A simple and fast method is introduced which eliminates the effects of a distribution of chemical shifts in NMR imaging. When the gradient-induced shift is not much larger than the distribution of chemical shifts, distortions are observed which smear the image and degrade the resolution. To ...
NMR chemical shift in PbTe and spin-orbit effects The observed large NMR chemical shift of Pb in PbTe is explained, within the framework of a k.π method, mainly through a contribution attributed to the sp... RL Hota,RC Patnaik,GS Tripathi,... - 《Phys Rev B Condens Matter》 被引量...
However, as shown in Table 2, the chemical shift anisotropy values are distinctive of the carbonyl group bonding. Sign in to download full-size image Figure 4. 119.05 MHz solid-state 31P NMR spectrum of diethyl phosphate spinning at the magic angle. νROT indicates the spinning frequency. ...
Good agreement between the experimental and both sets of calculated values is observed with the CHARGE calculations being more accurate for this series. This illustrates the utility of the CHARGE program for chemical shift assignments and also as a tool for the elucidation of chemical structures. ...
Interpreting a ^1H NMR spectrum involves analyzing the chemical shift values and the relative intensities of the peaks. Chemical shifts are reported in ppm and can be grouped into different regions, each corresponding to a specific chemical environment. The general regions include alkyl (0-3 ppm)...
由deshield就导出chemical shift向左移? 相关知识点: 试题来源: 解析 以H-NMR来说明 在外加磁场下 氢原子核的自旋有两种状态1/2和-1/2 当照射能量时 低能阶的自旋态会转成高能阶的状态 以吸收的能量作图 就可以得到吸收峰值 对于氢原子核来说 磁场会受到外围电子云的影响 电子云密度高 会遮蔽磁场 shield ...
The present invention discloses eight new reduced dimensionality (RD) triple resonance nuclear magnetic resonance (NMR) experiments for measuring chemical shift values of certain nuclei in a protein molecule. The RD 3D ... TA Szyperski 被引量: 0发表: 2002年 Inhibition of Alzheimer's amyloidosis ...
14.Assignment of 2β,16β-dipiperidino-5α-androstan-3α-ol-17-one in NMR2β,16β-双哌啶基-5α-雄甾烷-3α-醇-17-酮的化学位移指认 15.This thesis, through the change of the chemical shift values of aryl protons, predicts the directing effect of the substituenfs of aromatic systems an...
The NMR chemical shift method was applied for the determination of the magnetic susceptibility of paramagnetic transition metal complexes in solution. The method was found to be very useful for the determination of magnetic susceptibility changes during a chemical reaction in which one paramagnetic compou...
Chemical shift imaging combines the spatial information provided by a conventional nuclear magnetic resonance (NMR) image with the chemical shift spectral information provided by NMR spectroscopy. In order to preserve the chemical shift information and provide a spatial map simultaneously, new NMR imaging...