Abstract
AbstractSeven 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, KpotLi, 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.
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