For each IR (one is crude and one is pure furoin) show what functional groups ar
ID: 1041514 • Letter: F
Question
For each IR (one is crude and one is pure furoin) show what functional groups are present in each.
Rocrystalli2-es furoin 28 1428:15 2018 (GMT-05:00) 184472 301217 3583,14 & 3376.36 -0€ 3758 86 3125,18 2521.54 2410.56 230000 2005.40 3421,17 2125.88 2156 50 2. 38 5.8.8 3 8 8 1150.74 07047 2986.89 *Transmittance ZF 799 3054.50 173472 1804. 34 54514994 1421.67 138573 1676.77 1571.19 1580.84 1552.30 berze Do S901 PO Boiro 929.85 909.44 896.20 884.7 848 35 1265.57 741.36 705.38 474.86 05 297 1000 4000 1500 3500 3000 2500 2000 Wavenumbers (cm-1) on Mar 26 14:28:45 2018 (GMT-05:00) VD PEAKS: Spectrum: Mon Mar 26 14:28:15 2018 (GMT-05:00) Region: 4000.00 400.00 Absolute threshold: 89.365 Sensitivity: 93 Peak list: Position: 462.50 Intensity: 0.398 Position: 474.66 Intensity: 0.630 Position: 664.47 Intensity: 61.257 Position: 705.38 Intensity: 3.379 Position: 741.36 Intensity: 1.182 Position: 848.35 Intensity: 80.804 Position: 884.67 Intensity: 68.526 Position: 896.28 Intensity: 48.499Explanation / Answer
First Picture
Peaks with interpretation :
Diagnostic region is 1500 cm-1 to 4000 cm-1
1. Broad peaks with sharp lines at 3400 cm-1 and 3700 cm-1 = Presence of -OH group where peak at 3400 cm-1 represents Hydrogen bonded -OH and peak at 3700 cm-1 represents free -OH group.
2. Peak at 2900 cm-1 is the characteristic peak of sp3 -C-H streching. No doublet is observed due to presence of only one H atom.
3. Peak at 3054 cm-1 is the characteristic peak of sp2 =C-H streching.
4. Peak at 1676 cm-1 represents carbonyl (C=O) streching. This lower frequency corresponds to conjugated C=O group.
Fingerprint region is 400 cm-1 to 1500 cm-1
5. Multiple bands near 1550 cm-1 represents aromatic C=C streching.
6. Multiple bands near 1400 cm-1 represents sp3 C-H Bending.
Second Picture
Peaks with interpretation :
Diagnostic region is 1500 cm-1 to 4000 cm-1
1. Broad peaks from 3300 cm-1 to 3600 cm-1 represents the O-H groups. The moderately sharp peak near 3350 cm-1 represents hydrogen bonded -OH group.
2. Peak at 2849 cm-1 and 2812 cm-1 is the characteristic peak of sp3 -C-H streching. Doublet is observed due to presence of symmetric and antisymmetric streching.
3. Peak at 3133 cm-1 is the characteristic peak of sp2 =C-H streching.
4. Peak at 1673 cm-1 represents carbonyl (C=O) streching. This lower frequency corresponds to conjugated C=O group.
Fingerprint region is 400 cm-1 to 1500 cm-1
5. Multiple bands in the range 1400 cm-1 to 1600 cm-1 represents aromatic C=C streching.
6. Multiple bands near 1350 cm-1 represents sp3 C-H Bending.
Conclusion : If the first compound be recrystalline Furoin, then the presence of broad -OH peak and sp3 C-H doublet streching may correspond to some solvent impurity. Free -OH groups can make H-bond with solvent and the sp3 C-H doublet streching may come from the same solvent.
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