What absorbs at 575 cm⁻¹ in an FTIR spectrum?
A band near 575 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 575 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 | 6 | 6 | 1.0 |
| Methacrylate | 2 | 2 | 1.0 |
| Ketone | 2 | 2 | 1.0 |
| Ester | 2 | 2 | 1.0 |
| Carboxyl (COOH) | 2 | 2 | 1.0 |
| Carbonyl (C=O) | 2 | 2 | 1.0 |
| Amide | 2 | 2 | 1.0 |
| Acetate | 2 | 2 | 1.0 |
| Phosphate (PO4) | 2 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Carbon dioxide | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 0.5 |
| C-S single bond | 1 | 0 | 1.0 |
| Carbonate | 1 | 0 | 1.0 |
| Phosphorus | 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 |
|---|---|---|---|
| ZnO | 575, 1400, 3430 | Metal oxygen, Methacrylate | 2 |
| Fe3O4 | 575, 2358, 1673 | Metal oxygen, Methacrylate | 1 |
| soil | 575, 1240, 2910 | Methacrylate | 1 |
| silver nanoparticles | 575, 1636, 1631 | Methacrylate | 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 575 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
“The peak 575 cm-1 of the A1 (LO) phonon modes may be due to the vacancy of the interstitial O or Zn or their complex [41].”
Effects of Nd doping on structural, optical, morphological and surface-chemical state analysis of ZnO nanoparticles for antimicrobial and anticancer activities DOI: 10.1016/j.surfin.2021.101000 -
Carbon dioxide confidence 1.0
“The high temperature peak (575 K) shows relatively high Co2+ intensity, good stability and responds to γ-doses.”
Pushpa 和 Kokila - 2017 - Effect of cobalt doping on structural, thermo and DOI: 10.1016/j.jlumin.2017.05.032 -
confidence 1.0
“The PEG-SPIONs and LyP-1-SPIONs 4 cm-1 prepared all have the characteristic peak at 575 and 581 caused by Fe-O-Fe stretching vibration.”
LyP-1-conjugated Fe3O4 nanoparticles suppress tumor growth by magnetic induction hyperthermia DOI: 10.1080/09205063.2017.1409048 -
Metal oxygen confidence 1.0
“The characteristic metal oxide cm-1 stretching peaks of BaM occurs at 575 and 437 .”
Zainuri 和 Amalia - 2017 - The Microstructure Analysis of Barium MHexaferri DOI: 10.1088/1757-899X/196/1/012015 -
Acetate confidence 1.0
“(Figure4).ThereasoncouldbethattheTritonx-100couldbeused In the larger wavenumber bands in the range of studied samples, a band that appeared in the range of as a carbon source by native bacteria and promotes the growth of 1785-1,575cm-1 was”
Anwar-ul-Haq 等 - 2022 - Role of Bacterial Consortium and Synthetic Surfact DOI: 10.3389/fenrg.2022.874492 -
Aromatic ring confidence 1.0
“the band at 575 vibration of the benzoquinone High-resolution core-level N 1s X-ray to the deformation vibration of a benzenoid ring bonded to a photoelectron (XPS) spectra of the bases and of 2,5cm-1 CO”
Blaha 等 - 2019 - Role of p-Benzoquinone in the Synthesis of a Condu DOI: 10.1021/acsomega.9b00542 -
confidence 1.0
“Cu-Ag 1470 and the peaks at 575, 621 and 674 belongs to To determine the chemical composition of MOF/MCMa June Cu-O.65,66 under the stretching vibrations of the Also, the broad band 41 composite and the chemical state of its elements, XPS w”
Monometallic and bimetallic Cu–Ag MOF/MCM-41 composites: structural characterization and catalytic activity DOI: 10.1039/c9ra03310f -
Alkyl C-H confidence 1.0
“However, bands at 2,929 2,918cm-1 C-H might be assigned to vibrations of and 1,575cm-1 corresalkanes.”
Iqbal 等 - 2020 - Green synthesis of silver nanoparticles from Valer DOI: 10.1515/gps-2020-0066
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