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Synthesis and potentiometric selectivity study of acyclic formazanes
Author(s) -
Attiyat A. S.,
Badawy M. A.,
Barsoum B. N.,
Hanna H. R.,
Ibrahim Y. A.,
Christian G. D.
Publication year - 1991
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.1140030614
Subject(s) - selectivity , potentiometric titration , chemistry , ionophore , plasticizer , ether , lithium (medication) , inorganic chemistry , sodium , nuclear chemistry , organic chemistry , ion , calcium , catalysis , medicine , endocrinology
Seven compounds of a new class of ionophores, acyclic formazanes, were synthesized and tested for the potentiometric selectivity for lithium ion, in polyvinyl chloride (PVC) membrane electrodes. Four different plasticizers were studied: o ‐nitrophenyloctyl ether (NPOE), o nitrophenylphenyl ether (NPPE), o ‐nitrophenylbutyl ether (NPBE), and o ‐nitrophenylbenzyl ether (NPBnE), as was the addition of trioctylphosphine oxide (TOPO). The ionophore, 1, 5‐bis‐( o ‐butoxyphenyl)−3‐cyanoformazane ( IIB ) exhibited sodium–lithium selectivity, K pot Li, Na , of 6.2 × 10 −3 by the matched potential method in the presence of 1% TOPO using NPPE plasticizer. The presence of TOPO generally causes a substantial increase in the lithium selectivity. Selectivities with respect to the lithium ion are reported for sodium, potassium, ammonium, barium, and calcium ions.