What absorbs at 893 cm⁻¹ in an FTIR spectrum?
A band near 893 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 893 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 |
|---|---|---|---|
| Carbohydrate | 3 | 3 | 1.0 |
| Alkyl C-H | 3 | 3 | 1.0 |
| C-O single bond | 2 | 2 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Methoxy (OCH3) | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| Aromatic ring | 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 | 893, 1650, 1655 | Alkyl C-H, Amide, C-O single bond | 1 |
| Cellulose | 893, 1735, 1650 | Alkyl C-H, C-O single bond, Carbohydrate | 1 |
| silk fibroin | 893, 1050, 1511 | Amide, Alkyl C-H | 1 |
| chitin | 893, 1650, 1655 | Amide, Alkyl C-H, C-O single bond | 1 |
| cellulose acetate | 893, 1650, 1741 | Alkyl C-H, C-O single bond | 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 893 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
“Furthermore, the most significant and best 893cm-1, defined absorption band, that at corroborated the near total absence of crystalline cellulose Ⅰ[12].”
Wu 和 Zuo - 2011 - Research on Structure and Property of Silk Fibroin DOI: 10.4028/www.scientific.net/AMR.175-176.176 -
Aromatic ring confidence 1.0
“The band around 3292 is mainly 1373, 1243 and 1036 cm-1 are attributed to the characteristic vibrational modes of the pyranose ring related to stretching bands of the hydroxyl groups, -OH, of the carboxylic acids, amino acids, alcohols [39]”
Preparation and Physicochemical Characterization of Softgels Cross-Linked with Cactus Mucilage Extracted from Cladodes of Opuntia Ficus-Indica DOI: 10.3390/molecules24142531 -
Alkyl C-H confidence 1.0
“The absorption bands at 1430 ('crystallinity band', assigned cm-1 to a symmetric CH bending vibration) and 893 ('amorphous band', associated with C-O-C stretching 2 at β-(1→4)-glycosidic linkages) can be used to study the type of crystallin”
Carrion-Prieto 等 - 2019 - CRYSTALLINITY OF CELLULOSE MICROFIBERS DERIVED FRO DOI: 10.4067/S0718-221X2019005000402 -
Alkyl C-H confidence 1.0
“observed at 1058, 1023, and 992 In addition, the weight of the chitin content has been previously reported to cm-1 band at 893 was attributed to the C-H out-of-plane Periplaneta americana be 18% in [23], 36.6% in cicada vibration.”
Characteristics of cricket (Gryllus bimaculatus) chitosan and chitosan-based nanoparticles DOI: 10.1007/s10068-018-0314-4 -
C-O single bond confidence 1.0
“Bands at 812 cm-1 and 893 cm-1 may be Separations2023,10,103 8of18 related to the presence of αand β-glycosidic bonds [49].”
Extraction, Characterization, and Antioxidant Activity of Polysaccharides from Ajwa Seed and Flesh DOI: 10.3390/separations10020103 -
Alkyl C-H confidence 1.0
“Element Element content, wt.% Method HBI LOI TCI - - - 1 1 1 3336/1336 cm 1430/893 cm 1371/2900 cm Elemental analysis C 47.70 FTIR 1.16 0.89 1.33 H 5.15 N 3.37 for deformation vibrations of C-H and O-H bonds were 3 Results and discussion cm”
Hejna 等 - 2017 - Performance properties of rigid polyurethane-polyi DOI: 10.1515/epoly-2017-0012 -
Carbohydrate confidence 1.0
“In the case of the LOI index, the peak of 1430 cm-1 corresponds to the cm-1 to the presence of crystalline cellulose I, while the peak of 893 reflects the prespresence of crystalline cellulose I, while the peak of 893 cm-1 reflects the pres”
Cellulose in Secondary Xylem of Cactaceae: Crystalline Composition and Anatomical Distribution DOI: 10.3390/polym14224840 -
Carbonyl (C=O) confidence 1.0
“O'Connor al.15 able to measure spectra with high signal-to-noise ratios which potassium bromide pellet FTIR techniques, et first "crystallinity index" spectrum.25 leads to a high-intensity infrared developed the for cellulose I, where An in”
Kinetic Analysis of Cellulose Acetate/Cellulose II Hybrid Fiber Formation by Alkaline Hydrolysis DOI: 10.1021/acsomega.9b00159
Have a spectrum with this band?
Upload your FTIR spectrum and get a full interpretation report — peak assignments with literature citations, library matches, and a literature-backed analysis — in seconds.