Sodium ion sensors based on dibenzo-16-crown-5 compounds with amide side arms

Abstract

Abstract Lipophilic dibenzo-16-crown-5 compounds with amide-containing side arms attached to the central carbon atom of the three-carbon bridge in the polyether ring have been applied as neutral carriers for sodium ion-selective field-effect transistors (Na+-ISFET′s). ISFET′s based on these lariat ether amides exhibit excellent Na+/K+ selectivities (KNa′K Pot = 7 × 10−3) and Na+/H+ selectivities (KNa′H Pot = 3 × 10−3) with good selectivities for Na+ over other alkali metal cations and alkaline-earth metal cations. High sensor durability was obtained for these ISFET′s.