TY - GEN A1 - Hayessen, R. A1 - Mirsky, Vladimir M. A1 - Heckmann, Klaus Dietrich T1 - Anion-sensitive properties of alkylguanidines in the membrane electrodes and monomolecular layers T2 - Sensors and Actuators B: Chemical N2 - 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. KW - Alklyguanidines KW - Anion selectivity KW - Cycloguanidines KW - Membrane electrodes KW - Monomolecular layers Y1 - 1996 U6 - https://doi.org/10.1016/S0925-4005(97)80032-9 SN - 0925-4005 VL - 32 IS - 3 SP - 215 EP - 220 ER -