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Synthesis of 2-pyridylthiazole ethers 2, 3), 4-nonyl-2-pyridylthiazole 4), 2-nonyl-4-pyridylthiazole 5) and 2-pyridylthiazole imine 6), potentially useful as effective cation-binding ligands, is described. The potentiometric properties of ion-selective membranes prepared with 30–32 wt% PVC, 66 wt% 2-nitrophenyloctyl ether and 2–4 wt% pyridylthiazole derivatives have been examined. While the membranes containing 2-pyridylthiazole ethers 1-4) exhibited high selectivity toward silver(I) ion, that prepared with 2-pyridylthiazole imine 6) resulted in negligible potentiometric reponse to most mono- and divalent cations.