APPLICATION OF A NEW PHOSPHADITHIAMACROCYCLE TO CLO4--SELECTIVE CHEMFET AND ION-SELECTIVE ELECTRODE DEVICES

A new dithiamacrocycle incorporating a phosphine donor group (I) has b een synthesized and tested as neutral carrier in PVC membranes. ClO4-- selective CHEMFET and ISE devices based on these plasticized membranes have been developed. Both devices have shown Nernstian response and a wide working pH range. Most common anions, except BF4-, do not cause interferences. The response properties and selectivity found for perch lorate ions compare favourably with the commercial and conventional Cl O4- electrodes based on quaternary ammonium ion-exchange sites. This i s probably the first example of perchlorate selective CHEMFETs.