Nuclear magnetic resonance of silica polymorphs
Nuclear magnetic resonance of silica polymorphs
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DOI：
10.1038/303223a0
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发表时间：
1983-05
期刊：
影响因子：
64.8
通讯作者：
J. V. Smith;C. Blackwell
中科院分区：
文献类型：
--
作者：
J. V. Smith;C. Blackwell
用实验和理论两种方法研究了硅多晶和硅酸盐的化学键。以八面体（魔角）旋转会在29si（参考文献2）和27al（参考文献3）的核磁共振模式中产生尖锐的峰值。我们报道了7种二氧化硅多晶态的魔角旋转（MAS）光谱，并根据x射线衍射确定的原子间距离和角度来解释化学位移。研究结果为框架型铝硅酸盐，特别是沸石分子筛光谱的定量解释提供了部分依据；铝取代和非框架原子4的其他影响将需要评估。
The chemical bonding in silica polymorphs and silicates is being studied by both experimental and theoretical methods1. Spinning at the octahedral (magic) angle yields sharp peaks in the NMR patterns for29Si (ref. 2) and27Al (ref. 3). We report magic angle spinning (MAS) spectra for seven polymorphs of silica and interpret the chemical shifts empirically in terms of interatomic distances and angles determined by X-ray diffraction. The conclusions provide a partial basis for quantitative interpretation of spectra for framework aluminosilicates, especially zeolite molecular sieves; additional effects from aluminium substitution and non-framework atoms4will need to be evaluated.