期刊
JOURNAL OF MAGNETIC RESONANCE
卷 333, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2021.107091
关键词
Electron Nuclear Double Resonance; Chemical Shifts; High-Field EPR; Spectral Simulation; Distance Measurements
资金
- Max Planck Society
- IMPRS-PBCS of the Max Planck Society
- Deutsche Forschungsgemeinschaft (DFG) [SFB 1456, 423268549 (INST 186/1327-1 FUGG)]
- Nds. Ministerium far Wissenschaft und Kultur
Pulsed F-19 ENDOR spectroscopy is a selective method for measuring distances in structural biology, with pronounced asymmetric features observed at 9.4 T due to chemical shift anisotropy. CSA parameters are consistent with DFT predicted values and can be extracted from experimental data simulations.
Pulsed F-19 ENDOR spectroscopy provides a selective method for measuring angstrom to nanometer distances in structural biology. Here, the performance of F-19 ENDOR at fields of 3.4 T and 9.4 T is compared using model compounds containing one to three F-19 atoms. CF3 groups are included in two compounds, for which the possible occurrence of uniaxial rotation might affect the distance distribution. At 9.4 T, pronounced asymmetric features are observed in many of the presented F-19 ENDOR spectra. Data analysis by spectral simulations shows that these features arise from the chemical shift anisotropy (CSA) of the F-19 nuclei. This asymmetry is also observed at 3.4 T, albeit to a much smaller extent, confirming the physical origin of the effect. The CSA parameters are well consistent with DFT predicted values and can be extracted from simulation of the experimental data in favourable cases, thereby providing additional information about the geometrical and electronic structure of the spin system. The feasibility of resolving the CSA at 9.4 T provides important information for the interpretation of line broadening in ENDOR spectra also at lower fields, which is relevant for developing methods to extract distance distributions from F-19 ENDOR spectra. (C) 2021 The Authors. Published by Elsevier Inc.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据