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Issue 7, 2011
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Ionic liquid crystals derived from 4-hydroxypyridine

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Abstract

Monoalkylation of 4-hydroxypyridine gave either neutral N-alkyl-4-pyridones or 4-alkoxypyridines depending on the site (N or O) of alkylation. Further alkylation of these two neutral compounds yielded ionic liquid crystals (ILCs) of N-alkyl-4-alkoxypyridinium bromide, having two long alkyl chains. Alternatively, simple protonation of the two neutral compounds with HCl also induced the formation of ILCs of N-alkyl-4-hydroxypyridinium chloride or 4-alkoxypyridinium hydrochloride. Crystal structures of two different types of ionic liquid crystals and one neutral compound were determined via single crystal X-ray diffraction. Mesophase properties were examined by the technique of differential scanning calorimetry, polarized optical microscopy, and powder X-ray diffractometry. Anions influence the structure and stability of the mesophase in the dialkylated compounds. The self-assembly behavior of some typical compounds in solution was studied using the technique of NMR diffusion order spectroscopy. Finally, stable Au nanoparticles stabilized by a pyridinium salt were prepared and characterized.

Graphical abstract: Ionic liquid crystals derived from 4-hydroxypyridine

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Publication details

The article was received on 25 Nov 2010, accepted on 05 Jan 2011 and first published on 21 Feb 2011


Article type: Paper
DOI: 10.1039/C0SM01376E
Citation: Soft Matter, 2011,7, 3491-3501
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    Ionic liquid crystals derived from 4-hydroxypyridine

    J. Lu, C. Lee and I. J. B. Lin, Soft Matter, 2011, 7, 3491
    DOI: 10.1039/C0SM01376E

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