Question

this is the IR spectra of euganol. please explain how you would know this is euganol by looking at this spectra (mention which molecules are present and how you know etc)

%Transmittance 4000 3500 3523.69 From: 04:05 2019 (GMT-04:00) 3000 3058.79 3002 2936.14 2841.29 2500 Wavenumbers (cm-1) 2000 2153.67 1511.03 1682.05 1557.07 1693.76 1637.05 1760.05 1605.72 1500 1463.02 1450 27 1284.83 1231.78 1203.41 1121.07 1430.41 1366.30 1147.75 1033.40 994.19 1000 912.77 817.35 793.84 738.12 850.13 701.83 647.77 596.62 500 556.50 447.09 419.93 402.16

Answer 1

The chemical structure of euganol is shown below.

The functional groups present are phenolic-OH group, methyl aryl ether, benzene ring and olefin. In the IR spectrum, look for the absorbances that corresponds to above functional groups.

Phenolic -OH stretching vibrations are observed as a strong, broad peak at around 3523$cm^{-1}$.

A low to medium intensity band at 994$cm^{-1}$ represents vinyl (C=C of olefine) group.

The peaks in the region 1500 $cm^{-1}$ to 1605 $cm^{-1}$ represent aromatic benzene ring.

The peaks in the region 1121 $cm^{-1}$ and 1264 $cm^{-1}$ corresponds to methyl aryl ether.