Synthetic calix[4]arene-crown ionophores for selective Na+ (ionophore L1) and Cs+-ions (ionophore L2) recognition find application in ion-selective membrane electrodes (ISE) for analytical purpose. Selectivity coefficients for the electrodes with compounds L1 and L2 are log K-Na.Cs(pot) = -2.6 and log K-Cs.Na(pot) = -2.4, respectively. Electrodes of two different construction: all-solid-state (ASS) (with conducting polymer . layer on glassy carbon or platinum as ion-to-electron transducer) and conventional ion-selective electrode (ISE) (with liquid electrolyte and Ag/AgCl) are presented and their properties and lifetime are being compared. Resistance of PVC membrane with ionophores L1 and L2 were within the range 0.15-1.4 M Omega depending on the type of the outer electrolyte and its concentration. Conductivity of the membranes was in the range 0.7 x 10(-8) to 6 x 10(-8) Omega(-1) cm(-1). Warburg coefficients sigma were within 0.16 x 10(4) to 12.7 x 10(4) Omega s(-1/2), dielectric constant values E were in a range 28-60 depending mainly on the type of plasticizer. (c) 2005 Elsevier Ltd. All rights reserved.