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Reference type: Journal
Authors: Gu AM, Lattes A, Laurent E, Mauzac M, Mingotaud AF
Article Title: Characterization of recognition sites for diethyl 4-nitrobenzylphosphonate, an organophosphate pesticide analogue.
Publication date: 2008
Journal: Analytica Chimica Acta
Volume: 614
Issue: (1)
Page numbers: 63-70.
DOI: 10.1016/j.aca.2008.03.016
Alternative URL: http://www.sciencedirect.com/science/article/B6TF4-4S2666P-7/1/436438d4153a5b356134cec161a39702

Abstract: In a first step towards chemical sensors using molecular imprinted materials, the complexing characteristics of diethyl 4-nitrobenzylphosphonate, an organophosphate pesticide analogue, have been studied. Two molecules have been assessed as potential interacting moieties, specifically a fluoroalcohol and an aromatic acid. The interactions have been first characterized by regular methods, such as 1H, 31P NMR and IR spectroscopy. These showed a stoichiometry 1/1 for both complexes and association constants, respectively, close to 4010 and 122M-1. In a second step, isothermal titration calorimetry was used and a method was developed to obtain low-association constants. The association constant could be obtained for the fluoroalcohol ligand and was found equal to 630.7M-1. For the acidic molecule, an appropriate model could not be found, preventing the evaluation of this constant
Author keywords: pesticides, isothermal titration calorimetry, molecular imprinted polymers, sensors

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