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000151796 1001_ $$0P:(DE-HGF)0$$aKrause, Christina$$b0$$eCorresponding author
000151796 245__ $$aVibrational Density of States of Triphenylene Based Discotic Liquid Crystals: Dependence on the Length of the Alkyl Chain
000151796 260__ $$aCambridge$$bRSC Publ.$$c2014
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000151796 520__ $$aThe vibrational density of states of a series of homologous triphenylene-based discotic liquid crystals HATn (n = 5, 6, 8, 10, 12) depending on the length of the aliphatic side chain is investigated by means of inelastic neutron scattering. All studied materials have a plastic crystalline phase at low temperatures, followed by a hexagonally ordered liquid crystalline phase at higher temperatures and a quasi isotropic phase at the highest temperatures. The X-ray scattering pattern for the plastic crystalline phase of all materials shows a sharp Bragg reflection corresponding to the intercolumnar distance in the lower q-range and a peak at circa 17 nm−1 related to intracolumnar distances between the cores perpendicular to the columns as well as a broad amorphous halo related to the disordered structure of the methylene groups in the side chains in the higher q-range. The intercolumnar distance increases linearly with increasing chain length for the hexagonal columnar ordered liquid crystalline phase. A similar behaviour is assumed for the plastic crystalline phase. Besides n = 8 all materials under study exhibit a Boson peak. With increasing chain length, the frequency of the Boson peak decreases and its intensity increases. This can be explained by a self-organized confinement model. The peaks for n = 10, 12 are much narrower than for n = 5, 6 which might imply the transformation from a rigid system to a softer one with increasing chain length. Moreover the results can also be discussed in the framework of a transition from an uncorrelated to a correlated disorder with increasing n where n = 8 might be speculatively considered as a transitional state.
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000151796 7001_ $$0P:(DE-Juel1)131067$$aZorn, Reiner$$b1
000151796 7001_ $$0P:(DE-HGF)0$$aEmmerling, Franziska$$b2
000151796 7001_ $$0P:(DE-HGF)0$$aFrick, Bernhard$$b3
000151796 7001_ $$0P:(DE-HGF)0$$aHuber, Patrick$$b4
000151796 7001_ $$0P:(DE-HGF)0$$aFalkenhagen, Jana$$b5
000151796 7001_ $$0P:(DE-HGF)0$$aSchoenhals, A.$$b6
000151796 773__ $$0PERI:(DE-600)1476244-4$$a10.1039/c3cp55303e$$gp. 10.1039.c3cp55303e$$p7324 - 7333$$tPhysical chemistry, chemical physics$$v16$$x1463-9084$$y2014
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