FTIR PEAK INTERPRETATION
What absorbs at 2318 cm⁻¹ in an FTIR spectrum?
A band near 2318 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 1 cited source
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Methoxy (OCH3) | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| C-O single bond | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| S s | 1 | 1 | 1.0 |
| Thiocarbonyl | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
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Thiocarbonyl confidence 1.0
“Two new strong absorption peaks occurred at 2318.44 and 503.42 which are separately attributed to C=S-S and C-O-S coupled vibrations.”
Flotation Performance, Structure-Activity Relationship and Adsorption Mechanism of O-Isopropyl-N-Ethyl Thionocarbamate Collector for Elemental Sulfur in a High-Sulfur Residue DOI: 10.3390/met
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