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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Investigations of Uranyl Fluoride Sesquihydrate (UO2F2 center dot 1.57H(2)O): Combining F-19 Solid-State MAS NMR Spectroscopy and GIPAW Chemical Shift Calculations
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Investigations of Uranyl Fluoride Sesquihydrate (UO2F2 center dot 1.57H(2)O): Combining F-19 Solid-State MAS NMR Spectroscopy and GIPAW Chemical Shift Calculations

机译:氟烷基均匀水合物的研究(UO2F2中心点1.57H(2)O):组合F-19固态MAS NMR光谱和Gipaw化学换算计算

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摘要

High-resolution F-19 magic-angle spinning (MAS) NMR spectra were obtained for the uranium-bearing solid uranyl fluoride sesquihydrate (UO2F2 center dot 1.57H(2)O). While there are seven distinct crystallographic fluorine sites, the F-19 NMR spectrum reveals six peaks at -33.3, 9.1, 25.7, 33.0, 39.0, and 48.2 ppm, with the peak at 33.0 ppm twice the intensity of all the others and therefore corresponding to two sites. To assign the peaks in the experimental spectra to crystallographic sites, F-19 chemical shifts were calculated using the gauge including projector augmented waves (GIPAW) plane-wave pseudopotential approach for a DFT-optimized crystal structure. The peak assignments from DFT are consistent with two-dimensional double-quantum F-19 MAS NMR experiments.
机译:获得高分辨率F-19魔角纺丝(MAS)NMR光谱,用于含铀的固体铀酰均匀水合物(UO2F2中心点1.57H(2)O)。 虽然有七种不同的晶体氟位点,但F-19 NMR谱显示在-33.3,9.1,25.7,33.0,39.0和48.2ppm的六个峰,峰值为33.0ppm的两倍,因此相对相应 到两个网站。 为了将实验光谱中的峰分配给晶体位点,使用包括投影仪增强波(Gipaw)平面波伪软件方法的测量仪计算F-19化学换档,用于DFT优化的晶体结构。 DFT的峰值分配与二维双量子F-19 MAS NMR实验一致。

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