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Issue 4, 2006
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Semicarbazides as gel forming agents for common solvents and liquid crystals

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Abstract

This paper describes the synthesis of 14 new gelling agents with semicarbazide groups as H-bonding motifs and alkyl- and/or azobenzene side groups. They gel solvents like decaline, 1,2-dichlorobenzene and toluene and liquid crystalline mixtures. X-Ray structure analysis shows that the semicarbazides are connected by H-bonds, each molecule to four neighbours. As a result a ribbon is formed with a core of H-bonded semicarbazide groups and alkyl chains sticking to the side. IR measurements show an unchanged H-bonding motif in large crystals and in the gel fibres, even in LC-mixture. During heating the gel melts (rheology), while the H-bonding motif of the crystal disappears (IR and DSC measurements). First experiments show that these gel-forming agents can be used to gel LC-phases and to stabilise the director pattern present during gel formation.

Graphical abstract: Semicarbazides as gel forming agents for common solvents and liquid crystals

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Publication details

The article was received on 21 Jul 2005, accepted on 19 Oct 2005 and first published on 10 Nov 2005


Article type: Paper
DOI: 10.1039/B510474B
Citation: J. Mater. Chem., 2006,16, 351-358
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    Semicarbazides as gel forming agents for common solvents and liquid crystals

    P. Deindörfer, T. Geiger, D. Schollmeyer, J. H. Ye and R. Zentel, J. Mater. Chem., 2006, 16, 351
    DOI: 10.1039/B510474B

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