Liquid crystalline properties of unsymmetrically substituted phthalocyanines: structural features leading to nematic mesophase materials

Garland, Andrew, Bryant, Geoffrey, Cambrier, Isabelle, Cammidge, Andy ORCID: https://orcid.org/0000-0001-7912-4310 and Cook, Mike (2014) Liquid crystalline properties of unsymmetrically substituted phthalocyanines: structural features leading to nematic mesophase materials. Journal of Porphyrins and Phthalocyanines, 18. pp. 944-949. ISSN 1088-4246

[thumbnail of jpp Kobayashi 2014 Andy MIKE 27 08 14 Revised following checklist]
Preview
PDF (jpp Kobayashi 2014 Andy MIKE 27 08 14 Revised following checklist) - Accepted Version
Download (700kB) | Preview

Abstract

A novel homologous series of four 1,4,8,11,15,18-hexakis(pentyl)-22-methyl-25-hydroxyalkylphthalocyanine derivatives with the hydroxyalkyl chain varying from hydroxynonyl through to hydroxydodecyl has been synthesized to investigate the role of the hydroxyalkyl chain in promoting thermotropic liquid crystalline behavior. Polarizing optical miscoscopy reveals that the compound with the shortest hydroxyalkyl chain (hydroxynonyl) exhibits a mesophase with a texture characteristic of a columnar mesophase, common among liquid crystalline phthalocyanine derivatives. However, as the chain is lengthened along the series, there appears a second type of mesophase that shows a schlieren texture. Such a texture is characteristic of a nematic phase and rare among liquid crystalline phthalocyanine derivatives. A fifth compound, the novel 1,4,8,11,15,18-hexakis(pentyl)-22-methyl-25- dodecylphthalocyanine, exhibits only columnar mesophase behavior suggesting that the hydroxyl group at the end of the longer chains of the former compounds is important in developing the nematic phase.

Item Type: Article
Uncontrolled Keywords: liquid crystalline phthalocyanines,columnar mesophase,nematic discotic mesophase
Faculty \ School: Faculty of Science > School of Chemistry
UEA Research Groups: Faculty of Science > Research Groups > Synthetic Chemistry (former - to 2017)
Faculty of Science > Research Groups > Chemistry of Materials and Catalysis
Faculty of Science > Research Groups > Chemistry of Light and Energy
Depositing User: Pure Connector
Date Deposited: 09 Mar 2015 07:32
Last Modified: 12 May 2023 09:31
URI: https://ueaeprints.uea.ac.uk/id/eprint/52535
DOI: 10.1142/S1088424614500722

Actions (login required)

View Item View Item