chemical shift定义 化学位移(Chemical shift)是核磁共振(NMR)谱学中的一个重要参数,用于描述不同原子核在磁场中的化学环境下的化学位移差异。当原子核处于外部磁场中时,其周围电子云的电荷分布会对该核的局部磁场产生影响,从而导致核磁共振频率的微小偏移。 化学位移通常以"δ"表示,以相对于参考化合物(通常是三甲基...
Sharma D, Rajarathnam K (2000) 13C NMR chemical shifts can predict disulfide bond formation . J Biomol Nmr 18 : 165–171Sharma D., Rajarathnam K. (2000) J. Biomol. NMR 18 , 165–171Sharma D., Rajarathnam K. (2000) 13C NMR chemical shifts can predict disulfide bond formation . J...
13C NMR of β-AlcoxyvinylketonesSubstituent Effects13C NMR of Trisubstituted alkenesThis work presents the evaluation by empirically derived equations for the substituent effect (±, , , ) on the 13C NMR chemical shifts for C-1, C-2, C-3 and C-4 in -alcoxyvinylhalomethylketones 1ah ...
13C NMRChemical shift assignmentsCarbazole derivatives13C NMR chemical shift assignments have been made for a series of 1-substituted carbazoles, 8-substituted 1,2,3,4-tetra-hydrocarbazoles, 1-substituted benzo[a]carbazoles and 6-substituted dibenzo-[c,g]carbazoles. Single examples were examined ...
1 13 We therefore decided to collect H and C chemical dependent (vide infra). Also, any potential hydrogen- shifts of what are, in our experience, the most popular bond acceptor will tend to shift the water signal down- “extra peaks” in a variety of commonly used NMR field; this is...
chemical-shift-of-NMR网络核磁共振化学位移 网络释义 1. 核磁共振化学位移 chemical-英汉词典-英中字典-速译通... ... chemical shift of NMR [医]核磁共振化学位移 chemical shift reagent 化学位移试剂 ... www.fastdict.net|基于7个网页© 2024 Microsoft 隐私声明和 Cookie 法律声明 广告 帮助 反馈...
The 13C NMR chemical shift of sp3 carbon atoms situated in the 伪 position relative to the double bond in acyclic alkenes was estimated with multilayer feedforward artificial neural networks (ANNs) and multilinear regression (MLR), using... O Ivanciuc,JP Rabine,D Cabrol-Bass,... - 《Journal...
The ~(13)C NMR chemical shift of sp~2 carbon atoms in acyclic alkenes was estimated with multilayer feedforward artificial neural networks (ANNs) and multilinear regression (MLR), using as structural descriptors a vector made of 12 components encoding the environment of the resonating carbon atom...
Chemical shift 15-1-23Chemical shift - Wik ipedia, the free ency clopedia en.wik ipedia.org/wik i/Chemical_shift 1/7Chemical shift From Wikipedia, the free encyclopedia In nuclear magnetic resonance (NMR) spectroscopy, the chemical shift is the resonant frequency of a nucleus relative to ...
Solid-state NMR studies of the mechanism of the opsin shift in the visual pigment rhodopsin. Solid-state 13C NMR spectra have been obtained of bovine rhodopsin and isorhodopsin regenerated with retinal selectively 13C labeled along the polyene chai... SO Smith,I Palings,ME Miley,... - 《Bi...