What absorbs at 563 cm⁻¹ in an FTIR spectrum?
A band near 563 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 563 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 |
|---|---|---|---|
| Phosphate (PO4) | 6 | 5 | 1.0 |
| Metal oxygen | 4 | 4 | 1.0 |
| Amide | 3 | 3 | 1.0 |
| Carboxyl (COOH) | 2 | 2 | 1.0 |
| N h | 2 | 2 | 1.0 |
| Fluorine (C-F) | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| Borate | 1 | 1 | 1.0 |
| C-O single bond | 1 | 1 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Phosphorus | 1 | 1 | 1.0 |
| Silicate | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 0.5 |
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 |
|---|---|---|---|
| cotton fabric | 563, 900, 862 | Amide | 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 563 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
-
Metal oxygen confidence 1.0
“Explicit assignment in text: 'absorption bands at low wavenumbers (563 and 446 cm-1), can be assigned to the stretching vibration of metal'”
Preparation and characterization of doubly substituted microwave absorbing material by sol-gel technique for super high frequency applications DOI: 10.1016/j.pnsc.2017.11.001 -
Silicate confidence 1.0
“Peak present at 483 and 946cm-1 563cm-1 vibrational mode is present at in Ca2Y2Si2O9 silicate in Ca2Y2Si2O9 and Sr2Y2Si2O9 phosphor is due to the SiO4”
Down-conversion characteristics of Eu3+ doped M2Y2Si2O9 (M = Ba, Ca, Mg and Sr) nanomaterials for innovative solar panels DOI: 10.1016/j.pnsc.2019.07.003 -
Phosphate (PO4) confidence 1.0
“Phosphate bands are observed at 563 599 961 cm-1”
Toibah 等 - 2012 - FTIR Study on Phase Behavior of Magnesium-doped Bi DOI: 10.1063/1.4732476 -
Metal oxygen confidence 1.0
“The absorption peaks, observed at 511 and 820 and 465 attributed to the stretching, bending and cm-1 m-Cu-O 563 corresponds to the vibration mode of rocking mode of the Si-O-Si group, respectively [29, 30].”
Tripathy 等 - 2017 - Investigation of surface and interface properties DOI: 10.1007/s10854-016-5846-x -
Phosphate (PO4) confidence 1.0
“LLM confirmed rule peak-group candidate”
Synthesis and characterization of nano bioactive glass for improving enamel remineralization ability of casein phosphopeptide–amorphous calcium phosphate (CPP-ACP) DOI: 10.1186/s12903-022-02549-9 -
C-O single bond confidence 1.0
“516 C-O-C glycosidic linkage vibration 563 In-plane vibration rocking vibration 713 CH 2”
Cuiffo 等 - 2021 - Thermochemical degradation of cotton fabric under DOI: 10.1186/s40691-021-00263-8 -
Phosphate (PO4) confidence 1.0
“The bending modes of the P-O bonds in phosphate groups are responsible for the double peak at 563 and 742 cm-1.”
Synthesis and Characterization of New Composite Materials Based on Magnesium Phosphate Cement for Fluoride Retention DOI: 10.3390/ma16020718 -
Borate confidence 1.0
“cm-1 band positioned nearly at 714 refers to the bending of B-O-B in trigonal BO units and the last band at 3 cm-1 563 points to the vibration of metal cations like ZnO.”
Structural, optical, and cytotoxicity studies of laser irradiated ZnO doped borate bioactive glasses DOI: 10.1038/s41598-023-34458-4
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