mechanism will be established with simple crowns prior to preparing more complex calix crown derivatives. We will also begin evaluation of the polymeric organic matrix that will be used to attach the ionophores to the fiber optic including the necessity of adding modifiers. This evaluation will initially use the fluorescence quenching following Cs+ complexation of the ligand calix[4]-bis-(2,3- naphtho-crown-6). The objective is to maximize both selectivity and loading as a function of matrix variation. When the ligands with fluorescence turn-on upon metal ion binding have been characterized in solution, studies will begin with the materials embedded in the optimized polymeric matrix. At this stage pattern recognition analysis of the response to complex solutions will begin using an array of selective ligands attached to an imaging fiber optic bundle. If appropriate, different modifiers/ polymers will be utilized for different selectivities/loading. If the research proceeds as expected, the goal is to test an imaging fiber with an array of sensor sites selective for Cs, Na, and K. Other Access To Information Hai-Feng Ji, R.Dabestani, and G.M.Brown, "Fluorescence Probes for the Detection of Potassium Ions," to be presented at the American Chemical Society National Meeting, Boston, MA.
Brown, G. M.; Dabestani, R.; Bonnesen, P. V. & Walt, D. R.Optically-based array sensors for selective in situ analysis of tank waste. 1998 annual progress report,
report,
June 1, 1998;
Tennessee.
(https://digital.library.unt.edu/ark:/67531/metadc628144/m1/3/:
accessed April 18, 2024),
University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu;
crediting UNT Libraries Government Documents Department.