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单词 Nuclear Magnetic Resonance spectrometry
释义

Nuclear Magnetic Resonance spectrometry

英语百科

Nuclear magnetic resonance spectroscopy

 A 900MHz NMR instrument with a 21.1 T magnet at HWB-NMR, Birmingham, UK
The NMR sample is prepared in a thin-walled glass tube - an NMR tube.
Example of the chemical shift: NMR spectrum of hexaborane B6H10 showing peaks shifted in frequency, which give clues as to the molecular structure. (click to read interpretation details)
Example 1H NMR spectrum (1-dimensional) of ethanol plotted as signal intensity vs. chemical shift.  There are three different types of H atoms in ethanol regarding NMR.  The hydrogen (H) on the -OH group is not coupling with the other H atoms and appears as a singlet, but the CH3- and the -CH2- hydrogens are coupling with each other, resulting in a triplet and quartet respectively.

Nuclear magnetic resonance spectroscopy, most commonly known as NMR spectroscopy, is a research technique that exploits the magnetic properties of certain atomic nuclei. It determines the physical and chemical properties of atoms or the molecules in which they are contained. It relies on the phenomenon of nuclear magnetic resonance and can provide detailed information about the structure, dynamics, reaction state, and chemical environment of molecules. The intramolecular magnetic field around an atom in a molecule changes the resonance frequency, thus giving access to details of the electronic structure of a molecule.

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更新时间:2025/6/23 14:02:24