What absorbs at 888 cm⁻¹ in an FTIR spectrum?
A band near 888 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 5 cited sources
Quick answer
A band near 888 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 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 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 0 | 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 | 888, 1650, 1655 | Methacrylate, C-O single bond, Methoxy (OCH3) | 1 |
| bacterial cellulose | 888, 1050, 1631 | Methoxy (OCH3), Methacrylate, C-O single bond | 1 |
| PVDF | 888, 1160, 840 | Methacrylate | 1 |
| PCL | 888, 1751, 1724 | Methacrylate, Methoxy (OCH3), 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 888 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
-
confidence 1.0
“Assigned to β-phase in text.”
Spectroscopic and thermal investigations of poly(vinylidene fluoride) films composites with LaNi3Co2 DOI: 10.1002/crat.200610789 -
Alkyl C-H confidence 1.0
“cm-1 cm-1 cm-1 and aliphatic C-H vibrations), 1646 (C = C aromatic), 1376 and 1450 cm-1 (CH and CH bending vibrations), 888, 835 (polyisoprene isomers), 758 and 698 3”
Lungulescu 和 Zaharescu - 2022 - Radiation Processing of Styrene-isoprene-styreneP DOI: 10.3390/polym14214737 -
Acetate confidence 1.0
“The FTIR absorption band at 888 cm-1 X1, which becomes more pronounced (more intense and in commercial cellulose, assigned to C-O-C stretch-”
Singh 等 - 2016 - Effect of carbon sources on physicochemical proper DOI: 10.1515/epoly-2016-0047 -
C c single bond confidence 1.0
“887.64 (C-C stretchcm-1”
Y 等 - 2020 - A Spatial Distribution Analysis on the Deposition DOI: 10.31661/jbpe.v0i0.1104. -
confidence 0.9
“Explicit assignment in text: 'peak at 888.07 indicated the presence of a chitosan ring'”
Physico-Mechanical Properties of Commercially Available Tissue Conditioner Modified with Synthesized Chitosan Oligosaccharide DOI: 10.3390/polym14061233
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