chemical shift

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June 24, 2026

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Chemical shift is a key concept in nuclear magnetic resonance (NMR) spectroscopy, a technique used to determine molecular structure. In proton NMR, the position of a peak on the spectrum, measured relative to a reference compound (tetramethylsilane), is called the chemical shift.12

This shift indicates the energy absorbed by hydrogen atoms and is influenced by their bonding environment and nearby electrons. Electrons shield the nucleus from the instrument's magnetic field, and atoms with higher electron density have a lower chemical shift. Conversely, electronegative atoms pull electrons away, causing a greater chemical shift. The chemical shift provides valuable information about the types of bonds surrounding hydrogen atoms in a molecule.12

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chemical compound
Proton magnetic resonance spectroscopy
…by a number called the chemical shift. Each unit of chemical shift represents a fractional increase of one part per million (ppm) in the energy of absorbed radiation, relative to the value for tetramethylsilane. For example, in the proton NMR spectrum of bromoethane, the hydrogen atoms of the CH₃ group…
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…by a number called the chemical shift. Each unit of chemical shift represents a fractional increase of one part per million (ppm) in the energy of absorbed radiation, relative to the value for tetramethylsilane. For example, in the proton NMR spectrum of bromoethane, the hydrogen atoms of the CH₃ group…
Read More