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Title: Rotaxane-Based Molecular Muscles

Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC); Center for Bio-Inspired Energy Science (CBES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Acc. Chem. Res.; Journal Volume: 47; Related Information: CBES partners with Northwestern University (lead); Harvard University; New York University; Pennsylvania State University; University of Michigan; University of Pittsburgh
Country of Publication:
United States
catalysis (homogeneous), solar (photovoltaic), bio-inspired, charge transport, mesostructured materials, materials and chemistry by design, synthesis (novel materials), synthesis (self-assembly)

Citation Formats

Bruns, Carson J., and Stoddart, Fraser. Rotaxane-Based Molecular Muscles. United States: N. p., 2014. Web. doi:10.1021/ar500138u.
Bruns, Carson J., & Stoddart, Fraser. Rotaxane-Based Molecular Muscles. United States. doi:10.1021/ar500138u.
Bruns, Carson J., and Stoddart, Fraser. Tue . "Rotaxane-Based Molecular Muscles". United States. doi:10.1021/ar500138u.
title = {Rotaxane-Based Molecular Muscles},
author = {Bruns, Carson J. and Stoddart, Fraser},
abstractNote = {},
doi = {10.1021/ar500138u},
journal = {Acc. Chem. Res.},
number = ,
volume = 47,
place = {United States},
year = {Tue Jul 15 00:00:00 EDT 2014},
month = {Tue Jul 15 00:00:00 EDT 2014}
  • We use quantum mechanics to characterize the structure and current-voltage performance of the Stoddart-Heath rotaxane-based programmable electronic switch. We find that the current when the ring is on the DNP is 37?58 times the current when the ring is on the TTF, in agreement with experiment (ratio of 10?100). This establishes the basis for iterative experimental?theoretical efforts to optimize systems for molecule-based electronics which we illustrate by predicting the effect of adding a group such as CN to the rotaxane.
  • Highlights: • Microwave-assisted synthesis of rotaxane based on anthracene and β-cyclodextrin. • Morphological and optical characterization of thin solid film. • Elaboration of impedimetric gold/rotaxane sensor. • Investigation of the membrane sensitivity towards Hg{sup 2+}, Cu{sup 2+} and Pb{sup 2+} cations. - Abstract: An impedimetric sensor based on a new semi-conducting rotaxane has been described for detection of toxic cations. The rotaxane, consists on a π-conjugated material encapsulated into β-cyclodextrin (β-CD); it has been synthesized via the Williamson reaction under microwaves irradiation. The supramolecular structure of the compound was confirmed by NMR and FT-IR spectroscopies. A thin solid film ofmore » the rotaxane was deposited by spin-coating to develop a new electrochemical sensor. The morphological properties of the organic membrane were evaluated using contact angle measurements and atomic force microscopy. The gold/rotaxane/solution interfaces were investigated by electrochemical impedance spectroscopy and the obtained data were fitted using an equivalent electrical circuit. The response of the gold/rotaxane membrane towards Hg{sup 2+}, Cu{sup 2+} and Pb{sup 2+} cations was studied and the results showed a good sensitivity to the mercury cations.« less
  • The molecular sizes of the units concerned in 3-quinuclidinyl benzilate (QNB) binding and in the effects of guanine nucleotide and sulfhydryl reagent on the inhibition of QNB binding by carbachol in smooth muscle of guinea pig ileum were determined to be 76,000, 179,000 and 107,000, respectively by the radiation inactivation method. One or more subunits (GTP subunit) other than the receptor subunit in a muscarinic receptor appeared to be involved in the effect of guanine nucleotide. When guanine nucleotide was present, the receptor subunit seemed to be dissociated from the GTP subunit.