What absorbs at 555 cm⁻¹ in an FTIR spectrum?
A band near 555 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 555 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 |
|---|---|---|---|
| Metal oxygen | 7 | 7 | 1.0 |
| Hydroxyl (O-H) | 3 | 3 | 1.0 |
| Silanol (Si-OH) | 3 | 3 | 1.0 |
| Silicon (Si) | 2 | 2 | 1.0 |
| Urethane | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 1.0 |
| N-O bond | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| C c single bond | 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 |
|---|---|---|---|
| CeO2 | 555, 1554, 1630 | Hydroxyl (O-H), Metal oxygen | 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 555 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
“cm-1 due to respectively in PVDF-BFO composite by interacting with BFO bands at 410 8 ACCEPTED MANUSCRIPT cm-1 bending of Fe-O and Bi-O groups and 555 due to Fe-O and Bi-O stretching of BiO and 6 cm-1 FeO octahedra [40].”
Enhanced dielectric and ferroelectric properties of PVDF-BiFeO3 composites in 0–3 connectivity DOI: 10.1016/j.jallcom.2017.04.310 -
Silanol (Si-OH) confidence 1.0
“theflints fined Silanol is even more susceptible All were then removed from beneath thesoil and allowed silanol absorption at 555 tochangesduetoheatingthantheSi\\O\\Sibondnetworkswhichabto cool down to room temperature.”
Goder-Goldberger 等 - 2017 - Heating of flint artifacts from the site of Boker DOI: 10.1016/j.jasrep.2017.01.041 -
Metal oxygen confidence 1.0
“LLM confirmed rule peak-group candidate”
Hassanien 等 - 2019 - Novel green route to synthesize cadmium oxide@grap DOI: 10.1088/2053-1591/ab23ac -
confidence 1.0
“Explicitly assigned to hydrogen-related bonds.”
Miyazaki 等 - 2005 - Properties of radio-frequency-sputter-deposited Ga DOI: 10.1063/1.1888027g -
Metal oxygen confidence 1.0
“LLM confirmed rule peak-group candidate”
Naik-Samant 和 Furtado - 2021 - Biomineralization of Fe3+ to Nanosized gamma Fe2O3 DOI: 10.1080/01490451.2021.1954730 -
C c single bond confidence 1.0
“The weaker 555.41cm-1 C-C corresponds to stretch in the band at [39] alkenes group.”
Ramkumar 等 - 2022 - Larvicidal potential of Cipadessa baccifera leaf e DOI: 10.1515/gps-2022-0071 -
Metal oxygen confidence 1.0
“5(a) represents the XPS spectrum 2 cm-1 The strong IR band located at 555 is due to the metal-oxygen for corelevelpeaks forC 1s,O 1s, andCe3delectrons.”
An efficient chemical sensor based on CeO2 nanoparticles for the detection of acetylacetone chemical DOI: 10.1016/j.jelechem.2020.114089 -
Metal oxygen confidence 1.0
“4 1,8 (4,000-400cm-1), gated region all obtained spectra have 555cm-1 664Cm-1 ʋ ʋ two absorption bands 1, at and 2 1,6 band metal-oxygen assigned from stretching vibration of the [3-21].”
Abdelhak 等 - 2019 - Characterization of Mn-Doped Co3O4 Thin Films Prep DOI: 10.1515/htmp-2017-0185
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