Hemispherands and sodium-selective compositions and electrodes containing same
US4476007A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 1983 |
| Grant date | Oct 9, 1984 |
| Priority date | — |
| Expiry date | May 20, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/3335
- WIPO fieldMeasurement
- WIPO sectorInstruments
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 carriers of this invention are hemispherand compounds represented by the formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are independently hydrogen, alkyl, alkenyl, cycloalkyl, aryl or a heterocyclic group; and X is benzyl or an electron donating group capable of forming at least one coordinating site for sodium ions. A preferred hemispherand according to this invention is 2'-benzyloxy-3,3"-[2,6-pyridylenebis(methyleneoxymethylene)]-2,2"-tetramet hylenedioxy-5,5',5"-trimethyl-1,1':3',1"-terphenyl. These compounds and the compositions containing same are particularly useful in ion-selective electrodes. Such an electrode is capable of selectively transporting sodium ions in preference to other cations. Dry-operative electrodes using these ion-selective compositions as membranes are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.