Abstract
Abstract A new class of neutral ligands is synthesized and studied for the binding properties with anions by electrochemical methods. The binding of calix[4]diquinone 1 with HSO 4 − causes a large negative shift of the electrode potentials of the calix[4]diquinone. This novel neutral anion receptor 1 binds anions through hydrogen-bonding and shows high selectivity for HSO 4 − over H 2 PO 4 − , Cl − , and CH 3 CO 2 − . The selectivity of HSO 4 − over H 2 PO 4 − , Cl − , and CH 3 CO 2 − may be attributed to the stronger hydrogen-bonding with the urea moiety, and also with the quinone moiety of 1 receptor, and also the greater compatibility of the cavity of 1 with tetrahedral HSO 4 − .
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