Issue 7, 2003

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

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

Supplementary files

Additions and corrections

Article information

Article type
Paper
Submitted
08 Apr 2003
Accepted
01 May 2003
First published
14 May 2003

J. Mater. Chem., 2003,13, 1639-1645

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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