Poly(vinyl chloride) membrane CHEMFETs incorporating a novel calixarene derivative (1), novel calixarene derivatives (3, 4, 5, 6 and 7), phosphate derivatives of p-tert-butylcalixarene (2) or p-tert-butylcalixarene (8) with variable amounts of hydrophobic anions [potassium tetrakis(4-chlorophenyl)borate (KTCTPB)] have been tested for their response to guanidinium ions in the presence of the interfering ions Na+, K+, NH4+ and Ca2+.The best guanidinium selectivity has been obtained for the CHEMFET based on the 1,3,5-triamide derivative of p-tert-butylcalixarene (4), with dibutyl phthalate as solvent mediator, and 50 mol% KTCTPB with respect to the ionophore. The selectivity coefficients (log KpotGu,j) are the highest reported for guanidinium ions in a potentiometric sensor. The CHEMFETs show an almost ideal Nernstian response in the linear range (slope 58–60 mV decade–1).
|Journal||Journal of the Chemical Society. Perkin transactions II|
|Publication status||Published - 1994|