Department of Chemistry, Brooklyn College of the City University of New York, 2900 Bedford Ave., Brooklyn, NY 11210, USA.
Phys Chem Chem Phys. 2018 Jul 11;20(27):18639-18646. doi: 10.1039/c8cp02854k.
We report the results of X-ray scattering, physical, and spectroscopic measurements on a series of water-saturated trialkylamine/carboxylic acid mixtures. The results demonstrate the existence of well-defined nanoscale structures in bulk liquid mixtures at specific acid : amine ratios. These structures are analogous to those observed in ionic liquids but are driven by the formation of a hydrogen-bonded network rather than via inter-ion Coulomb forces. The results of the physical components of this study are closely analogous to prior observations on anhydrous, low molecular weight acid/amine mixtures, but this is to our knowledge the first time these observations have been augmented by the use of X-ray scattering. The results therefore bridge the gap between early work on amine/acid mixtures and recent studies of protic and pseudoprotic ionic liquids.
我们报告了一系列水饱和的三烷基胺/羧酸混合物的 X 射线散射、物理和光谱测量结果。结果表明，在特定的酸胺比下，在本体液体混合物中存在明确的纳米尺度结构。这些结构类似于在离子液体中观察到的结构，但不是由离子间库仑力驱动，而是由氢键网络的形成驱动。这项研究的物理成分的结果与之前对无水、低分子量酸/胺混合物的观察结果非常相似，但据我们所知，这是第一次通过 X 射线散射来增强这些观察结果。因此，这些结果弥合了早期关于胺/酸混合物的工作和最近关于质子和假质子离子液体的研究之间的差距。
