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Issue 7, 2003
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Liquid-crystalline azines formed by the rare-earth promoted decomposition of hydrazidehabbeligands: structural and thermal properties

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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.

Graphical abstract: Liquid-crystalline azines formed by the rare-earth promoted decomposition of hydrazide “habbe” ligands: structural and thermal properties

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The article was received on 08 Apr 2003, accepted on 01 May 2003 and first published on 14 May 2003


Article type: Paper
DOI: 10.1039/B303941M
J. Mater. Chem., 2003,13, 1639-1645

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    Liquid-crystalline azines formed by the rare-earth promoted decomposition of hydrazidehabbeligands: structural and thermal properties

    R. Van Deun, T. N. Parac-Vogt, K. Van Hecke, L. Van Meervelt, K. Binnemans, D. Guillon and B. Donnio, J. Mater. Chem., 2003, 13, 1639
    DOI: 10.1039/B303941M

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