What absorbs at 560 cm⁻¹ in an FTIR spectrum?
A band near 560 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 560 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 | 14 | 12 | 1.0 |
| Phosphate (PO4) | 11 | 9 | 1.0 |
| Silicon-oxygen (Si-O) | 6 | 6 | 1.0 |
| Silicon (Si) | 5 | 5 | 1.0 |
| Phosphorus | 5 | 4 | 1.0 |
| Siloxane (Si-O-Si) | 4 | 4 | 1.0 |
| Amide | 4 | 3 | 1.0 |
| Hydroxyl (O-H) | 4 | 3 | 1.0 |
| Methoxy (OCH3) | 2 | 2 | 1.0 |
| Methacrylate | 2 | 2 | 1.0 |
| C-O single bond | 2 | 2 | 1.0 |
| Acetate | 2 | 2 | 1.0 |
| Alkyl C-H | 2 | 2 | 1.0 |
| Ring structure | 2 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Lipid | 1 | 1 | 1.0 |
| S s | 1 | 1 | 1.0 |
| Metal hydroxyl | 1 | 1 | 1.0 |
| Carbonate | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Protein | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| N-O 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 |
|---|---|---|---|
| SnO2 | 560, 2800, 1547 | Metal oxygen | 1 |
| bone | 560, 1649, 1660 | Phosphate (PO4), 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 560 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 (Si) confidence 1.0
“cm-1, cm-1 broad band from 840-1240 and the peaks at 560 643 were due to asymmetric USC stretching vibration of Si-O-Si bond and stretching vibrations of Si-O-Si bridges.”
Mimosa pudica mediated praseodymium substituted calcium silicate nanostructures for white LED application DOI: 10.1016/j.jallcom.2016.08.064 -
confidence 1.0
“The remaining peaks at 560, 415, and 379 are assigned to Zn-O bond [30, 34].”
Structural and optical characteristics of Ti-doped ZnO nanorods deposited by simple chemical bath deposition DOI: 10.1007/s10854-017-6905-7 -
Phosphate (PO4) confidence 1.0
“The particle size effect on the absorbance of IR of the main v4 phosphate peaks at 560 and 600 Markers Figure and error bars as in 3.”
Kontopoulos 等 - 2018 - Preparation of bone powder for FTIR-ATR analysis DOI: 10.1016/j.vibspec.2018.09.004 -
Hydroxyl (O-H) confidence 1.0
“560cm-1[10-11], 3According to Figure 3, there are a Sn-OH vibration peak at NO vibration peaks at 1384cm-1 1637cm-1[12]”
Liu 等 - 2012 - Preparation and Properties of Gd and Sb Doped SnO2 DOI: 10.4028/www.scientific.net/AMR.528.50 -
Amide confidence 1.0
“intensities of the photoacoustic absorption bands of cm(cid:3)1) were divided by the the amide I (1650 The FTIR-PAS spectra were recorded by a Nicolet intensities of the phosphate bands (560, 600, and spectrometer, equipped with a MTEC Phot”
Oliveira 等 - 2017 - Chemical Interaction Analysis of an Adhesive Conta DOI: 10.2341/16-062-L -
Metal oxygen confidence 1.0
“FTIR spectra confirmed the formation of pristine and modified part of Springer Nature 2021 cm-1 SnO nanocrystals as bend at 560 attributed to Sn-O-Sn stretching 2 * vibrations.”
Structurally enriched aliovalent Cd2+-doped SnO2 nanocrystals and their physicochemical investigations DOI: 10.1007/s10854-021-06217-6 -
Metal oxygen confidence 1.0
“Ti-O stretching of the bond while the peaks around 560 are toward a higher wavenumber, i.e.”
Verma 等 - 2021 - Structural, morphological, and optical properties DOI: 10.1016/j.ceramint.2021.02.110 -
Water (H2O) confidence 1.0
“cm(cid:2)1, 43(cid:2) n »602 literature reported substantially high mean values of solubil3PO peaks at and 560 representing the forma- (7.82%-14.2%) hydroxyapatite6 water.10,11,16,17,40,41 ity when submerged in in both Cerafill and Endosequ”
Characterisation of the Bioactivity and the Solubility of a New Root Canal Sealer DOI: 10.1016/j.identj.2023.04.003
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