SOLID-STATE O-17 MAGIC-ANGLE AND DYNAMIC-ANGLE SPINNING NMR-STUDY OF THE SIO2 POLYMORPH COESITE
SOLID-STATE O-17 MAGIC-ANGLE AND DYNAMIC-ANGLE SPINNING NMR-STUDY OF THE SIO2 POLYMORPH COESITE
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DOI：
10.1021/j100032a045
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发表时间：
1995-08-10
影响因子：
--
通讯作者：
PINES, A
中科院分区：
文献类型：
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作者：
GRANDINETTI, PJ;BALTISBERGER, JH;PINES, A
用11.7T的动态角度旋转(DAS)和9.4和11.7T的幻角旋转(MAS)谱，在室温柯石英(一种SiO_2多晶型)中观察和指认了五个明显分辨的O-17固体核磁共振波谱。柯石英中五个氧环境的O-17四极参数与由衍射实验确定的Si-O-Si桥键角相关联。通过对数据的Townes-Dailey分析，确定了e(2)qq/h的符号以及Si-O-Si键中氧的电场梯度的方向。
Five distinctly resolved O-17 solid-state NMR resonances in room temperature coesite, an SiO2 polymorph, have been observed and assigned using dynamic-angle spinning (DAS) at 11.7 T along with magic-angle spinning (MAS) spectra at 9.4 and 11.7 T. The O-17 quadrupolar parameters for each of the five oxygen environments in coesite are correlated with the Si-O-Si bridging bond angles determined by diffraction experiments. The sign of e(2)qQ/h along with the orientation of the electric field gradient for oxygen in the Si-O-Si linkage were determined from a Townes-Dailey analysis of the data.