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Long-alkyl-chain-derivatized imidazolium salts and ionic liquid crystals with tailor-made properties

机译:具有量身定制的性能的长烷基链衍生的咪唑鎓盐和离子液晶

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A series of new 1,3-dialkylimidazolium salts with the general formula [C _( n ) C _( n ) IM][A] (for n = 12; A = PF _(6) ~(?) , OTf ~(?) , NTf _(2) ~(?) ; for n = 10, 14, 16, and 18; A = BF _(4) ~(?) , ClO _(4) ~(?) ) has been synthesized. The [C _(12) C _(12) IM][A] salts are ionic liquids at room temperature, whereas all [C _( n ) C _( n ) IM][BF _(4) ] and [C _( n ) C _( n ) IM][ClO _(4) ] ( n = 10, 14, 16, 18) salts demonstrate a liquid crystalline phase at elevated temperatures that have a large mesophase window, which varies from 10 to 80 °C with increasing alkyl chain length. In particular, [C _(10) C _(10) IM][BF _(4) ] shows liquid crystalline behavior at room temperature and therefore is potentially suitable for application as a pre-organized reaction medium in synthesis and catalysis. Viscosity studies of [C _(16) C _(16) IM][BF _(4) ] and the corresponding perchlorate salt demonstrate strong non-Newtonian viscosity behavior for the liquid crystalline state of these ionic liquids.
机译:一系列新的1,3-二烷基咪唑鎓盐,通式[c _(n)c _(n)Im] [a](对于n = 12; a = pf _(6)〜(?),otf〜 (?),ntf _(2)〜(?);对于n = 10,14,16和18; a = bf _(4)〜(?),clo _(4)〜(?))已经存在合成。 [C _(12)C _(12)IM] [A]盐是室温下的离子液体,而全部[C _(n)C _(n)IM] [BF _(4)]和[C _(n)c _(n)IM] [CLO _(4)](n = 10,14,16,18)盐在具有大的中间相窗口的升高温度下证明液晶相,从10到10 80℃随着烷基链长度的增加。特别地,[C _(10)C _(10)IM] [BF _(4)]显示室温下的液晶行为,因此可能适用于在合成和催化中的预组织反应介质中的应用。 [C _(16)C _(16)IM] [BF _(4)]和相应的高氯酸盐对这些离子液体的液晶状态表现出强烈的非牛顿粘度行为的粘度研究。

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