What absorbs at 565 cm⁻¹ in an FTIR spectrum?
A band near 565 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 565 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 | 6 | 1.0 |
| Metal oxygen | 2 | 2 | 1.0 |
| Carbohydrate | 2 | 2 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 0.9 |
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 |
|---|---|---|---|
| wood | 565, 1740, 1730 | Carbohydrate | 1 |
| Hydroxyapatite | 565, 1620, 1639 | Phosphate (PO4) | 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 565 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
“Furthermore, the characteristic 4 cm-1 peak at 565 is indicated by Fe-O, which confirms the presence of Fe 3O [32].”
Rukman 等 - 2019 - GO-Fe3O4 Nanocomposite from coconut shell Synthes DOI: 10.1088/1755-1315/217/1/012008 -
Phosphate (PO4) confidence 1.0
“473 cm -1 and the O-P-O bending mode peaks at 565 cm and 602 cm One O-H water 1643cm-1, bending vibration mode, with a wavelength of was detected in the FTIR spectrum [14].”
Alshemary 等 - 2023 - Microstructure analysis and thermal stability of M DOI: 10.15251/DJNB.2023.181.1 -
N h confidence 1.0
“The bands in this interval can be cm-1, BSA exhibits the band at 565 which is almost undetectassigned to the NH out-of-plane bending, CN torsion, or”
Brandt 等 - 2015 - Effect of thermal denaturation, inhibition, and cl DOI: 10.1117/1.JBO.20.5.051015 -
Carbohydrate confidence 1.0
“the characteristic bands of Ti-O were observed at 770-500 and 565 The band of cellulose the characteristic bands of Ti-O were observed at 770-500 cm-1 and 565 cm-1.”
Enhanced Anti-Mold Property and Mechanism Description of Ag/TiO2 Wood-Based Nanocomposites Formation by Ultrasound- and Vacuum-Impregnation DOI: 10.3390/nano10040682 -
Phosphate (PO4) confidence 1.0
“565cm-1 260∘ ), and O-P-O bands (603, ) with C, whereas the PPVA The pure PVA film is stable up to 190∘”
Mohamed Saat 和 Johan - 2014 - The surface structure and thermal properties of no DOI: 10.1155/2014/439839 -
confidence 1.0
“This fact is in agreement with The shoulder band at 565 could be ascribed to 43Khan et al.”
Radev 等 - 2013 - In vitro bioactivity of Polyurethane85S Bioglass DOI: 10.2478/s11532-013-0273-9 -
Silicon-oxygen (Si-O) confidence 1.0
“Heat treatment atmosphere: H 2 cm-1 temperature and peaks at 565 attributed to quartz and its shape changes with the increasing corresponding to Fe 2SiO 4 become stronger, indicating that the crystal structure of temperature, indicating tha”
Wang 等 - 2021 - Melting Characteristics of Coal Ash and Properties DOI: 10.1021/acsomega.1c01949 -
Phosphate (PO4) confidence 0.9
“Text mentions PO peaks at 565 cm-1.”
Lebon 等 - 2008 - Characterization of archaeological burnt bones co DOI: 10.1007/s00216-008-2469-y
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