What absorbs at 568 cm⁻¹ in an FTIR spectrum?
A band near 568 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 568 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.
Возможные назначения функциональных групп
| Функциональная группа | Подтверждающие факты | Цитируемые источники | Максимальная достоверность |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 4 | 4 | 1,0 |
| Metal oxygen | 3 | 3 | 1,0 |
| Silicon (Si) | 2 | 2 | 1,0 |
| Phosphate (PO4) | 2 | 2 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
Ранжирование отражает накопленные литературные данные, а не единственное авторитетное правило. Всегда проверяйте в контексте вашего образца.
Possible materials
| Материал | Поддерживающие пики | Overlapping groups | Цитируемые источники |
|---|---|---|---|
| hematite | 568, 1030, 469 | Silicon-oxygen (Si-O), Silicon (Si), Phosphate (PO4) | 1 |
| kaolinite | 568, 3696, 693 | Silicon-oxygen (Si-O), Silicon (Si), Metal oxygen | 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 568 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.
Литература, лежащая в основе этих назначений
-
Water (H2O) достоверность 1,0
“Molecular water would leave the HA crystal absorption band for molecular water onto the O-H peak at 3,568cm-1 structure through the termination sites of the c-axes channels at (Figure 10) possibly resulted in a misinterpretation 100°C.”
Li 等 - 2023 - Fourier-transformed infrared spectroscopy study of DOI: 10.3389/feart.2022.1008139 -
достоверность 1,0
“These two bands were the result of a split in the of the bulk Fe 3O 1 4 at 568 cm-1 corresponded to the υ(Fe-O) lattice stretching vibration of magnetite (Fe 3O 4) cm-1,”
Mesoporous Magnetic Cysteine Functionalized Chitosan Nanocomposite for Selective Uranyl Ions Sorption: Experimental, Structural Characterization, and Mechanistic Studies DOI: 10.3390/polym14132568 -
Silicon-oxygen (Si-O) достоверность 1,0
“For sand, no weight 302 loss was observed and only one endothermic peak, at 568°C, associated with the allotropic a b 303 transformation of quartz into quartz , was observed.”
Cousture 等 - 2021 - Study of a binder based on alkaline activated lime DOI: 10.1016/j.conbuildmat.2007.10.015 -
Metal oxygen достоверность 1,0
“The bands at 568 and 533 correspond to the vibration of cm-1 cm-1 = V-O [44].”
Transition Metal Oxodiperoxo Complex Modified Metal-Organic Frameworks as Catalysts for the Selective Oxidation of Cyclohexane DOI: 10.3390/ma13040829 -
Silicon-oxygen (Si-O) достоверность 1,0
“The band at 568 and vibration of lazurite and O-Si-O symmetric stretching vibration of wollastonite [61].”
Ma 等 - 2019 - Investigation of the Optical, Physical, and Chemic DOI: 10.3390/su11143803 -
достоверность 1,0
“New peak assignable to Pd-N.”
Nasaruddin 等 - 2022 - Synthesis, Structural Characterization, Hirshfeld DOI: 10.1021/acsomega.2c04688 -
Phosphate (PO4) достоверность 1,0
“from respective PO groups at 1069 and 1081 cm-1 43- (ν ν ν From the O-P-O bending mode PO at 568 cm-1) (for PO and Si-O-Si) [50-52,71], 452, 465 and 43434 3 as (ν ν ν and P-O stretching modes 961 cm-1 PO at 963 cm-1, PO (for PO 43-) [50,51,”
Radev 等 - 2009 - OrganicInorganic bioactive materials Part II in DOI: 10.2478/s11532-009-0076-1 -
Silicon (Si) достоверность 1,0
“described that the peaks centered at From literature data, the bands at 568, 600, 960, 1043 cm-1 455 are associated with the presence of ν Si-O-Ca ν ν ν 43-, 43cm-1 and 1008 correspond to PO PO and 4 1”
Radev 等 - 2010 - OrganicInorganic bioactive materials Part IV In DOI: 10.2478/s11532-009-0142-8
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