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Title: Liquid-crystalline azines formed by the rare-earth promoted decomposition of hydrazide "habbe'' ligands: structural and thermal properties
Authors: Van Deun, Rik ×
Parac-Vogt, Tatjana
Van Hecke, Kristof
Van Meervelt, Luc
Binnemans, Koen
Guillon, Daniel
Donnio, Bertrand #
Issue Date: 2003
Publisher: Royal soc chemistry
Series Title: Journal of materials chemistry vol:13 issue:7 pages:1639-1645
Abstract: In an attempt to synthesise liquid-crystalline rare-earth complexes of some habbe-type ligands (habbe = N-(2-{( 2E)-2-[2-hydroxy-4-(alkoxy) benzylidene] hydrazino}-2-oxoethyl) benzamide), decomposition of these ligands was observed. A synthetic pathway is proposed, in which the rare-earth ion promotes the decomposition of the habbe ligand into a symmetrical azine, which shows mesomorphism. The thermal behaviour of four azines obtained in this way was studied by hot-stage polarizing optical microscopy, differential scanning calorimetry (DSC) and high-temperature powder diffraction methods and shows that all four compounds are liquid-crystalline. The crystal structure of one of the azines has been determined by single crystal X-ray diffraction and shows an elongated orientation of the molecules and a layered crystal packing. Both starting and end products were further characterized by 1H-NMR.
ISSN: 0959-9428
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Design and Synthesis
Molecular Imaging and Photonics
Biochemistry, Molecular and Structural Biology Section
× corresponding author
# (joint) last author

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