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wht is da difference b/w H bonded alcohol nd free alcohol in IR spectroscopy? ny1 knws?
The IR sepectrum gives different peaks for A free bonded alcohol and a hydrogen bonded alcohol
A hydrogen bonded alchol has a BROADER peak then Free alcohol
check this https://webspectra.chem.ucla.edu/cgi-bin/webspectra.cgi/rp5/I/rp4/I?Zoom=141
RED = dilute t-butanol in choloroform
BLUE = Conc - butanol
An hydrogen bonded alcohol means = more molecular contact (e.g concentrated Alcohol) = more hydrogen bonding thus in a sample there are more -OH to absorb the infrared waves thus a broad peak.
a free alchol means = less molecular contact (e.g dil alchol or alchol in gas phase) thus in a sample there are less -OH to absorb the infrared waves thus a sharp peak.