K. Kimura et al., CALIX[4]ARENE DERIVATIVE BEARING PI-COORDINATE SUBSTITUENTS AS NEUTRAL CARRIER FOR SILVER ION SENSORS, Chemistry Letters, (8), 1998, pp. 833-834
Calix[4]arene tetra(allyl ether) 1 was applied as a neutral carrier of
silver ion sensors, which exhibited an excellent silver ion selectivi
ty against sodium ion, while calix[4]arene tetra(allyl ester) 2 posses
ses only poor silver ion selectivity with severe sodium ion interferen
ce.