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Study of cation transfer across the water/nitrobenzene interface facilitated by a synthetic neutral dicarboxamide
Author(s) -
Hu Zhongmin,
Zhang Weiqing,
Zhao Pingsan,
Qi Deyao
Publication year - 1995
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140070716
Subject(s) - ionophore , nitrobenzene , chemistry , cyclic voltammetry , inorganic chemistry , ion , potentiometric titration , analytical chemistry (journal) , electrochemistry , electrode , chromatography , organic chemistry , calcium , catalysis
The transfer of proton, alkali, and alkaline earth metal ions across the water/nitrobenzene interface, facilitated by a synthetic neutral dicarboxamide ionophore in the nitrobenzene phase was investigated using cyclic voltammetry. The ionophore‐facilitated transfer of Li + , Ca 2+ , and Ba 2+ ions showed cathodic current peaks, and the transfer of H + ions apparently resulted in peaks of both anodic and cathodic currents within the potential window. The transfer process of these ions was found to be controlled by the diffusion of the ionophore in the nitrobenzene. The formation of a 1 : 1 complex for H + and of 1 : 2 (cation to ionophore) complexes for Li + , Ca 2+ , and Ba 2+ ions was inferred, through peak separation or the dependence of the cathodic peak potential on the logarithm of the ionophore concentration, to be involved in the transfer process. The equilibrium constants K LI,M for the exchange reaction of the ion M Z+ with the Li‐ + ionophore complex at the water/nitrobenzene interface were evaluated and correlated with the potentiometric selectivity coefficients K Li,M Pot .