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Transport Properties of H + ‐Selective Membranes Containing Amine‐Derivative Ionophores and Mobile Sites
Author(s) -
Nahir Tal M.,
Buck Richard P.
Publication year - 1993
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19930760124
Subject(s) - chemistry , tetraphenylborate , membrane , ionophore , aqueous solution , absorbance , ionic bonding , inorganic chemistry , amine gas treating , proton transport , chronoamperometry , analytical chemistry (journal) , chromatography , ion , organic chemistry , cyclic voltammetry , electrochemistry , biochemistry , electrode
Transport processes in plasticized PVC membranes containing the H + chromoionophore ETH 5294 and additional tetraphenylborate‐type mobile sites were analyzed by employing the potential‐step method. Using chronoamperometry, impedance spectroscopy, and UV/VIS absorbance measurements, it is shown that the ionophore behaves as a carrier for protons, when the membranes are immersed between two aqueous solutions. It was possible to document the changes in the concentration profiles of both free ionophores and ionic species in some of the membranes. There is no evidence of proton hopping between the ionophores.