From: Revealing the diversity of amber source plants from the Early Cretaceous Crato Formation, Brazil
Functional group | Band, wavelength [μm] | Band, wavenumber [cm−1] | Intensity | Assignment |
---|---|---|---|---|
O-H | 2.95 | 3390 | medium | Stretching of O-H bonds |
-CH2 -CH3 | 3.40 | 2940 | strong | Stretching of C-H bonds |
-CH2 -CH3 | 6.90 | 1450 | medium | Scissoring and bending of C-H bonds |
-CH2 -CH3 | 7.25 | 1380 | medium | Bending of C-H bonds |
-CH2 -CH3 | 11.39 | 878 | weak | C=CH2: out-of-plane bending of H in terminal methylene group |
-C=O | 5.80 | 1724 | medium | Stretching of C=O double bonds |
-C-O- | 8.15, 8.60 | 1227, 1163 | medium/weak | Absorption of C-O single bonds |
-C-O- | 9.60, 9.85 | 1042, 1015 | weak | Absorption of C-O single bonds (alcohol) |
C=C | 6.05 | 1654 | weak | C=C stretching |
-C-H aromatic | 12.10, 14.10 | 826, 709 | weak | Out-of-plane bending of aromatic C-H |