Chemistry · Biomolecules

The correct structure of Ruhemann's Purple, the compound formed in the reaction of Ninhydrin with amino acids/proteins is:

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1A diketone complex bound via a central carbon-nitrogen double bond without an anionic charge
2An anionic indane-1,3-dione derivative with a central resonance-stabilized nitrogen bridge linking two indane units✓
3A neutral dimeric amino acid ester linkage across two ninhydrin ring headers
4A chelated purple-colored magnesium-centered coordination complex of ninhydrin derivatives

Correct answer

An anionic indane-1,3-dione derivative with a central resonance-stabilized nitrogen bridge linking two indane units

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