title: Toward electrochemically controllable tristable three-station [2]catenanes.
abstract: Encouraged by the prospect of producing an electrochemical, color-switchable red-green-blue (RGB) dye compound, we have designed, synthesized, and characterized two three-station [2]catenanes. Both are composed of macrocyclic polyethers containing three pi-electron-rich stations, which act as recognition sites for a pi-electron-deficient tetracationic cyclophane. The molecular structures of the two three-station [2]catenanes were characterized fully by mass spectrometry and 1H NMR spectroscopy. To anticipate the relative occupancies of the three stations in each [2]catenane by the cyclophane, model compounds with the same constitutions in the vicinity of the stations were synthesized. The relative ground-state populations of the three stations occupied in both [2]catenanes were estimated from the thermodynamic parameters for 1:1 complexes between all these model compounds and the cyclophane, obtained from isothermal titration calorimetry (ITC). The electrochemical and electromechanical properties of the three-station [2]catenanes were analyzed by cyclic voltammetry (CV), differential pulse voltammetry (DPV), and spectroelectrochemistry (SEC). The first three-station [2]catenane was found to behave like a bistable system, whereas the second can be described as a quasi-tristable system.
authors: The California NanoSystems Institute, USA.
authors: Taichi
authors: T
authors: Ikeda
authors: Sourav
authors: S
authors: Saha
authors: Ivan
authors: I
authors: Aprahamian
authors: Ken C-F
authors: KC
authors: Leung
authors: Adides
authors: A
authors: Williams
authors: Wei-Qiao
authors: WQ
authors: Deng
authors: Amar H
authors: AH
authors: Flood
authors: William A
authors: WA
authors: Goddard
authors: J Fraser
authors: JF
authors: Stoddart