What absorbs at 806 cm⁻¹ in an FTIR spectrum?
A band near 806 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 806 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 |
|---|---|---|---|
| C-O single bond | 2 | 2 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1,0 |
| Metal oxygen | 2 | 2 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Borate | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Metalloid oxygen | 1 | 1 | 0,8 |
| Carboxyl (COOH) | 1 | 1 | 0,7 |
| Hydrogen bond | 1 | 0 | 1,0 |
| Alkyl C-H | 1 | 0 | 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 |
|---|---|---|---|
| CuO | 806, 453, 1000 | Metal oxygen, C-O single bond | 1 |
| TiO | 806, 1730, 1699 | Metal oxygen, C-O single bond | 1 |
| kaolinite | 806, 3696, 693 | Silicon-oxygen (Si-O), Metal oxygen | 1 |
| DNA | 806, 1712, 1660 | 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 806 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
-
Metal oxygen достоверность 1,0
“1(b)) shows strong bands at 806 and 328 due to Nb-O”
Dwivedi 等 - 2014 - Down-shifting and upconversion photoluminescence i DOI: 10.1039/c4dt01864h -
достоверность 1,0
“Indeed, an IR band observed at 806 cm-1 is assigned to the Al-O bending mode of [AlO 6] octahedra [20-21].”
Souissi 等 - 2022 - Synthesis, Thermal Properties and Electrical Condu DOI: 10.21203/rs.3.rs-1294285/v1 -
N h достоверность 1,0
“Moreover, it is worth mentioning that F8815 has only primary amino groups as proved by the pair of peaks at 806 and 776 cm-1 cm-1 (NH bending, inset) [36], and the relative strong band at 1639 (NH stretching).”
Bellido-Aguilar 等 - 2019 - Effect of a fluoroalkyl-functional curing agent on DOI: 10.1016/j.surfcoat.2019.02.006 -
Ring structure достоверность 1,0
“3 899 J Mater Sci: Mater Electron (2023) 34:899 Page 5 of 15 Generally, the boroxol ring in the borate glass network is usually attributed to the IR absorption Absorbance 806cm(cid:2)1.”
Effect of CuO doping on structural features, optical absorption and photoluminescence behavior of ZnO-based glasses DOI: 10.1007/s10854-023-10270-8 -
C-O single bond достоверность 1,0
“cm-1 (COC,CCO and CCH deformation OH, C-H ring and side group vibrations), 871 cm-1 cm-1 cm-1 (glucosidic bond), 709 and 659 (C-OH out-of-plane and stretching), 806 bending) (Mizi et al., 2012).”
Iordache 等 - 2018 - FT-IR ANALYSIS OF FUSARIUM OXYSPORUM GROWN MYCO-CO DOI: 10.24264/icams-2018.VIII.8 -
Hydroxyl (O-H) достоверность 1,0
“Other minor changes (shifting/intensity bending at 806 cm-1 cm-1 variation) were also observed in AST at 1362 (in plane OH bend), 1208 (C-O stretching), cm-1 1508 and 1448 (C-C stretching (in ring)) [24].”
Astragalin from Cassia alata Induces DNA Adducts in Vitro and Repairable DNA Damage in the Yeast Saccharomyces cerevisiae DOI: 10.3390/ijms13032846 -
Siloxane (Si-O-Si) достоверность 1,0
“styreneSi-O-Si), Si-CH However, the analysis suggests that the material could be 3), 1101 (asymmetric stretching of 1068 (asymmetric Si-O-Si), Si-O-Si), stretching of 806 (symmetric stretching of 678 butadienerubber(SBR)becausesignalsofsuch”
Non-invasive identification of plastic materials in museum collections with portable FTIR reflectance spectroscopy: Reference database and practical applications DOI: 10.1016/j.microc.2015.07.016 -
C c single bond достоверность 1,0
“Band (cm-1) 806, 812, 813 806 C-C deformation and stretching vibration in mannans [45] - 827-831”
Study of Interactions between Titanium Dioxide Coating and Wood Cell Wall Ultrastructure DOI: 10.3390/nano12152678
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