School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, UK.
J Magn Reson. 2013 Oct;235:1-5. doi: 10.1016/j.jmr.2013.07.005. Epub 2013 Jul 18.
A new proton anisotropic-isotropic shift correlation experiment is described which operates with ultrafast MAS, resulting in good resolution of isotropic proton shifts in the detection dimension. The new experiment makes use of a recoupling sequence designed using symmetry principles which reintroduces the proton chemical shift anisotropy in the indirect dimension. The experiment has been used to measure the proton shift tensor parameters for the OH hydrogen-bonded protons in tyrosine·HCl and citric acid at Larmor frequencies of up to 850 MHz.
描述了一种新的质子各向异性-各向同性位移相关实验，该实验采用超快 MAS 操作，在检测维度上实现了各向同性质子位移的良好分辨率。新实验利用基于对称原理设计的重耦序列在间接维度中重新引入质子化学位移各向异性。该实验已用于测量酪氨酸·HCl 和柠檬酸中 OH 氢键质子在高达 850 MHz 的拉莫尔频率下的质子位移张量参数。
