New optically active bis(12-crown-4) based electrodes for Na+ were evaluated. The best selectivity (log k = −2.3) was obtained when the sensors were used in association with NPOE as a plasticizing solvent mediator and NaHFPB as an anion excluder in PVC matrices. Na+ selectivity against K+ was augmented by a factor of nearly two using R,R- or S,S- bis(12-crown-4) compared with that of optically inactive bis(12-crown-4)s reported previously.
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