2015年1月1日 · The 17 O NMR chemical shifts at the sulphonyl (–SO 2 –) and at the single bonded phenoxy (–OPh) groups have been used as input for a dual substituent parameter regression analysis. Substituent effects and free energy relationships for a large collection of 1,3,4-oxadiazoles have also been reported by Gierczyk et al. on the basis of 17 O ...

Oxygen has one naturally occurring NMR active nucleus, 17 O. It has a spin of 5/2 and is therefore quadrupolar, yielding broad signals even for the smallest of molecules that become too broad to observe in a high resolution spectrometer even for medium sized molecules.

17 O NMR spectroscopy is a powerful method for the detection of steric effects in molecules in which steric interactions are characterized by rotation of functional groups around single bonds to relieve van der Waals interactions or on rigid systems in which steric interactions are partially accommodated by bond angle and bond length ...

本综述重点关注液相17 O 核磁共振 (NMR) 在无机、有机和生化分子中应用的最新成就，重点关注其结构、构象和（生物）化学行为。 综述由四个基本部分组成，即：（1）简单分子； (2)水与氢键； (3)金属氧化物、簇合物和络合物； (4)生物分子。 实验17 O NMR 化学位移已彻底制成表格。 对于无机和有机分子，它们的范围几乎高达 650 ppm（从 -35.6 到 +610.0 ppm），而对于生物物种，这个范围要宽得多，约为 1350 ppm（从 -12 到 +1332 ppm），对于血红素蛋白和血红素 …

As the only stable isotope of oxygen possessing a nuclear spin (+ ⁄) and a favorable characteristic of field-independent relaxation in liquid water, 17 O enables NMR studies of oxidative metabolic pathways through compounds containing 17 O (i.e. metabolically produced H 217 O water by oxidative phosphorylation in mitochondria [3]) at high magnet...

17 O NMR spectroscopy is a promising approach to reveal the interaction network and dynamic features of these water molecules. Also, understanding the physiological events associated with these structured water molecules may contribute to developing novel modulation strategies for therapeutic purposes.

2022年10月11日 · 本文讨论了阴离子氧化还原背景下的17O NMR，以及该技术在理解高容量正极的电荷补偿机制中可能发挥的作用，并给出了在未来的研究中采用17O NMR的建议。 【17O NMR中的主要相互作用】 1、化学位移. 化学位移是由原子核周围的电子屏蔽所施加的磁场而产生的，17O化学位移跨度较大，（约-100 ppm到+2500 ppm)；相比之下，Li化学位移的跨度小于10 ppm。 虽然由于顺磁中心的存在（在合成或循环过程中形成），化学位移很少主导Li TM O2 …

2010年3月1日 · PDF | Some of the basic principles and applications of oxygen-17 NMR spectroscopy are discussed. Researchers have significant efforts to provide... | Find, read and cite all the research you need...

2015年1月1日 · On the basis of this theoretical framework, we discuss general features of quadrupole-central-transition (QCT) NMR, which is a particularly powerful method of studying biomolecules in the slow motion regime. Then we review recent advances in 17 O QCT NMR studies of biological

2017年9月18日 · In combination with density functional theory calculations, we show that the oxygen ions on the exposed (001) and (101) facets of anatase titania nanocrystals have distinct 17 O NMR shifts, which...