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Temperature-resolved study of the structural behaviour of nickel octahexyl phthalocyanine up to the liquid crystal transition

Helliwell, M., Teat, S. J., Coles, S. J. and Reeve, W. (2003) Temperature-resolved study of the structural behaviour of nickel octahexyl phthalocyanine up to the liquid crystal transition Acta Crystallographica Section B - Structural Science, 59, pp. 617-624. (doi:10.1107/S0108768103014708).

Record type: Article

Abstract

This paper describes a temperature-resolved crystallographic investigation into the behaviour of the title compound as the temperature is increased stepwise from room temperature up to 418 K, which is the temperature at which a transition to a discotic columnar mesophase takes place. The experiments were conducted using synchrotron radiation on Station 9.8 at the SRS at the Daresbury Laboratory. An intermediate transition to a less well ordered crystal form was seen at 326 K and differential scanning calorimetry (DSC) measurements confirmed the transition temperature of this change. Also, a new improved room-temperature crystal structure was obtained, as well as further structure determinations at 323, 328 and 353 K. These showed that as the mobility, particularly of the hexyl groups, increases with temperature, the packing of the molecules adjusts from pseudohexagonal layers to a rectangular arrangement.

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More information

Published date: 1 October 2003
Keywords: mesophase

Identifiers

Local EPrints ID: 19976
URI: http://eprints.soton.ac.uk/id/eprint/19976
PURE UUID: 1de85876-0822-495e-8724-1eb56b42b88c
ORCID for S. J. Coles: ORCID iD orcid.org/0000-0001-8414-9272

Catalogue record

Date deposited: 23 Feb 2006
Last modified: 17 Jul 2017 16:29

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Contributors

Author: M. Helliwell
Author: S. J. Teat
Author: S. J. Coles ORCID iD
Author: W. Reeve

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