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Molecular Machines and Motors: Recent Advances and Perspectives

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    0438190 - ÚOCHB 2015 RIV DE eng M - Monography Chapter
    Zhao, K. - Dron, P. I. - Kaleta, Jiří - Rogers, C. T. - Michl, Josef
    Arrays of Dipolar Molecular Rotors in Tris(o-phenylenedioxy)cyclotriphosphazene.
    Molecular Machines and Motors: Recent Advances and Perspectives. Vol. 354. Cham: Springer, 2014 - (Credi, A.; Silvi, S.; Venturi, M.), s. 163-211. Topics in Current Chemistry. ISBN 978-3-319-08677-4
    EU Projects: European Commission(XE) 227756 - DIPOLAR ROTOR ARRAY
    Institutional support: RVO:61388963
    Keywords : dielectric spectroscopy * hexagonal TPP * inclusion compounds * molecular rotors * powder X-ray diffraction * solid-state NMR
    Subject RIV: CF - Physical ; Theoretical Chemistry

    Regular two-dimensional or three-dimensional arrays of mutually interacting dipolar molecular rotors represent a worthy synthetic objective. Their dielectric properties, including possible collective behavior, will be a sensitive function of the location of the rotors, the orientation of their axes, and the size of their dipoles. Host-guest chemistry is one possible approach to gaining fine control over these factors. We describe the progress that has been achieved in recent years using tris(o-phenylenedioxy)cyclotriphosphazene as a host and a series of rod-shaped dipolar molecular rotors as guests. Structures of both surface and bulk inclusion compounds have been established primarily by solid-state nuclear magnetic resonance (NMR) and powder X-ray diffraction (XRD) techniques. Low-temperature dielectric spectroscopy revealed rotational barriers as low as 1.5 kcal/mol, but no definitive evidence for collective behavior has been obtained so far.
    Permanent Link: http://hdl.handle.net/11104/0241653

     
     
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