Long-range ion-water and ion-ion interactions in aqueous solutions

Long-range ion-water and ion-ion interactions in aqueous solutions
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DOI:
10.1039/c4cp04759a
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发表时间:
2015-01-01
影响因子:
3.3
通讯作者:
Nilsson, Anders
Nilsson, Anders
中科院分区:
化学2区
文献类型:
--
作者:
Chen, Chen;Huang, Congcong;Nilsson, Anders

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使用小角X射线散射(SAXS),我们获得了关于水合多原子阴离子的结构的直接实验证据,其中水合作用与阳离子的水合作用完全不同(J. Chem. Phys.,2011,134,064513)。我们建议裸离子的大小和电荷密度不足以解释SAXS曲线中的差异。对于阳离子,离子-离子的贡献给出了一个突出的一阶衍射峰,而对于阴离子,低Q增强的SAXS曲线表明密度不均匀性作为结果的离子-水的相互作用。
Using small-angle X-ray scattering (SAXS), we obtained direct experimental evidence on the structure of hydrated polyatomic anions, with hydration effects starkly different from those of cations (J. Chem. Phys., 2011, 134, 064513). We propose that the size and charge density of the naked ions do not sufficiently account for the differences in the SAXS curves. For cations, the ion-ion contribution gives a prominent first-order diffraction peak, whereas for anions, the low-Q enhancement in the SAXS curves indicates density inhomogeneities as a result of ion-water interactions.