Author： Belushkin A.V. Cook M. J. Frezzato D. Haslam S. D. Rini A. Ferra Martin D. Mcmurdo J. Nordio P. L. Richardson R. M. Stafford A.
Publisher： Taylor & Francis Ltd
ISSN： 1362-3028
Source： Molecular Physics, Vol.93, Iss.4, 1998-03, pp. : 593-607
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Abstract
The incoherent quasi-elastic neutron scattering from the heptyl and octyl derivatives of the acta-alkylphthalocyanines, CnPcH , in their crystalline and liquid crystalline (discotic columnar) phases has been measured. Diffusive motion is observed on the 10 10 to 10 12 s timescale. This is interpreted as alkyl chain motion. A detailed comparison of the mesophase data for C7PcH has been made with the predictions of the rotational isomeric state model, and an 2 extra motion on this timescale has been invoked, which probably is a localized translational motion. A small discontinuity in the elastic fraction of the quasi-elastic scattering is consistent with a change in the molecular tilt at the transition between the two D phases. 2- hd
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