J-coupling
| Also Known As | Scalar coupling, spin-spin coupling, NMR coupling constant, vicinal coupling |
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What is J-coupling?
J-coupling (scalar coupling or spin-spin coupling) is the interaction between nuclear spins in NMR spectroscopy that is transmitted through chemical bonds. It causes splitting of NMR peaks into multiplets. The coupling constant J (measured in Hz) provides information about the number and type of neighboring atoms. J-coupling follows the n+1 rule: n equivalent neighboring protons split a signal into n+1 lines.
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
J-coupling (scalar coupling or spin-spin coupling) is the interaction between nuclear spins in NMR spectroscopy that is transmitted through chemical bonds. It causes splitting of NMR peaks into multiplets. The coupling constant J (measured in Hz) provides information about the number and type of neighboring atoms. J-coupling follows the n+1 rule: n equivalent neighboring protons split a signal into n+1 lines.
NMR structure determination of organic molecules. Determining dihedral angles and conformation. Identifying number of neighboring H atoms (n+1 rule). Confirming connectivity in organic molecules. Pharmaceutical structure elucidation. Protein structure determination by NMR. Measuring molecular dynami…
NMR spectrometers use strong magnetic fields — pacemakers/implants hazard. High-field instruments (>600 MHz) require oxygen monitoring (liquid He/N₂ quench risk). No chemical safety concern from J-coupling itself.