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Structure of cyano-anion ionic liquids: X-ray scattering and simulations

机译:氰基阴离子离子液体的结构:X射线散射和模拟

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Ionic liquids with cyano anions have long been used because of their unique combination of low-melting temperatures, reduced viscosities, and increased conductivities. Recently we have shown that cyano anions in ionic liquids are particularly interesting for their potential use as electron donors to excited state photo-acceptors [ B. Wu et al., J. Phys. Chem. B 119, 14790-14799 ( 2015)]. Here we report on bulk structural and quantum mechanical results for a series of ionic liquids based on the 1-ethyl-3-methylimidazolium cation, paired with the following five cyano anions: SeCN-, SCN-, N(CN)(2)(-), C(CN)(3)(-), and B(CN)(4)(-). By combining molecular dynamics simulations, high-energy X-ray scattering measurements, and periodic boundary condition DFT calculations, we are able to obtain a comprehensive description of the liquid landscape as well as the nature of the HOMO-LUMO states for these ionic liquids in the condensed phase. Features in the structure functions for these ionic liquids are somewhat different than the commonly observed adjacency, charge-charge, and polarity peaks, especially for the bulkiest B(CN)(4)(-) anion. While the other four cyano-anion ionic liquids present an anionic HOMO, the one for Im(2,1)(+)/ B(CN)(4)(-) is cationic. Published by AIP Publishing.
机译:具有氰基阴离子的离子液体由于其低熔点温度,降低的粘度和增加的电导率的独特组合而长期使用。最近,我们已经表明,离子液体中的氰基阴离子作为其潜在的激发态光电子受体的电子供体特别有用[B. Wu等,J。Phys。化学B 119,14790-14799(2015)]。在这里,我们报告了一系列基于1-乙基-3-甲基咪唑鎓阳离子与下列五个氰基阴离子配对的离子液体的整体结构和量子力学结果:SeCN-,SCN-,N(CN)(2)( -),C(CN)(3)(-)和B(CN)(4)(-)。通过结合分子动力学模拟,高能X射线散射测量和周期性边界条件DFT计算,我们能够获得有关液体态势以及这些离子液体中HOMO-LUMO态性质的全面描述。浓缩阶段。这些离子液体的结构功能特征与通常观察到的邻接,电荷-电荷和极性峰有些不同,尤其是对于体积最大的B(CN)(4)(-)阴离子而言。虽然其他四种氰基阴离子离子液体呈现阴离子HOMO,但Im(2,1)(+)/ B(CN)(4)(-)的一种是阳离子的。由AIP Publishing发布。

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