Cyclic voltammetry selective binding

Similar structures 37 and 38, bearing ureido functions on the lower rim of calix[4]diquinone or monoquinone moieties, were used for anion recognition with the aid of electrochemistry (cyclic voltammetry) [47,48]. Some of these compounds were found [49] to bind selectively HSOj or H2POj anions. 

Binding constants in solution are usually determined from potentiometric titrations or plots of cyclic voltammetry peak potentials vs. CyD concentration after assessing the guest/host ratio in the complex [3, 4]. Potentiometric measurements are more frequently used, and ion-selective electrodes are employed, for the direct measurement of the guest activity in the solution. Measurements of pH allow the evaluation of concentrations of several reaction components. 

CD2CI2, acetone-Je and CD3CN [121], which revealed that the incorporation of one or more electron-rich TTF subunits improved the binding ability and changed the binding selectivity. The complexation for halides was also monitored by cyclic voltammetry in 1,2-dichloroethane, which revealed electrochemical response to CF and Br ions. 

---