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.