Ion-Selective Electrodes Based on p-tert-Butyl-homooxacalixarene di(ethyl)amides
Résumé
Abstract The diethyl amides of p-tert-butyldihomooxacalix[4]arene (1), p-tert-butylhexahomotrioxa-calix[3]arene (2) and p-tert-butylcalix[4]arene (3) were used as active materials in ion-selective membrane electrodes (ISE) to check the detection of different kinds of cations (Na+, K+, Cs+, Mg2+, Ca2+, Mn2+, Cu2+, Zn2+, Cd2+, Pb2+ and TMA+). The electrode characteristics and selectivity coefficients were determined and compared. Optimisation of the PVC membrane composition was achieved using three different plasticizers (DEHA, o-NPOE or BBPA). Amide 3 shows selectivity for Na+, whereas compounds 1 and 2 exhibit the highest selectivity for Pb2+ among all the studied cations. The X-ray crystal structure of dihomooxacalix[4]arene tetra(diethyl)amide 1 was determined revealing it to be in the cone conformation.
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