Toward electrochemically controllable tristable three-station [2]catenanes

Taichi Ikeda, Sourav Saha, Ivan Aprahamian, Ken C F Leung, Adides Williams, Wei Qiao Deng, Amar H. Flood, William A. Goddard, J. Fraser Stoddart*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

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 π-electron-rich stations, which act as recognition sites for a π-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.

Original languageEnglish (US)
Pages (from-to)76-93
Number of pages18
JournalChemistry - An Asian Journal
Volume2
Issue number1
DOIs
StatePublished - 2007

Keywords

  • Catenanes
  • Crown ethers
  • Electrochemistry
  • Molecular devices
  • Thermodynamics

ASJC Scopus subject areas

  • Biochemistry
  • Organic Chemistry

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