What absorbs at 2937 cm⁻¹ in an FTIR spectrum?
A band near 2937 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 6 cited sources
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Alkyl C-H | 6 | 4 | 1.0 |
| C-O single bond | 1 | 1 | 0.9 |
| Methyl | 1 | 1 | 0.8 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Alkyl C-H confidence 1.0
“Assigned to CH2 in text.”
Lee 等 - 2023 - Effect of Repeated Contact to Food Simulants on th DOI: 10.3390/polym15010009 -
Alkyl C-H confidence 0.9
“Explicitly assigned as C-H contraction vibration in methyl group.”
Li 等 - 2022 - Characterization and Application in Packaging Grea DOI: 10.3390/polym14153199 -
C-O single bond confidence 0.9
“Text: '1123, 1320, 1579, and 2937/cm corresponding to the C-O-C stretches of acetyl groups'.”
Mahmood 等 - 2023 - Aloe vera-Based Polymeric Network A Promising App DOI: 10.3390/gels9060474 -
Alkyl C-H confidence 0.9
“Explicit assignment in text”
Pinzon-Moreno 等 - 2022 - Degradation of Hydrogels Based on Potassium and So DOI: 10.3390/polym14132656 -
Methyl confidence 0.8
“Peak at 2937 assigned to methyl and methylene symmetric and asymmetric stretching vibration.”
Zhao 等 - 2021 - Evaluation of a strawberry fermented beverage with DOI: 10.7717/peerj.11974 -
confidence 0.7
“stretching of saturated”
Liu 等 - 2016 - Thermal degradation properties of biobased iron al DOI: 10.1007/s10853-015-9435-9.
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