Mesomorphic 1,2,4-triazine-4-oxides in the synthesis of new heterocyclic liquid crystals

Valery N. Kozhevnikov; Stephen J. Cowling; Peter B. Karadakov; Duncan W. Bruce

doi:10.1039/b718432h

Mesomorphic 1,2,4-triazine-4-oxides in the synthesis of new heterocyclic liquid crystals

Valery N. Kozhevnikov, Stephen J. Cowling, Peter B. Karadakov, Duncan W. Bruce

Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

New liquid-crystalline materials are described, which are obtained using a versatile synthetic methodology that employs the intermediacy of 1,2,4-triazines. Triazines, triazine-N-oxides, pyridine and laterally cyanated pyridines are among the compounds reported and the mesomorphism of the different structures shows how function affects mesomorphism. In particular, systems based on laterally cyanated pyridines turn out to be materials with low melting points and wide phase ranges. Lateral dipole moments, calculated at the Hartree-Fock level for the triazine-N-oxides and the cyanopyridines, showed a significant dependence on conformation and confirmed that the dipole moment was great for the latter materials. Appreciable spontaneous polarisation was measured for chiral derivatives of the triazine-N-oxides.

Original language	English
Pages (from-to)	1703-1710
Number of pages	8
Journal	Journal of Materials Chemistry
Volume	18
Issue number	14
DOIs	https://doi.org/10.1039/b718432h
Publication status	Published - 2008

Keywords

PYRIDINE-DERIVATIVES

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10.1039/b718432h

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abstract = "New liquid-crystalline materials are described, which are obtained using a versatile synthetic methodology that employs the intermediacy of 1,2,4-triazines. Triazines, triazine-N-oxides, pyridine and laterally cyanated pyridines are among the compounds reported and the mesomorphism of the different structures shows how function affects mesomorphism. In particular, systems based on laterally cyanated pyridines turn out to be materials with low melting points and wide phase ranges. Lateral dipole moments, calculated at the Hartree-Fock level for the triazine-N-oxides and the cyanopyridines, showed a significant dependence on conformation and confirmed that the dipole moment was great for the latter materials. Appreciable spontaneous polarisation was measured for chiral derivatives of the triazine-N-oxides.",

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AU - Kozhevnikov, Valery N.

AU - Cowling, Stephen J.

AU - Karadakov, Peter B.

AU - Bruce, Duncan W.

PY - 2008

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AB - New liquid-crystalline materials are described, which are obtained using a versatile synthetic methodology that employs the intermediacy of 1,2,4-triazines. Triazines, triazine-N-oxides, pyridine and laterally cyanated pyridines are among the compounds reported and the mesomorphism of the different structures shows how function affects mesomorphism. In particular, systems based on laterally cyanated pyridines turn out to be materials with low melting points and wide phase ranges. Lateral dipole moments, calculated at the Hartree-Fock level for the triazine-N-oxides and the cyanopyridines, showed a significant dependence on conformation and confirmed that the dipole moment was great for the latter materials. Appreciable spontaneous polarisation was measured for chiral derivatives of the triazine-N-oxides.

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M3 - Article

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Mesomorphic 1,2,4-triazine-4-oxides in the synthesis of new heterocyclic liquid crystals

Abstract

Keywords

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