What absorbs at 902 cm⁻¹ in an FTIR spectrum?
A band near 902 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 902 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.
Möjliga identifieringar av funktionella grupper
| Funktionell grupp | Stödjande fakta | Citerade källor | Högsta förtroende |
|---|---|---|---|
| Phosphate (PO4) | 3 | 3 | 1,0 |
| C-O single bond | 3 | 3 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Oxygen heterocycle | 2 | 2 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 0,7 |
Rankingen speglar ackumulerade litteraturbevis, inte en enda auktoritativ regel. Bekräfta alltid mot din provkontext.
Possible materials
| Material | Stödjande toppar | Overlapping groups | Citerade källor |
|---|---|---|---|
| SiO | 902, 800, 1745 | 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 902 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.
Litteratur bakom dessa identifieringar
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förtroende 1,0
“FTIR spectra hydrophobic state resulted from surface treatment involving of Hybrid Al 2O 3-SiO shows additional peak at 902, 850, 2 cm-1”
Damayanti - 2010 - Preparation of superhydrophobic PET fabric from Al DOI: 10.1007/s10971-010-2271-0 -
Oxygen heterocycle förtroende 1,0
“ALG rapidly decomposed into monomers and evenstretching of the epoxy ring at 902 and seen in this study”
Hussin 等 - 2020 - Taguchi design-assisted immobilization of Candida DOI: 10.1016/j.enzmictec.2019.109506 -
Phosphate (PO4) förtroende 1,0
“Symmetric vibrations and asymmetric stretching modes of non-bridging or P-O”
Effects of titanium nanoparticles on self-cleaning and structural features of zinc-magnesium-phosphate glass DOI: 10.1016/j.materresbull.2015.11.022 -
Acetate förtroende 1,0
“Polymers2022,14,3100 4of14 Polymers 2022, 14, x FOR PEER REVIEW 4 of 14 presence of the epoxy group is displayed by the characteristic absorption bands at 902 and cm-1, 853 which areattributed to stretching of C-O-C and C-O of oxirane group”
Synthesis Characterization and Highly Protective Efficiency of Tetraglycidyloxy Pentanal Epoxy Prepolymer as a Potential Corrosion Inhibitor for Mild Steel in 1 M HCl Medium DOI: 10.3390/polym14153100 -
Carbohydrate förtroende 1,0
“Finally, at 902 it presents a peak that is associated with the absorption of β-glycosidic the bonds between glucose units in cellulose [36-40].”
Improvement in the Carbonation Resistance of Construction Mortar with Cane Bagasse Fiber Added DOI: 10.3390/ma14082066 -
Phosphate (PO4) förtroende 1,0
“(2:1) sample at 298 cm-1, (2:1) sample at 1266 and 902 cm-1, corresponding to the P=O bond and P-O bond from P=O 1266 and 902 corresponding to the bond and P-O bond from polyphosphoric acid produced 299 polyphosphoric acid produced by the d”
Synthesis of a Carrageenan–Iron Complex and Its Effect on Flame Retardancy and Smoke Suppression for Waterborne Epoxy DOI: 10.3390/polym11101677 -
Acetate förtroende 1,0
“Regarding the fingerprint area, the peaks at 1022 and 902 cm-1 were mainly associated with C-O and P-O stretching Polymers2019,11,947 5of13”
Degradation of Metal-Organic Framework Materials as Controlled-Release Fertilizers in Crop Fields DOI: 10.3390/polym11060947 -
Phosphate (PO4) förtroende 1,0
“The IR band at 902 is assigned to the asymmetric bridging P-O bond H”
Zhang 等 - 2010 - Leaving Group Activation and Pyrophosphate Ionic S DOI: 10.1021/ja107806j.
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