What absorbs at 886 cm⁻¹ in an FTIR spectrum?
A band near 886 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 886 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 | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Silicon hydride | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Possible materials
| Material | Supporting peaks | Overlapping groups | Cited sources |
|---|---|---|---|
| sodium alginate | 886, 1636, 1080 | Alkyl C-H, C-O single bond | 1 |
| PLA | 886, 1650, 1073 | 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 886 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
-
Silicon hydride confidence 1.0
“cm(cid:50)1 solution, three peaks appear at 807 immersing in Gravimetric porosity of as-etched porous silicon films was cm(cid:50)1 (cid:126)Si-O-Si mode(cid:33), (cid:126)Si-H asymmetric stretching 886 about 70%.”
Huang 和 Zhai - 1997 - Fourier transform infrared study of porous silicon DOI: 10.1116/1.589575 -
Aromatic ring confidence 1.0
“The benzene ring's =C-H bending vibration absorption peaks and benzene ring framework 886cm-1, 823cm-1 801cm-1.”
Li 等 - 2011 - The detection of Cypermethrin on the surface of Ap DOI: 10.4028/www.scientific.net/AMR.287-290.2991 -
Phosphate (PO4) confidence 1.0
“cm(cid:3)1 of montmorillonite is very low, this technique does not 850 to 1350 The bands around 886 are allow the identification of the main characteristic reflecassigned to the asymmetric vibration of the P O bond of 6.63(cid:1)21 cm(cid:3”
Martins 等 - 2022 - The influence of montmorillonite on the flame-reta DOI: 10.3390/POLYM12081701 -
C c single bond confidence 1.0
“cm-1 1461.73 confirms the V symmetry of the CH in 80 2 Lycopene cm-1 lycopene molecule, the vibrational peak at 885.61 60 indicate stretching of C-C-H and C-OH groups of lyco40”
Optimization of pectinase-assisted and tri-solvent-mediated extraction and recovery of lycopene from waste tomato peels DOI: 10.1007/s13205-017-0825-3 -
C-O single bond confidence 1.0
“Additionally, the characteristic ring stretching band of a β-1,4-glycosidic bond was observed at around 886 cm-1.”
Structural and Physical Properties of Alginate Pretreated by High-Pressure Homogenization DOI: 10.3390/polym15153225
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