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In H-NMR spectroscopy, the coupling of two hydrogen atoms on adjacent carbon atoms is called vicinal coupling. The coupling constant J represents coupling of vicinal hydrogen atoms because they couple through three bonds. Depending on the other substituents, the vicinal coupling constant is typically a value between … 展开
In chemistry the descriptor vicinal (from Latin vicinus = neighbor), abbreviated vic, is a descriptor that identifies two functional groups as bonded to two adjacent carbon atoms (i.e., in a 1,2-relationship). It may arise from 展开
CC-BY-SA 许可证中的维基百科文本 NMR - Interpretation - Chemistry LibreTexts
2023年1月30日 · The Vicinal coupling is the most useful information of dihedral angle, leading to stereochemistry and conformation of molecules. Vicinal …
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Vicinal 1H-1H coupling constants (3JHH) are particularly useful for molecular structure studies. In the late 1950’s and early 1960’s, Martin Karplus established a relationship between the …
偶合常数 - 百度百科
- 峰裂距即偶合常数
在磁场作用下，分子中的质子会产生自旋，邻近质子之间也会产生相互影响从而影响对方的核磁共振吸收，这种相互作用称为自旋偶合，自旋偶合的度量称为自旋的偶合常数（coupling constant）。
- 峰裂距即偶合常数
Nuclear Magnetic Resonance (NMR) of Alkenes
2023年1月23日 · Cis and trans coupling appear differently on 1 H NMR spectrum. Here are a couple of terms to know: Vicinal - Coupling between hydrogens on adjacent carbons. Geminal - Coupling between nonequivalent …
Spin-spin splitting and coupling - Coupling in 1H NMR
For the example of vicinal coupling (3 intervening bonds), the B n field is negative for H X in the alpha spin state; for geminal coupling B n is positive for H X in the alpha spin state. Geminal coupling occurs between protons of …
6.7 ¹H NMR Spectra and Interpretation (Part II)
The most typical coupling we observed in this course is from non-equivalent vicinal hydrogens that are 3 bonds away, that is the hydrogens on adjacent carbons. This is also called vicinal coupling or three-bond coupling .
14.20: DEPT \(^{13}C\) NMR Spectra - Chemistry …
The Vicinal coupling is the most useful information of dihedral angle, leading to stereochemistry and conformation of molecules. Vicinal coupling constant always has the positive value and is affected by the dihedral angle (?;HCCH), the …
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling) - JoVE
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions …
Dual-coupling-guided epitaxial growth of wafer-scale single
2021年11月15日 · A dual-coupling-guided growth mechanism enables the realization of wafer-scale single-crystal WS2 on vicinal a-plane sapphire.
