What absorbs at 2898 cm⁻¹ in an FTIR spectrum?
A band near 2898 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 2898 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.
Mulige funktionelle gruppetildelinger
| Funktionel gruppe | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| Alkyl C-H | 8 | 8 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
Possible materials
| Materiale | Understøttende toppe | Overlapping groups | Citerede kilder |
|---|---|---|---|
| cellulose | 2898, 1735, 1650 | Alkyl C-H, Hydroxyl (O-H), Methoxy (OCH3) | 3 |
| TiO | 2898, 1730, 1699 | Alkyl C-H, Hydroxyl (O-H), Methoxy (OCH3) | 1 |
| SiO | 2898, 800, 1745 | Hydroxyl (O-H), Methoxy (OCH3) | 1 |
| saliva | 2898, 1648, 1664 | Alkyl C-H, Methoxy (OCH3) | 1 |
| cellulose nanocrystals | 2898, 1110, 1640 | Methoxy (OCH3), Alkyl C-H, Hydroxyl (O-H) | 1 |
| MCM-41 | 2898, 2170, 1655 | Hydroxyl (O-H), Alkyl C-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 2898 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.
Litteratur bag disse tildelinger
-
Alkyl C-H tillid 1,0
“CH symmetric stretch Lipids 2902 3 cm-1 CH symmetric stretch Lipids 2898 3 cm-1”
Salivary ATR-FTIR Spectroscopy Coupled with Support Vector Machine Classification for Screening of Type 2 Diabetes Mellitus DOI: 10.3390/diagnostics13081396 -
Carbohydrate tillid 1,0
“The IR crystallinity index was measured using an infrared absorption ratio of A 1368(C-Hbending)/A 2898(C-Hstretching), as proposed by Nelson and cm-1 O'Connor [55], since the band at 1372 is assigned to crystalline structure of cellulose,”
Cosma 等 - 2023 - Modification of Cotton and Leather Surfaces Using DOI: 10.3390/ma16041397 -
Acetate tillid 1,0
“The band at 897 and for control and historical 2899.88cm-1 2898.20cm-1 for the control sample, and at for the samples respectively belongs to C-O-C, C-C-O, and C-C-H”
Investigate the role of fungal communities associated with a historical manuscript from the 17th century in biodegradation DOI: 10.1038/s41529-022-00296-4 -
Alkyl C-H tillid 1,0
“A reduction in relative intensity of band HCU/g, treated pulps, the same was recorded at = 18.48°, cm-1, at 2898 representing the C-H stretching vibration 18.52°, 18.62° and 18.42°, respectively.”
A study elucidating the relation between cellulose dissolution and crystallinity after cellulase treatment at different doses DOI: 10.1007/s13205-021-02920-7 -
Hydroxyl (O-H) tillid 1,0
“As depicted in Figure 2, the broad peak at 3338 cm-1 which appears in both spectra is attributed to the O-H frequency, whereas the peaks at 2898 and cm-1”
Razak 等 - 2014 - The Influence of Chemical Surface Modification of DOI: 10.3390/molecules19032957 -
Alkyl C-H tillid 1,0
“LLM confirmed rule peak-group candidate”
Zhu 等 - 2020 - Daylight-Active Cellulose Nanocrystals Containing DOI: 10.3390/ma13163547 -
Alkyl C-H tillid 0,9
“Band at 2898 cm-1 assigned to stretch CH”
Hydrothermal synthesis of bacterial cellulose–copper oxide nanocomposites and evaluation of their antimicrobial activity DOI: 10.1016/j.carbpol.2017.09.081 -
Alkyl C-H tillid 0,9
“assigned to stretching vibrations of -CH group”
Immobilization of Methyltrioxorhenium on Mesoporous Aluminosilicate Materials DOI: 10.3390/ma7042650
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