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- W2031337795 abstract "Abstract Water-insoluble alkylguanidines and cycloguanidines (triphenyl-, tricyclohexyl- and tribenzylguanidines) have been synthesized and studied as potential nitrate ligands. Anion-dependent expansion of dialkylguanidinium monolayers at the water/air interface is observed; the area per guanidinium molecule in the monolayer increases according to the series I−>NO3−>Cl−. Membranes for nitrate-sensitive electrodes are prepared by immobilization of alkyl- and cycloguanidiniums into a plasticized polyvinylchloride matrix. Nernst-type dependence of the electrode potential on the nitrate concentration is observed for the electrodes prepared with long-chain alkylguanidines, and only a small response is observed for electrodes based on the cycloguanidines. The selectivity qualitatively follows the Hofmeister series: I−>NO3−>Br−>F−. The effect of plasticizers on the dielectric constant of the membranes has been studied, and variations from 6.5 (dibutylphthalate) to 16 (tributylphosphate) are obtained. In spite of some quantitative variations of the electrode selectivity, the Hofmeister series is qualitatively valid for all the electrodes. No correlation between dielectric constant of the electrode membrane and electrode selectivity is observed." @default.
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- W2031337795 date "1996-06-01" @default.
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- W2031337795 title "Anion-sensitive properties of alkylguanidines in membrane electrodes and monomolecular layers" @default.
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- W2031337795 doi "https://doi.org/10.1016/s0925-4005(97)80032-9" @default.
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