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IR Spectrum Table & Chart - Sigma-Aldrich

Frequency Range Absorption (cm‑1) Appearance Group Compound Class Co... 4000‑3000 cm‑1 3700‑3584 medium, sharp O‑H stretching alcohol free 3550‑3200 strong, broad O‑H stretching alcohol inter... 3500 medium N‑H stretching primary amine

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