Lower Rim Substituted p-tert-Butyl Calix [4]arenes(V.)Synthesis of New 5,11,17,22-tetrakis-p-tert-Butyl-25-27-bis(methoxy)-26,28-bis(dialkoxyphosphorylmethoxy)calix[4]arenes and Cation complexation studies in Ion-SelectiveMembrane Electrodes

摘要

The synthesisand characterization of the lower rim bis-phosphorylated tetrakis-p-tert-butyl-25,27-bis(mehtoxy)calix[4]-arenes(compounds2-4) is presented.The sutdied compounds were examined as ionophores in ion-selective membrane electrodes,showing selectivity for rubidium,potassium and for the large and flat guanidinium cations(G~+).The correlation was studiedbeetween the stereochemical structure of the ligands and potentiometrically detrmined ion-selectivity.Complex formation constants in the stereochemical structure of the ligands and potiometrically determined ion-selectivity.Complex formation constants in the PVC/BEHS(bis(ethyl)hexyl sebacate) membranes weredetermined.The crystal and molecular structures of compound 4 have been detrmined by single crystal X-ray diffraction study.