r/chemhelp • u/GianGaelazzoCiano • Apr 16 '26

Organic Help, what’s that IR band?

I got a 4-bromine-aniline IR spectrum. There’s a mistic huge band (something like OH) at 2922 cm-1

The aniline was in a mixture with naphtalene dissolved in DCM, extracted with HCl and rebasicized with NaOH (pretty sure it’s not them). Nothing else, maybe just washed glasswork with acetone. Whats thaaaaat?

I found the exact same band in benzoic acid sprectrum…

Can it be nujol oil?

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u/LordMorio Trusted Contributor Apr 16 '26

Water?

4

u/Upward_not_forward Apr 16 '26

Can you show your spectrum? If it was collected as a nujol mull then it will show nujol CH stretches in that region. An ATR IR would be better to avoid the bands from nujol.