Anisotropic, Organic Ionic Plastic Crystal Mesophases from Persubstituted Imidazolium Pentacyanocyclopentadienide Salts
作者:Karel Goossens、Lena Rakers、Benoît Heinrich、Guillermo Ahumada、Takahiro Ichikawa、Bertrand Donnio、Tae Joo Shin、Christopher W. Bielawski、Frank Glorius
DOI:10.1021/acs.chemmater.9b02338
日期:2019.12.10
pentacyanocyclopentadienide ([Cp(CN)5]−) counterions. Salts containing relatively small anions were obtained as low-melting solids, whereas those with [Cp(CN)5]− anions were found to be ionic liquids even below room temperature. A permethylated derivative, [(C1)5im][Cp(CN)5], proved to be exceptional. Upon heating, the salt self-organized into a new type of organic ionic plastic crystal (OIPC) mesophase, which was
我们描述的合成,超分子组织,和对称1,2,3,4,5- pentaalkylimidazolium空前家族的热特性([(C Ñ)5 IM] +)配备有卤化物,硝酸盐或pentacyanocyclopentadienide([盐Cp(CN)5 ] -)抗衡离子。获得了包含相对较小阴离子的盐,为低熔点固体,而发现具有[Cp(CN)5 ] -阴离子的盐甚至在室温以下仍为离子液体。全甲基化衍生物,[(C 1)5 im] [Cp(CN)5],被证明是例外。加热后,该盐自组织成新型有机离子塑料晶体(OIPC)中间相,称为M hex,其各向异性结构具有六边形有序旋转的阴离子叠层,该叠层位于由无序阳离子组成的连续区内。尽管没有长而柔性的链,中间相的结构类似于经典的柱状液晶相。在M十六进制中相中,阴离子柱周围的阳离子有效地发挥了“软化”结构成分的作用,与挠性链的作用方式大致相同。新型中间相的发现显示了二维的