What absorbs at 2897 cm⁻¹ in an FTIR spectrum?
A band near 2897 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
Quick answer
A band near 2897 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.
可能的官能团归属
| 官能团 | 支持性事实 | 引用来源 | 最高置信度 |
|---|---|---|---|
| Alkyl C-H | 16 | 15 | 1.0 |
| Hydroxyl (O-H) | 5 | 4 | 1.0 |
| Carbonate | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Methoxy (OCH3) | 1 | 1 | 0.9 |
排名反映了累积的文献证据，而非单一的权威规则。请始终对照您的样品背景进行确认。
Possible materials
| 材料 | 支持峰 | Overlapping groups | 引用来源 |
|---|---|---|---|
| Chitosan | 2897, 1650, 1655 | Alkyl C-H, Hydroxyl (O-H) | 1 |
| Cellulose | 2897, 1735, 1650 | Alkyl C-H, Hydroxyl (O-H), Carbohydrate | 1 |
| nanotubes | 2897, 1735, 1630 | Alkyl C-H, Hydroxyl (O-H) | 1 |
Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.
Spectrum logic
This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 2897 cm⁻¹ is usually not enough for material identification by itself.
Real-world usage
This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.
Common mistakes
- Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
- Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
- Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.
Verification advice
When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.
这些分配背后的文献
-
Alkyl C-H 置信度 1.0
“LLM confirmed rule peak-group candidate”
Mahardiani 等 - 2022 - Nanofiber Fabrication from Palm Fiber Waste for Su DOI: 10.48317/IMIST.PRSM/morjchem-v10i2.32648 -
Alkyl C-H 置信度 1.0
“(TiO2) in a round bottom vector present titanium oxide Stretching of the C-H group of synthesized jute cotton vessel.Then,thedewaxedjutefiberswereplacedintheround 2897cm-1 fibers occurred at while the original cotton fibers bottom vessel.”
Rahman 等 - 2015 - Synthesis of Cotton from Tossa Jute Fiber and Comp DOI: 10.1155/2015/470928 -
Alkyl C-H 置信度 1.0
“Peak at 2897.29 cm-1 attributed to C-H stretching vibrations.”
Characterization of cellulose extracted from oil palm empty fruit bunch DOI: 10.1063/1.4931295 -
Alkyl C-H 置信度 1.0
“Transmittance 75 -OH stretching 3400.83 3411.83 3417.98 C-H vibration 2897.18 2924.18 2926.11”
Effect of microwave assisted alkali pretreatment and other pretreatment methods on some properties of bamboo fibre reinforced cement composites DOI: 10.1016/j.conbuildmat.2020.118405 -
Hydroxyl (O-H) 置信度 1.0
“The copolymer P407 is a surfacteristic peaks of HPMC are at (OH stretching) and 2897cm(cid:3)1 1375cm(cid:3)1 tant which is widely used to improve the aqueous solubility of (CH stretching), (asymmetric CH bending 3 1049cm(cid:3)1 (CAO poorl”
Al-Ani 等 - 2019 - The effect of the source and the concentration of DOI: 10.1016/j.jsps.2019.04.012 -
Alkyl C-H 置信度 1.0
“The two broad peaks at 2897 and 2819 cm-1 could be assigned to C-H stretch vibration.”
Basheer 等 - 2020 - Synthesis, Characterization, and Analysis of Hybri DOI: 10.3390/polym12061305 -
Alkyl C-H 置信度 1.0
“cm-1, • The aliphatic C-H stretching was registered at 2956 and 2897 respectively, in the • The aliphatic C-H stretching was registered at 2956 cm-1 and 2897 cm-1, respectively, in the (CA/PEG/CHI-Ag polymeric membrane without chitosan-silv”
Caprarescu 等 - 2020 - Biopolymeric Membrane Enriched with Chitosan and S DOI: 10.3390/polym12081792 -
Alkyl C-H 置信度 1.0
“2897 2849 C-H symmetrical stretching from CH from aliphatic chain 2 1393”
Spectroscopic Characterization of Emulsions Generated with a New Laser-Assisted Device DOI: 10.3390/molecules25071729
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