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Issue 28, 2015
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High binding yet accelerated guest rotation within a cucurbit[7]uril complex. Toward paramagnetic gyroscopes and rolling nanomachines

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Abstract

The (15-oxo-3,7,11-triazadispiro[5.1.5.3]hexadec-7-yl)oxidanyl, a bis-spiropiperidinium nitroxide derived from TEMPONE, can be included in cucurbit[7]uril to form a strong (Ka ∼ 2 × 105 M−1) CB[7]@bPTO complex. EPR and MS spectra, DFT calculations, and unparalleled increased resistance (a factor of ∼103) toward ascorbic acid reduction show evidence of deep inclusion of bPTO inside CB[7]. The unusual shape of the CB[7]@bPTO EPR spectrum can be explained by an anisotropic Brownian rotational diffusion, the global tumbling of the complex being slower than rotation of bPTO around its “long molecular axis” inside CB[7]. The CB[7] (stator) with the encapsulated bPTO (rotator) behaves as a supramolecular paramagnetic rotor with increased rotational speed of the rotator that has great potential for advanced nanoscale machines requiring wheels such as cucurbiturils with virtually no friction between the wheel and the axle for optimum wheel rotation (i.e. nanopulleys and nanocars).

Graphical abstract: High binding yet accelerated guest rotation within a cucurbit[7]uril complex. Toward paramagnetic gyroscopes and rolling nanomachines

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Publication details

The article was received on 19 May 2015, accepted on 04 Jun 2015 and first published on 12 Jun 2015


Article type: Paper
DOI: 10.1039/C5NR03288A
Citation: Nanoscale, 2015,7, 12143-12150
  • Open access: Creative Commons BY license
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    High binding yet accelerated guest rotation within a cucurbit[7]uril complex. Toward paramagnetic gyroscopes and rolling nanomachines

    G. Casano, F. Poulhès, T. K. Tran, M. M. Ayhan, H. Karoui, D. Siri, A. Gaudel-Siri, A. Rockenbauer, G. Jeschke, D. Bardelang, P. Tordo and O. Ouari, Nanoscale, 2015, 7, 12143
    DOI: 10.1039/C5NR03288A

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