FTIR Region (cm−1)

Suggested groups from FTIR of empty sporopollenin

4000 - 2000

§ 3416 cm−1 (medium, broad) indicates the presence of hydroxyl OH groups.

§ 2925 cm−1 (strong, sharp) and 2855 cm−1 (strong, sharp but less intense). Likely to be due to CH2 stretching frequencies for saturated carbons.

1750 - 1560

§ All showed broad peak in this region which indicates the presence of C=O containing groups (peak at 1712 cm−1).

§ No absorption around 1750 - 1735 cm−1, the region characteristic of ester.

1200 - 1000

§ broad, variable ethers (C-O ν) at 1138 cm−1

848

§ medium aromatic (C-H) out of plane wagging.