What absorbs at 896 cm⁻¹ in an FTIR spectrum?
A band near 896 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 896 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.
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| C-O single bond | 17 | 16 | 1.0 |
| Carbohydrate | 13 | 11 | 1.0 |
| Methoxy (OCH3) | 10 | 10 | 1.0 |
| Methacrylate | 10 | 10 | 1.0 |
| Acetate | 10 | 10 | 1.0 |
| Ring structure | 6 | 6 | 1.0 |
| Alkyl C-H | 5 | 5 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Chitosan | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 0.9 |
Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.
Possible materials
| Material | Supporting peaks | Overlapping groups | Cited sources |
|---|---|---|---|
| PMMA | 896, 1722, 1383 | Methacrylate, Methoxy (OCH3), C-O single bond | 1 |
| chitosan | 896, 1650, 1655 | Methacrylate, C-O single bond, Methoxy (OCH3) | 1 |
| SiO2 | 896, 1739, 699 | Methoxy (OCH3) | 1 |
| cellulose nanocrystals | 896, 1110, 1640 | Methacrylate, C-O single bond, Methoxy (OCH3) | 1 |
| PVC | 896, 834, 1195 | Methoxy (OCH3), Methacrylate, C-O single bond | 1 |
| chitin | 896, 1650, 1655 | Methacrylate, C-O single bond, Methoxy (OCH3) | 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 896 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.
Literature behind these assignments
-
Carbohydrate confidence 1.0
“cm-1, In the CNC spectrum, the peaks are present at 1429, 1315, 1035, and 896 representing typical In the CNC spectrum, the peaks are present at 1429, 1315, 1035, and 896 cm-1, representing cellulose absorption peaks.”
Isolation and Characterization of Cellulose Nanocrystals from Oil Palm Mesocarp Fiber DOI: 10.3390/polym9080355 -
Alkyl C-H confidence 1.0
“3 cm-1 in-phase ring-stretching mode), 1023 (C-O-C asymmetric in-phase ring-stretching), 1159cm-1 1114cm-1 and896cm-1 (CH wagging), (asymmetricbridgeoxygenstretching),”
Antimicrobial Activity of Chemically and Biologically Treated Chitosan Prepared from Black Soldier Fly (Hermetia illucens) Pupal Shell Waste DOI: 10.3390/microorganisms9122417 -
Carbohydrate confidence 1.0
“Meanwhile, the peak at 895.97 is characteristic of β-glycosidic linking glucose units in cellulose.”
Mahardiani 等 - 2022 - Nanofiber Fabrication from Palm Fiber Waste for Su DOI: 10.48317/IMIST.PRSM/morjchem-v10i2.32648 -
Acetate confidence 1.0
“The peak C-O stretch of about 1000-1100 from the cellulose group cm-1 and the C-O-C peak around 896 stretching cellulose β-glycosidic bonds similar to Cai et al.”
Martijanti 等 - 2020 - Investigation of characteristics of bamboo fiber f DOI: 10.1088/1757-899X/850/1/012028 -
Ring structure confidence 1.0
“LLM confirmed rule peak-group candidate”
Ramesh 和 Ang - 2010 - Impedance and FTIR studies on plasticized PMMA-LiN DOI: 10.1007/s11581-009-0417-2 -
Ring structure confidence 1.0
“The interaction between ions and 3 willleadtoanincreaseinthenumberoffreeplasticizers(whichdoesnotinteractwithLi+ SiO ions).Whenthesilicacontentincreasesfrom2%to 2 896cm-1 5%, the intensity of the peak at (due to the ring breathing vibration”
Ramesh 等 - 2007 - FTIR studies of PVCPMMA blend based polymer elect DOI: 10.1016/j.saa.2006.06.012 -
Acetate confidence 1.0
“A of crystalline cellulose is connected with "crystallinity peak", around 1420-1430 896 cm-1, is the absorbance of the peak at wavenumber 896 which is characteristic for C-O-C β-(1,4)-glycosidic stretching vibrations assigned to the amorpho”
FTIR Analysis of Changes in Chipboard Properties after Pretreatment with Pleurotus ostreatus (Jacq.) P. Kumm DOI: 10.3390/en15239101 -
Acetate confidence 1.0
“A band at 896 is attributed to as C-O-C cm-1 54,55.”
Bacterial nanocellulose from agro-industrial wastes: low-cost and enhanced production by Komagataeibacter saccharivorans MD1 DOI: 10.1038/s41598-020-60315-9
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