NOVEL 9,10-BIS(1,3-DITHIOL-2-YLIDENE)-9,10-DIHYDROANTHRA-CENE DERIVATIVES BRIDGED BY A CROWN ETHER UNIT AT THE 1,8-POSITIONS;A NEW TYPE OF REDOX-SWITCHABLE HOSTS UNDERGOING REVERSIBLE STRUCTURAL CHANGES

摘要

Novel redox-switchable host molecules(2)composed of a 9,10-bis(1,3-dithiol-2-ylidene)-9,10-dihydroanthracene unit and a crown ether moiety bridging the 1,8-positions have been synthesized.Cyclic voltammetry and X-Ray analyses revealed that the molecules undergo a significant structural change upon oxidation.~1H-NMR titration experiments on the neutral and dication states show that the binding abilities of the dication states for alkali metal cations(Li~+,Na~+,K~+)are considerably lower than those of the neutral molecules.The binding properties of 2 were also investigated by cyclic voltammetry.