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Chemistry

The Principle of Spin-Spin Coupling in NMR

Quick fact

Spin-spin coupling is transmitted through the bonding electrons, not through space, so it can reveal which atoms are directly bonded or close in a molecular chain.

Why this is interesting

You've seen an NMR spectrum with a quartet instead of a single peak—why has one type of proton split into multiple signals? The answer lies in a quantum conversation between nearby nuclei.