What absorbs at 543 cm⁻¹ in an FTIR spectrum?
A band near 543 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 4 cited sources
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Aromatic ring | 2 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Metal oxygen | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Hydroxyl (O-H) confidence 1.0
“For the s5 sample, 3,543cm-1 samples showed SF values greater than 3.86, and 37% of the however, the hydroxyl peak remained relatively stable”
Li 等 - 2023 - Fourier-transformed infrared spectroscopy study of DOI: 10.3389/feart.2022.1008139 -
Metal oxygen confidence 1.0
“Stretching vibration of O-H is formed at 3430 In graph (c) two peaks cm-1 cm-1 (Bi-O)58 at 543 and 855 with corresponding functional groups and (Bi-O-Bi) confirms the successful synthesis of Bi 2O 3/GO composite.”
Antibacterial and in vivo toxicological studies of Bi2O3/CuO/GO nanocomposite synthesized via cost effective methods DOI: 10.1038/s41598-022-17332-7 -
Alkyl C-H confidence 1.0
“Figure 2, is really interesting to see that it is due to the 531cm-1 543cm-1 is assigned to Experimental peak of CH out of plane bending motion and we can clearly see B3LYPwhichisacombinationofdifferentmotionsincluding that there is only on”
Ullah 等 - 2016 - Fourier Transform Infrared Spectroscopy of Bisphe DOI: 10.1155/2016/2073613 -
Aromatic ring confidence 1.0
“The CH out-of-plane bending vibrations of the phenyl ring nyl rings is observed at 543 cm-1.”
Modeling and Simulation of Fabricated Graphene Nanoplates/Polystyrene Nanofibrous Membrane for DCMD DOI: 10.3390/polym13172987
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