What absorbs at 2849 cm⁻¹ in an FTIR spectrum?
A band near 2849 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 8 cited sources
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Alkyl C-H | 17 | 13 | 1.0 |
| Aldehyde (CHO) | 1 | 1 | 0.95 |
| Methyl | 1 | 1 | 0.9 |
| Aromatic ring | 1 | 1 | 0.9 |
| Carbonyl (C=O) | 1 | 1 | 0.7 |
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
“Explicitly assigned to C-H stretching.”
Ghaforinejad 等 - 2021 - Molecular separation of ions from aqueous solution DOI: 10.1038/s41598-021-89371-5 -
Alkyl C-H confidence 1.0
“Corresponded to C-H stretches of -CH and -CH2 units.”
Luo 等 - 2019 - A Mechanism for the Adsorption of 2-(Hexadecanoyla DOI: 10.3390/min9010015 -
Alkyl C-H confidence 0.95
“Explicit assignment in text: 'at 2849 is assigned to s(CH2)'”
Aamouche 和 Goormaghtigh - 2008 - FTIR-ATR biosensor based on self-assembled phospho DOI: 10.3233/SPE-2008-0351 -
Aldehyde (CHO) confidence 0.95
“Explicit assignment: '2,849.2 for aldehydes (H-C = O: C-H stretch)'.”
Al-Baldawi 等 - 2020 - Role of Salvinia molesta in biodecolorization of m DOI: 10.1038/s41598-020-70740-5 -
Alkyl C-H confidence 0.95
“Text: 'C-H stretch typical of alkane compounds at 2849.18'”
Tavares 等 - 2016 - Conductive Paper with Antibody-Like Film for Elect DOI: 10.1038/srep26132 -
confidence 0.9
“explicit assignment in text”
Al-Emam 等 - 2021 - Removal of a Past Varnish Treatment from a 19th-Ce DOI: 10.3390/polym13162651 -
Alkyl C-H confidence 0.9
“Same as above.”
Faiza 等 - 2023 - Improved PVCZnO Nanocomposite Insulation for High DOI: 10.1038/s41598-023-31473-3 -
Alkyl C-H confidence 0.9
“Text: 'cm-1 at 2849 The peak ... is due to the C-H group'”
Gurmen Ozcelik - 2017 - Preparation, Characterization and Thermal Properti DOI: 10.5755/j01.ms.23.1.13661
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