Journal
SOFT MATTER
Volume 7, Issue 7, Pages 3491-3501Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0sm01376e
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Funding
- National Science Council of Taiwan [NSC 97-2113-M-259-009-MY3]
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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.
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