Investigation of slow molecular dynamics using R-CODEX.

Investigation of slow molecular dynamics using R-CODEX.
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DOI:
10.1016/j.jmr.2012.05.019
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发表时间:
2012-09
影响因子:
2.2
通讯作者:
McDermott, Ann
McDermott, Ann
中科院分区:
化学3区
文献类型:
--
作者:
Li, Wenbo;McDermott, Ann

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介绍了一种基于1H-13 C或1H-15 N偶极耦合的移相和重聚焦的固态NMR实验,用于探测毫秒时间尺度上的运动。该方法与先前描述的交换或CODEX实验的仅中心带检测有关。R型偶极再偶联序列的使用利用了强的1H-13 C或1H-15 N偶极偶联,同时抑制了1H-1H同型偶联的影响。这种方法为检测完全质子化样品中动力学的相关时间和重取向角铺平了道路。使用咪唑甲基磺酸盐证明了该脉冲序列的性能。
A solid state NMR experiment is introduced for probing motions on the millisecond time scale, based on dephasing and refocusing 1H-13C or 1H-15N dipolar couplings. The method is related to the previously described Centerband-Only Detection of Exchange or CODEX experiment. The use of an R-type dipolar recoupling sequence takes advantage of the strong 1H-13C or 1H-15N dipolar coupling, while suppressing the effect of 1H-1H homonuclear coupling. This approach paves the way to detect both the correlation time and reorientational angle of the dynamics in fully protonated samples. The performance of this pulse sequence is demonstrated using imidazole methyl sulfonate.
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