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Determination of P-31 Chemical Shift Tensor from Microcrystalline Powder by Using a Magnetically Oriented Microcrystal Array

机译:磁取向微晶阵列测定微晶粉末中P-31化学位移张量

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The P-31 chemical shift tensor for phenylphosphonic acid (PPA) was determined by using a magnetically oriented microcrystal array (MOMA)-a single-crystal-like composite in which microcrystals are aligned three-dimensionally in a polymer matrix-prepared from a microcrystalline powder of PPA. High-resolution P-31 NMR spectra were obtained for a PPA-MOMA without magic angle spinning (MAS), from which the chemical shift anisotropy (CSA) was determined. The single-crystal rotation method was applied to the MOMA to determine the principal axes of the P-31 chemical shift tensor with respect to the crystallographic axes. The present results demonstrate that the MOMA method can provide a powerful means of determining all of the information on P-31 CSA from a microcrystalline powder without MAS.
机译:苯膦酸(PPA)的P-31化学位移张量是通过使用磁取向微晶阵列(MOMA)来确定的-一种单晶状复合材料,其中微晶在由微晶制得的聚合物基质中三维排列PPA粉末。在没有魔术角旋转(MAS)的情况下,获得了PPA-MOMA的高分辨率P-31 NMR光谱,从而确定了化学位移各向异性(CSA)。将单晶旋转方法应用于MOMA,以确定相对于晶体学轴的P-31化学位移张量的主轴。目前的结果表明,MOMA方法可以提供一种强有力的手段,可以从不含MAS的微晶粉末中确定有关P-31 CSA的所有信息。

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