What absorbs at 2895 cm⁻¹ in an FTIR spectrum?
A band near 2895 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 | 2 | 2 | 1.0 |
| N-O bond | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Chitosan | 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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Chitosan confidence 1.0
“Similar peaks were also found in chitosan (3361cm-1, 2867cm-1), (3335cm-1, 2895cm-1) (3299cm-1, 2922cm-1 peanut shell and skin powder”
Meng 等 - 2020 - Effects of peanut shell and skin extracts on the a DOI: 10.1016/j.ijbiomac.2020.02.235 -
Alkyl C-H confidence 1.0
“While asymmetric and symmetric C-H stretching are attributed to the bands at 2895 and cm-1, 2927 respectively.”
An effective uranium removal using diversified synthesized cross-linked chitosan bis-aldehyde Schiff base derivatives from aqueous solutions DOI: 10.1007/s11356-022-23856-2 -
Hydroxyl (O-H) confidence 1.0
“3267 2887 1590 1406 1229 1009 , , and The absorption bands at 1367 3249cm-1 3600 3000 2400 1800 1200 600 in the FTIR spectra were due to O-H stretching (cm-1 2895cm-1 ) vibration of alcohol and phenol.”
Jemal 等 - 2017 - Synthesis, Characterization, and Evaluation of the DOI: 10.1155/2017/4213275 -
confidence 1.0
“de Carvalho Peaks at 2894.63 and 2919.7/cm is generally assigned to Mendes et al.”
Biofibres from biofuel industrial byproduct—Pongamia pinnata seed hull DOI: 10.1186/s40643-017-0144-x -
Alkyl C-H confidence 1.0
“The band at 2895 cm-1 corresponds to the elongation of the bond in CH, a”
Periquiteira (Cochlospermum orinocense): A Promising Amazon Fiber for Application in Composite Materials DOI: 10.3390/polym15092120 -
Carbohydrate confidence 1.0
“The peaks in the FTIR spectra of lignocellulosic biomass samples are assigned in The band intensity at 2895 cm-1 indicates a higher hemicellulose concentration, and CH2 and CH3 asymmetric and symmetric 2930 1.250 0.575 1.364 0.684 1.000 0.7”
Wozniak 等 - 2021 - Chemical and Structural Characterization of Maize DOI: 10.3390/ma14061527
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