Electrochemical and ~(19)F NMR Detection of Anions,Ion-pairs,and a Zwitterionic Amino Acid with a Ferrocene-based Hetero-ditopic Receptor Bearing o-(Carboxamido)trifluoroacetophenone and Crown-ether Ligands

摘要

Described are the electrochemical and ~(19)F NMR detection of anions,ion-pairs,and zwitterionic L-phenyl-alanine with the ferrocene-based hetero-ditopic receptor.A cyclic voltammetric study shows that the receptor induces a positive shift in the ferrocene oxidation potential upon binding of a potassium cation,whereas it induces a negative shift upon binding of an acetate anion,both of which can be reversed.Also,the redox potential shifts were dependent on ion-pairing interactions.Furthermore,direct detection of an amino acid in its zwitterionic form is demonstrated by ~(19)F NMR spectroscopy in aqueous media.