What absorbs at 519 cm⁻¹ in an FTIR spectrum?
A band near 519 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 519 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.
Mulige funktionelle gruppetildelinger
| Funktionel gruppe | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 3 | 3 | 1,0 |
| Silicon silicon | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Silanol (Si-OH) | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 0 | 1,0 |
| Alkene (C=C) | 1 | 0 | 1,0 |
| Hydrogen bond | 1 | 0 | 1,0 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
Possible materials
| Materiale | Understøttende toppe | Overlapping groups | Citerede kilder |
|---|---|---|---|
| bentonite | 519, 882, 918 | Hydroxyl (O-H), Silicon-oxygen (Si-O) | 1 |
| goethite | 519, 1470, 696 | Hydroxyl (O-H), Silicon-oxygen (Si-O) | 1 |
| magnetite | 519, 1740, 1263 | Hydroxyl (O-H), Silicon-oxygen (Si-O) | 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 519 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 bag disse tildelinger
-
Metal oxygen tillid 1,0
“It is important MO (M asymmetric stretching modes of group = Li, Co, Mn), to note that, use of two straight lines is sufficient to fit the 6 cm-1 whereas the low frequency bands at 519 are assigned conductivity in the whole testing temperat”
Gangadhar 等 - 2018 - Structural and Conductivity Studies of LiCo1-xMnxO DOI: 10.1080/0371750X.2018.1446847 -
Silicon-oxygen (Si-O) tillid 1,0
“(cm-1) ] FTIR bands, Entry Catalysts S�O Si-O Si-O bending Si-OH stretching Si-O-Si Si-OH 519 801”
Nazir 等 - 2020 - Green Synthesis Characterization and Thermotropic DOI: 10.1155/2020/3120657 -
tillid 1,0
“The peaks at 519, 625 and 695 corresponded to cm-1 bound sulphate and iron, as reported in [20].”
Surface Spectroscopy of Pyrite Obtained during Grinding and Its Magnetisation DOI: 10.3390/min12111444 -
tillid 1,0
“Cu2+ showed that the removal of by composite particles not cm-1 The absorption peak near 519 was the bending only included adsorption and chemical precipitation, but vibration absorption peak of Si-O bond, and the absorption also had the sy”
Xiao 等 - 2017 - Adsorption-Coagulation Mechanism of Composites in DOI: 10.15273/gree.2017.02.030 -
Silicon-oxygen (Si-O) tillid 0,8
“Si-O vibration in belite”
FTIR study on early age hydration of carbon nanotubes modified cement-based materials DOI: 10.1680/jadcr.16.00167
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