What absorbs at 895 cm⁻¹ in an FTIR spectrum?
A band near 895 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 895 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 | 20 | 19 | 1.0 |
| Methacrylate | 15 | 15 | 1.0 |
| Acetate | 15 | 15 | 1.0 |
| Alkyl C-H | 14 | 14 | 1.0 |
| Methoxy (OCH3) | 14 | 14 | 1.0 |
| Carbohydrate | 13 | 11 | 1.0 |
| Ring structure | 4 | 4 | 1.0 |
| Hydroxyl (O-H) | 4 | 4 | 1.0 |
| Carbonyl (C=O) | 2 | 2 | 1.0 |
| C c single bond | 2 | 2 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
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 |
|---|---|---|---|
| chitosan | 895, 1650, 1655 | Alkyl C-H, Acetate, Methacrylate | 1 |
| Cellulose | 895, 1735, 1650 | Alkyl C-H, Acetate, Methacrylate | 1 |
| polysaccharide | 895, 1637, 1320 | Methacrylate, Acetate, 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 895 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
-
Ring structure confidence 1.0
“In general, chitosan powder show characteristic peaks at 3425.58 cm-1 cm-1 cm-1 (-OH and -NH stretching), 2877.79 (-CH stretching), 1651.07 (amide I/C=O stretching), 2 cm-1 cm-1 cm-1 1597.06 (amide II/-NH bending), 1072.42 (C-O-C stretching”
Cahyono 等 - 2018 - Characteristics of eugenol loaded chitosan-tripoly DOI: 10.1088/1757-899X/349/1/012010 -
Acetate confidence 1.0
“Also detected are the peaks at 1315 and 895 cm-1 which corresponds to C-O symmetric stretching and C-H deformation respectively.”
Indarti 等 - 2019 - Silylation of TEMPO oxidized nanocellulose from oi DOI: 10.1016/j.ijbiomac.2019.05.161 -
confidence 1.0
“The absorption peak 1102 and 1022 attributed to C-O stretching and peak at 895 cm-1 cm-1 was due to N-H rocking band.”
Jaiswal 和 Dhayal - 2020 - Preparation of 2D coatings of functionally graded DOI: 10.1016/j.matchemphys.2020.122663 -
Acetate confidence 1.0
“The strong absorption at is attributed 895cm(cid:2)1 C-O O-H b-glycoto and stretching [46], while the weak band at is due to the”
Alkali and epoxy-silane surface modified pine cone flour reinforced polypropylene/poly (lactic acid) DOI: 10.1080/01694243.2021.1952677 -
Alkyl C-H confidence 1.0
“Whereas the band around 895 pericarp changes after each treatment are as displayed cm-1 was attributed to the glycosidic C-H rock vibration in Figures 1 and 2.”
Khorairi 等 - 2020 - Cellulose Powder from Piper nigrum L. Agro-Industr DOI: 10.17576/jsm-2020-4908-17 -
C-O single bond confidence 1.0
“Peak at 895 was 6 cm-1 assigned to the β-glycosidic linkage while peak around 1032-1022 was assigned to C-O stretch of cellulose [25].”
Kuthi 和 Badri - 2014 - Effect of Cooking Temperature on the Crystallinity DOI: 10.1063/1.4895240 -
C-O single bond confidence 1.0
“LLM confirmed rule peak-group candidate”
Lu 等 - 2020 - One-pot Green Synthesis of Carboxylated Cellulose DOI: 10.1016/j.biortech.2007.04.029 -
Hydroxyl (O-H) confidence 1.0
“2a at 3340, 2924, 1636, anomeric group stretching of polysaccharides has been found cm-1 inthepeakat895cm-1[18].Thechangeintheintensityofthe O-H 1038, 942, and 895 in pure TSP are ascribed to C-O Li+ stretching, CH peaks and shift in freque”
Premalatha 等 - 2017 - Tamarind seed polysaccharide (TSP)-based Li-ion co DOI: 10.1007/s11581-017-1989-x
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