SACCHARIDE CONTROL OF ENERGY-TRANSFER LUMINESCENCE OF LANTHANIDE IONSENCAPSULATED IN CALIX[4]ARENES - A NOVEL DISCRIMINATION METHOD FOR THE ENERGY-TRANSFER ROUTE

A calix[4]arene bearing three amide groups (composing a lanthanide bin ding site) and one sensitizer (phenacyl group) bearing an (o-boronylph enyl)methylaminomethyl group (acting as a sugar-binding site) was synt hesized. The energy-transfer to Eu3+ was significantly enhanced wherea s that to Tb3+ was only slightly enhanced, indicating that in the Eu3 complex the energy is mainly transferred from the sensitizer whereas in the Tb3+ complex it is mainly transferred from the calix[4]arene ar omatic rings. This is a novel method for discriminating the energy-tra nsfer path.