Importance

Loading Importance Indicators...

Abstract

An ion-selective polymeric membrane for an electrochemical sensor for use in analytical chemistry, comprising a) a supporting matrix e.g. of PVC, and b) an ionophore selected from calixarene or oxacalixarene derivatives of the formula IV ##STR1## wherein n+m=3-8; m=0-8; n=0-8; a, which may be the same or different on each aryl group, is 0 or 1; R.sup.2 is alkyl, aryl, alkaryl, alkoxy, alkoxyalkoxy, aryloxy, alkaryloxy, alicyclic, alkylthio, arylthio, alkarylthio, or a substituted derivative thereof; R.sup.3 is --H, alkyl or alkenyl; X is --OH or a group containing an acrylate or methacrylate functional group; provided that when X is --OH, n is at least 1/2(n+m); and provided that when m=0, n=4, a=0 and R.sup.3 is alkyl or allyl, R.sup.2 is not alkoxy having 4 or more carbon atoms in the alkyl group; and provided that when m=0, n=4, a=0 and R.sup.3 is t-butyl, R.sup.2 is not methoxy or ethoxy; or of the formula V ##STR2## wherein R.sup.4 is alkyl; or polymers of those compounds of the formula IV in which X is a group containing an acrylate or methacrylate group. New compounds in which R.sup.2 is --SCH.sub.2 CH.sub.3 are described. Selectivity coefficients and slope measurements are given for the ionophores in PVC electrodes which are selective for sodium, potassium and caesium.

Loading the Abstract Image...

First Claim