What absorbs at 2311 cm⁻¹ in an FTIR spectrum?
A band near 2311 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 |
|---|---|---|---|
| Methacrylate | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| Carbon dioxide | 1 | 1 | 1.0 |
| Silicon hydride | 1 | 1 | 1.0 |
| Silicon (Si) | 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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Silicon (Si) confidence 1.0
“is assigned to OH free stretching due to adsorbed water, together with the band at 1635 cm-1 cm-1 3742 band assigned to Si-OH stretching [25,31,36] and 2311 assigned to Si-H cm-1.”
Saharan Dust Storm Aerosol Characterization of the Event (9 to 13 May 2020) over European AERONET Sites DOI: 10.3390/atmos13030493
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