The first observation of heteronuclear two-bond J-coupling in the solid state: crystal structure and solid-state NMR spectroscopy of Rb(4)(NbO)(2)(Si(8)O(21)).
The first observation of heteronuclear two-bond J-coupling in the solid state: crystal structure and solid-state NMR spectroscopy of Rb(4)(NbO)(2)(Si(8)O(21)).
复制标题
固态异核二键J耦合的首次观察：Rb(4)(NbO)(2)(Si(8)O(21))的晶体结构和固态NMR谱。
DOI：
10.1021/ic0204373
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发表时间：
2002
影响因子：
4.6
通讯作者：
K. Lii
中科院分区：
文献类型：
--
作者：
H. Kao;K. Lii
报道了标题化合物的高温高压水热合成及其（93）Nb和（29）Si MAS NMR谱。（29）Si MAS NMR谱显示对应于结构中的四个不同Si位点的四个信号。三个信号显示由（93）Nb（自旋-（9）/（2））-（29）Si J-耦合产生的多重态图案。这是固态四极核和自旋为1/2的核之间的双键J耦合的第一个例子。结合（93）Nb和（29）Si固态NMR和X射线衍射数据，提供了NMR相互作用参数与局部结构之间的相关性。这一工作为研究固体中J耦合与结构参数之间的关系提供了新的机会。
High-temperature, high-pressure hydrothermal synthesis of the title compound and its (93)Nb and (29)Si MAS NMR spectra are reported. The (29)Si MAS NMR spectrum shows four signals corresponding to the four distinct Si sites in the structure. Three signals show multiplet patterns which arise from (93)Nb(spin-(9)/(2))-(29)Si J-coupling. This is the first example of two-bond J-coupling between a quadrupolar nucleus and a spin-(1)/(2) nucleus in the solid state. A combination of (93)Nb and (29)Si solid-state NMR and X-ray diffraction data has provided a correlation between NMR interaction parameters and local structure. This work opens a new opportunity to examine the relationship between (2)J-coupling and structural parameters in the solid state.