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Incoming links: DPPH electron spin resonance experiment
2,2-Diphenyl-1-picrylhydrazyl Created 2026-10-13 Updated 2026-10-20
DPPH is a neutral organic radical used as a spin reference in electron paramagnetic resonance (EPR), also called electron spin resonance (ESR). Its unpaired electron remains bound within the chemical species: “free radical” does not mean a freely moving electron. The DPPH electron spin resonance experiment makes its magnetic moment observable.