What absorbs at 840 cm⁻¹ in an FTIR spectrum?
A band near 840 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
Attributions possibles de groupes fonctionnels
| Groupe fonctionnel | Faits à l＇appui | Sources citées | Confiance maximale |
|---|---|---|---|
| Alkyl C-H | 3 | 2 | 0,9 |
| Nitrate | 2 | 2 | 0,9 |
| Silicon carbon | 2 | 2 | 0,9 |
| Hydroxyl (O-H) | 1 | 1 | 0,9 |
| Silicon (Si) | 1 | 1 | 0,8 |
| Aromatic ring | 1 | 1 | 0,8 |
| Methyl | 1 | 1 | 0,8 |
| Phosphate (PO4) | 1 | 1 | 0,7 |
| Borate | 1 | 1 | 0,6 |
| Carbonate | 1 | 0 | 0,8 |
| Siloxane (Si-O-Si) | 1 | 0 | 0,8 |
Le classement reflète les preuves bibliographiques accumulées, et non une règle faisant autorité. Confirmez toujours dans le contexte de votre échantillon.
Bibliographie derrière ces attributions
-
confiance 1,0
“β-phase PVDF signature band at 840 cm-1”
Harstad 等 - 2017 - Enhancement of beta-phase in PVDF films embedded w DOI: 10.1063/1.4973596 -
confiance 1,0
“B3N3 group stretching vibration”
Wei 等 - 2016 - Synthesis and Characterization of a Novel Borazine DOI: 10.3390/molecules21060801 -
confiance 0,95
“Text states 'distinctive peaks situated at 840 and 1275 cm-1 β-phase'.”
Torres-Rodriguez 等 - 2022 - Polyvinylidene Fluoride Aerogels with Tailorable C DOI: 10.3390/gels8110727 -
Silicon carbon confiance 0,9
“Explicitly stated: 'rocking vibrations of Si-C bond give rise to 840cm-1 peaks around 857 and [28]'.”
Mhaisagar 等 - 2014 - Mechanical properties of surface modified silica l DOI: 10.1016/j.mee.2013.10.006 -
confiance 0,9
“Text: 'absorption bands at 763 and 840cm-1 ... of a and b phase'”
Mohammadi 等 - 2007 - Effect of tensile strain rate and elongation on cr DOI: 10.1016/j.polymertesting.2006.08.003 -
Silicon carbon confiance 0,9
“Text: 'signals appearing as shoulders near 840 were related to the stretching vibrations of the Si-C'”
Cok 等 - 2023 - The Methyl Functionality of Monolithic Silica Xero DOI: 10.3390/gels9010033 -
Hydroxyl (O-H) confiance 0,9
“Appeared at 840 cm-1.”
Hou 等 - 2021 - Selectively Producing Acetic Acid via Boric Acid-C DOI: 10.3390/catal11040494 -
confiance 0,9
“Assigned to stretching mode for LiPF6.”
Pekarek 等 - 2020 - Intrinsic chemical reactivity of solid-electrolyte DOI: 10.1039/c9ta13535a
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