What absorbs at 564 cm⁻¹ in an FTIR spectrum?
A band near 564 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 564 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) | 7 | 6 | 1.0 |
| Silicon (Si) | 2 | 2 | 1.0 |
| C-O single bond | 2 | 2 | 1.0 |
| Metal oxygen | 2 | 2 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Methoxy (OCH3) | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| Chlorine | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Phosphorus | 1 | 1 | 1.0 |
| N h | 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 |
|---|---|---|---|
| SiO | 564, 800, 1745 | Silicon (Si), C-O single bond | 1 |
| silver nanoparticles | 564, 1636, 1631 | C-O single bond | 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 564 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
“and 564 cm-1 that correspond to the N-H, C-H, C=C CH 3, C-C, S=O, and C-Cl respectively Fig.”
Avilala 和 Golla - 2019 - ANTIBACTERIAL AND ANTIVIRAL PROPERTIES OF SILVER N DOI: 10.13040/IJPSR.0975-8232.10(3).1223-28 -
Phosphate (PO4) confidence 1.0
“The showed pronounced peaks at 564 and due to the splitting function was measured as the heights of the phosphate presence of the phosphate group (Wright and Schwarcz, 1996;”
Li 等 - 2023 - Fourier-transformed infrared spectroscopy study of DOI: 10.3389/feart.2022.1008139 -
Hydroxyl (O-H) confidence 1.0
“The recm(cid:1)1 lative high intensity of band at 564 may be due to the pre- -OH sence of surface adsorbed group [39].”
Shajira 等 - 2015 - Sunlight assisted photodegradation by tin oxide qu DOI: 10.1016/j.jpcs.2015.09.003 -
Alkyl C-H confidence 1.0
“Hence, we assign peak is not clearly visible in Figure 2 which lies behind Moreover, this CH out of plane bending does not come 552cm-1 552cm-1 564cm-1 .”
Ullah 等 - 2016 - Fourier Transform Infrared Spectroscopy of Bisphe DOI: 10.1155/2016/2073613 -
C-O single bond confidence 1.0
“LLM confirmed rule peak-group candidate”
Varma 和 Vasudevan - 2020 - Extraction, Characterization, and Antimicrobial Ac DOI: 10.1021/acsomega.0c01903 -
Silicon (Si) confidence 1.0
“However, the double band observed at 564 and 588 cm-1 for the OTS reference corresponds to the Si-Cl stretching mode, which”
A Hybrid Superhydrophobic/Hydrophilic Surface Based on SiO2 Nanoparticles over a Clay Substrate for Enhanced Dew Yield Potential DOI: 10.3390/app12031526 -
Phosphate (PO4) confidence 1.0
“Moreover, the bands that could be found at 564 and 602 cm-1 were due to the υ4 (triply degenerate) molecular vibration of the O-P-O bond and their presence in the FTIR spectra indicate that the hydroxyapatite is well structured [23,24,26,47”
Physicochemical Characterization of Europium-Doped Hydroxyapatite Thin Films with Antifungal Activity DOI: 10.3390/coatings12030306 -
Phosphate (PO4) confidence 1.0
“A low cm-1 cm-1 and the double bands at 564 and 604 belong to bending vibrations of P-O (υ intensity band at 469”
Esfahani 等 - 2016 - Structural and morphological analysis of zinc inco DOI: 10.1590/S1517-707620160003.0055
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