Sodium-selective compositions and electrodes containing same

Details Sodium-selective compositions and electrodes containing same Sodium-selective compositions and electrodes containing same

1983-05-20

1985-03-19

Kaplan, G. L.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

549348, G01N 2730

Patent

active

045058008

ABSTRACT:
Ion-selective compositions which comprise an ion carrier, a compound capable of solvating the ion carrier, and a supporting matrix are disclosed. The ion carrier useful in this invention is a hemispherand compound represented by the structure: ##STR1## wherein X.sub.1, X.sub.2, X.sub.3 and X.sub.4 are independently alkyl or alkenyl, or any one of X.sub.1, X.sub.2, X.sub.3 and X.sub.4 is taken with one of the others of X.sub.1, X.sub.2, X.sub.3 and X.sub.4 to form an alkylene group or an alkylene group interrupted with hetero atoms; and R represents the atoms necessary to complete a macrocyclic ring structure having from 16 to 19 atoms in the backbone of the ring structure, with the proviso that R contains (a) at least one coordinating site for sodium ions and (b) at least two alkylene groups as part of the ring structure. These compounds and the compositions containing same are particularly useful in ion-selective electrodes. Such an electrode is capable of selectively transporting sodium ion in preference to other cations. Dry-operative electrodes using these ion-selective compositions as membranes are also disclosed.

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