Redox switchable daisy chain rotaxanes driven by radical-radical interactions

Carson J. Bruns, Marco Frasconi, Julien Iehl, Karel J. Hartlieb, Severin T. Schneebeli, Chuyang Cheng, Samuel I Stupp, J. Fraser Stoddart

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

We report the one-pot synthesis and electrochemical switching mechanism of a family of electrochemically bistable 'daisy chain' rotaxane switches based on a derivative of the so-called 'blue box' (BB4+) tetracationic cyclophane cyclobis(paraquat-p-phenylene). These mechanically interlocked molecules are prepared by stoppering kinetically the solution-state assemblies of a self-complementary monomer comprising a BB4+ ring appended with viologen (V2+) and 1,5-dioxynaphthalene (DNP) recognition units using click chemistry. Six daisy chains are isolated from a single reaction: two monomers (which are not formally 'chains'), two dimers, and two trimers, each pair of which contains a cyclic and an acyclic isomer. The products have been characterized in detail by high-field 1H NMR spectroscopy in CD 3CN - made possible in large part by the high symmetry of the novel BB4+ functionality - and the energies associated with certain aspects of their dynamics in solution are quantified. Cyclic voltammetry and spectroelectrochemistry have been used to elucidate the electrochemical switching mechanism of the major cyclic daisy chain products, which relies on spin-pairing interactions between V•+ and BB 2(•+) radical cations under reductive conditions. These daisy chains are of particular interest as electrochemically addressable molecular switches because, in contrast with more conventional bistable catenanes and rotaxanes, the mechanical movement of the ring between recognition units is accompanied by significant changes in molecular dimensions. Whereas the self-complexed cyclic monomer - known as a [c1]daisy chain or molecular 'ouroboros' - conveys sphincter-like constriction and dilation of its ultramacrocyclic cavity, the cyclic dimer ([c2]daisy chain) expresses muscle-like contraction and expansion along its molecular length.

Original languageEnglish
Pages (from-to)4714-4723
Number of pages10
JournalJournal of the American Chemical Society
Volume136
Issue number12
DOIs
Publication statusPublished - Mar 26 2014

Fingerprint

Rotaxanes
Oxidation-Reduction
Catenanes
Viologens
Monomers
Click Chemistry
Dimers
Paraquat
Muscle Contraction
Switches
Constriction
Spectroelectrochemistry
Cations
Dilatation
Magnetic Resonance Spectroscopy
Isomers
Nuclear magnetic resonance spectroscopy
Cyclic voltammetry
Muscle
Positive ions

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Bruns, C. J., Frasconi, M., Iehl, J., Hartlieb, K. J., Schneebeli, S. T., Cheng, C., ... Stoddart, J. F. (2014). Redox switchable daisy chain rotaxanes driven by radical-radical interactions. Journal of the American Chemical Society, 136(12), 4714-4723. https://doi.org/10.1021/ja500675y

Redox switchable daisy chain rotaxanes driven by radical-radical interactions. / Bruns, Carson J.; Frasconi, Marco; Iehl, Julien; Hartlieb, Karel J.; Schneebeli, Severin T.; Cheng, Chuyang; Stupp, Samuel I; Stoddart, J. Fraser.

In: Journal of the American Chemical Society, Vol. 136, No. 12, 26.03.2014, p. 4714-4723.

Research output: Contribution to journalArticle

Bruns, CJ, Frasconi, M, Iehl, J, Hartlieb, KJ, Schneebeli, ST, Cheng, C, Stupp, SI & Stoddart, JF 2014, 'Redox switchable daisy chain rotaxanes driven by radical-radical interactions', Journal of the American Chemical Society, vol. 136, no. 12, pp. 4714-4723. https://doi.org/10.1021/ja500675y
Bruns CJ, Frasconi M, Iehl J, Hartlieb KJ, Schneebeli ST, Cheng C et al. Redox switchable daisy chain rotaxanes driven by radical-radical interactions. Journal of the American Chemical Society. 2014 Mar 26;136(12):4714-4723. https://doi.org/10.1021/ja500675y
Bruns, Carson J. ; Frasconi, Marco ; Iehl, Julien ; Hartlieb, Karel J. ; Schneebeli, Severin T. ; Cheng, Chuyang ; Stupp, Samuel I ; Stoddart, J. Fraser. / Redox switchable daisy chain rotaxanes driven by radical-radical interactions. In: Journal of the American Chemical Society. 2014 ; Vol. 136, No. 12. pp. 4714-4723.
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