In order to obtain insights into relationships between the calixarene structure and the ion selectivity in the electrode system, 20 ionophoric calixarenes were synthesized and their ion selectivity (with Na+ as a standard) estimated. Among these ionophoric calixarenes, 25,26,27,28-tetrakis[(ethoxycarbonyl)methoxy]-p-t-octylcalixarene afforded the highest log KNA,Mpot value (-3.1) in the presence of 2-fluorophenyl-2′-nitrophenylether (10) as the best of 13 plasticizers. This is the first example in which the Na+/K+ selectivity exceeds a factor of 103 in the electrode system based on the neutral carrier. The high Na+ selectivity is attributed to modification of the upper rim which ostensibly has no relation with the component of the cavity. This paper demonstrates the potential relationships between the unique structure of the calixarene-based ligands and selectivity performance for the design of ion-selective electrodes.
|Number of pages||18|
|Journal||Journal of Inclusion Phenomena and Molecular Recognition in Chemistry|
|Publication status||Published - Sep 1 1992|
All Science Journal Classification (ASJC) codes
- Food Science
- Condensed Matter Physics