Chemical shift tensor determination using magnetically oriented microcrystal array (MOMA): 13C solid-state CP NMR without MAS
Chemical shift tensor determination using magnetically oriented microcrystal array (MOMA): 13C solid-state CP NMR without MAS
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DOI：
10.1016/j.jmr.2012.08.006
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发表时间：
2012-10-01
影响因子：
2.2
通讯作者：
Kimura, T.
中科院分区：
文献类型：
--
作者：
Kusumi, R.;Kimura, F.;Kimura, T.
用磁性取向微晶阵列（MOMA）测定了L-丙氨酸晶体中羧基和甲基碳的化学位移张量。MOMA是一种单晶状复合材料，其中微晶在基质树脂中三维排列。将单晶旋转方法应用于MOMA，确定了化学位移张量的主值和主轴。计算结果与文献中L-丙氨酸单晶的计算结果吻合较好。这表明，本技术是一个强大的工具，用于确定从微晶粉末样品的晶体的化学位移张量。(C)2012 Elsevier Inc. All rights reserved.
Chemical shift tensors for the carboxyl and methyl carbons of L-alanine crystals were determined using a magnetically oriented microcrystal array (MOMA) prepared from a microcrystalline powder sample of L-alanine. A MOMA is a single-crystal-like composite in which microcrystals are aligned three-dimensionally in a matrix resin. The single-crystal rotation method was applied to the MOMA to determine the principal values and axes of the chemical shift tensors. The result showed good agreement with the literature data for the single crystal of L-alanine. This demonstrates that the present technique is a powerful tool for determining the chemical shift tensor of a crystal from a microcrystal powder sample. (C) 2012 Elsevier Inc. All rights reserved.