Neutron diffraction study of the structure of saturated sodium-ammonia solutions
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- 作者：Wasse ; Jonathan C. ; Stebbings ; Sarah L. ; Masmanidis ; Sotiris ; Hayama ; Shusaku ; Skipper ; Neal T.
- 刊名：Journal of Molecular Liquids
- 出版年：2002
- 出版时间：April, 2002
- 年：2002
- 卷：96-97
- 期：Complete
- 页码：341-352
- 全文大小：862 K
文摘
The structure of saturated solutions of sodium in ammonia at 200 K has been measured by using the method of isotope substitution in neutron diffraction. Substitution of *N by 15N, combined with difference analysis, yields detailed structural information about the local environment around the host solvent. We find that the solutions are structured over both short- and intermediate-length scales. The solvent structure is significantly “stretched” due to the presence of excess valence electrons, which reduce the overall density. The data are consistent with five-fold ammoniation of sodium, with a nearest neighbour Na
N distance of 2.45(2) Å. Contacts between solvated sodium ions then give rise to a first diffraction peak at 0.85(3) Å−1.
N distance of 2.45(2) Å. Contacts between solvated sodium ions then give rise to a first diffraction peak at 0.85(3) Å−1.