用固体回波双共振核磁共振法测定磷酸铝分子筛中平均27Al-31P距离
The determination of the average 27Al-31P distance in aluminophosphate molecular sieves with SEDOR NMR.
作者信息
van Eck E R, Veeman W S
机构信息
N.S.R. Center for Molecular Design, Synthesis and Structure, University of Nijmegen, Netherlands.
出版信息
Solid State Nucl Magn Reson. 1992 Feb;1(1):1-4. doi: 10.1016/0926-2040(92)90003-r.
The average 27Al-31P distances in an aluminophosphate, AlPO4-5, and in a silicoaluminophosphate, SAPO-11, were determined by using Spin Echo DOuble Resonance (SEDOR). A calculated SEDOR curve was fitted to the data in order to obtain the dipolar coupling constant. The tetrahedral surrounding of 27Al by four 31P atoms in the second coordination sphere was taken into account in the calculation of the theoretical SEDOR curve. The average 27Al-31P distances obtained by using this technique proved to be in good agreement with X-ray diffraction data.
通过自旋回波双共振（SEDOR）测定了磷酸铝（AlPO₄-5）和硅磷酸铝（SAPO-11）中²⁷Al与³¹P的平均距离。将计算得到的SEDOR曲线与数据进行拟合，以获得偶极耦合常数。在理论SEDOR曲线的计算中考虑了第二配位层中四个³¹P原子对²⁷Al的四面体配位环境。使用该技术获得的²⁷Al-³¹P平均距离与X射线衍射数据吻合良好。
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