Ester type banana-shaped liquid crystalline monomers: Synthesis and physical properties

K. Fodor-Csorba, A. Vajda, Antal Jákli, Christian Slugov, Gregor Trimmel, Dietrich Demus, E. Gács-Baitz, S. Holly, Giancarlo Galli

Research output: Contribution to journalArticle

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Abstract

New ester-type banana (bent-shaped) monomers, 1,3-phenylene bis[4′-(alken-1-yloxy)-biphenyl-4-carboxylate]s Ia-Vb, with different substituent(s) on the central phenyl ring (H, CH3, Cl or NO 2) and alkenyl tails in the side arms (decenyl or undecenyl) were prepared. The analogues IIIa-IVb with 4-chloro- or 4,6-dichloro-substituents exhibited a nematic phase, while Va,Vb with 2-nitro-substituent showed a B 7 phase at relatively low temperature. All the compounds were stable, no degradation or polymerization was observed under applied electric fields or heat treatments. Electro-hydrodynamic instabilities were observed in the nematic phase of each sample. In the B7 phase of Vb there was an electro-optical switching in the range 112-114.5 °C with a switching time of about 150 μs at 20 V μm-1 field. At lower temperatures no electro-optical switching occurred, but a ferroelectric-type spontaneous polarization of 22 nC cm-2 could be detected. The bend angle was calculated by the semiempirical CAChe/MOPAC/PM5 method.

Original languageEnglish
Pages (from-to)2499-2506
Number of pages8
JournalJournal of Materials Chemistry
Volume14
Issue number16
DOIs
Publication statusPublished - Aug 21 2004

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optical switching
esters
Esters
Physical properties
monomers
physical properties
Monomers
Crystalline materials
Liquids
synthesis
liquids
carboxylates
heat treatment
polymerization
hydrodynamics
analogs
degradation
Ferroelectric materials
electric fields
rings

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Materials Science(all)

Cite this

Ester type banana-shaped liquid crystalline monomers : Synthesis and physical properties. / Fodor-Csorba, K.; Vajda, A.; Jákli, Antal; Slugov, Christian; Trimmel, Gregor; Demus, Dietrich; Gács-Baitz, E.; Holly, S.; Galli, Giancarlo.

In: Journal of Materials Chemistry, Vol. 14, No. 16, 21.08.2004, p. 2499-2506.

Research output: Contribution to journalArticle

Fodor-Csorba, K. ; Vajda, A. ; Jákli, Antal ; Slugov, Christian ; Trimmel, Gregor ; Demus, Dietrich ; Gács-Baitz, E. ; Holly, S. ; Galli, Giancarlo. / Ester type banana-shaped liquid crystalline monomers : Synthesis and physical properties. In: Journal of Materials Chemistry. 2004 ; Vol. 14, No. 16. pp. 2499-2506.
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