Freezing of conformational disorder in cyanocyclohexane
In a plastic phase molecules form a long range ordered crystal in which overall molecular tumbling appears, yielding an orientationally disordered crystal. This kind of disorder can be frozen and an orientational glass (OG) can be formed by cooling at moderate rates. The OG formed by cyanocylohexane is found to be of intermediate fragility by dynamics measurements. We have already obtained the dielectric spectra (DS) of this compound as well as the thermal conductivity (down to 2 K), and it reveals a complex behaviour which does not allow yet the fully understanding of the dynamics. The problem appears by the existence of several conformers associated with the CN group (axial and equatorial) and with the ring (chair). The abundance of the different conformers seems to change with temperature in such a way that additional conformational glass transitions (appearing in the specific heat measurements) emerge. We propose to measure the vibrational density of states up to an energy of 350 meV that will cover the intramolecular vibrations of the ring and the two different conformations on the inelastic spectrometer IN1BeF ou Lagrange.
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TAMARIT Josep Lluís; DEL BARRIO Maria; JIMENEZ RUIZ Monica; L. C. Pardo; ROMANINI Michela and RUIZ MARTIN Maria Dolores. (2013). Freezing of conformational disorder in cyanocyclohexane. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-05-897
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