NDLI: Effects of alkyl chain length and anion size on thermal and structural properties for 1-alkyl-3-methylimidazolium hexafluorocomplex salts $(C_{x}MImAF_{6},$ x = 14, 16 and 18; A = P, As, Sb, Nb and Ta)

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Hagiwara, Rika Xu, Fei Matsumoto, Kazuhiko
Description	Author Affiliation: Xu F ( Graduate School of Energy Science, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan.)
Abstract	A series of 1-alkyl-3-methylimidazolium hexafluorocomplex salts $(C_{x}MImAF_{6},$ x = 14, 16 and 18, A = P, As, Sb, Nb and Ta) have been characterized by thermal analysis, X-ray diffraction and polarized optical microscopy. A liquid crystalline mesophase is observed for all the $C_{16}MIm$ and $C_{18}MIm$ salts. The $C_{14}MIm^{+}$ cation gives a liquid crystalline mesophase only with $PF_{6}^{−}.$ The temperature range of the liquid crystalline mesophase increases with an increase in alkyl chain length or with decrease in anion size. Single-crystal X-ray diffraction revealed that all the $C_{18}MImAF_{6}$ salts (A = P, As, Sb, Nb and Ta) are isostructural with each other in the crystalline phase and have a layered structure. The interdigitated alkyl chain of the cation has a bent shape like a spoon near the imidazolium ring in the crystalline phase at −100 °C and is tilted with respect to the sheets of the imidazolium headgroups and anions. An increase of temperature increases the ratio of an all-trans conformation to the bent conformation in the crystalline phase. X-ray diffraction and polarized optical microscopy suggested that the liquid crystalline mesophase has a smectic $A_{2}$ structure. The interlayer distance increases with a decrease in the anion size since the smaller anion has a stronger coulombic interaction with the imidazolium headgroup, resulting in the decrease of the interdigitated part to give a larger layer spacing.
ISSN	14779226
Issue Number	12
Journal	Dalton Trans.
Volume Number	41
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2012-03-28
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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