What absorbs at 1649 cm⁻¹ in an FTIR spectrum?
A band near 1649 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 |
|---|---|---|---|
| Carbonyl (C=O) | 6 | 6 | 0,9 |
| Amide | 5 | 4 | 0,95 |
| Protein alpha helix | 1 | 1 | 0,9 |
| Protein beta sheet | 1 | 1 | 0,9 |
| C-O single bond | 1 | 1 | 0,9 |
| Water (H2O) | 1 | 1 | 0,9 |
| Hydroxyl (O-H) | 1 | 1 | 0,9 |
| Silicon-oxygen (Si-O) | 1 | 1 | 0,9 |
| N h | 1 | 1 | 0,9 |
| Aromatic ring | 1 | 1 | 0,8 |
| Alkene (C=C) | 1 | 1 | 0,7 |
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
-
Amide confiance 0,95
“Explicit assignment: 'characteristic amide I band at 1649'”
Rashid 等 - 2019 - Excipient Interactions in Glucagon Dry Powder Inha DOI: 10.3390/pharmaceutics11050207 -
Carbonyl (C=O) confiance 0,9
“Explicit assignment”
Muthomimah 等 - 2020 - Effect of sonication frequency in synthesis of sil DOI: 10.1088/1757-899X/833/1/012077 -
confiance 0,9
“Sorption band at 1649 represents C-NH and O groups on N-CQDs.”
Aladesuyi 和 Oluwafemi - 2023 - Synthesis of glutamine-based green emitting carbon DOI: 10.1016/j.heliyon.2023.e15904 -
Carbonyl (C=O) confiance 0,9
“Text states 'absorption at 1649.3 corresponds to C=O'.”
Chen 等 - 2023 - Silver nanoparticles deposited on a cotton fabric DOI: 10.1039/d3ra00989k -
Silicon-oxygen (Si-O) confiance 0,9
“Explicit assignment in text: '1649 (Si-O stretching)'”
Daraie 等 - 2021 - Investigation of halloysite nanotubes and Schiff b DOI: 10.1038/s41598-021-02991-9 -
confiance 0,9
“Peak at 1649 cm-1 assigned to amide I protein.”
Elsheikha 等 - 2020 - Impact of Neospora caninum Infection on the Bioene DOI: 10.3390/pathogens9090710 -
confiance 0,9
“Text: 'bands observed at 1649 and 1460 were attributed to asymmetric and symmetric stretching'”
Heidarieh 等 - 2014 - Preparation and anatomical distribution study of G DOI: 10.2478/nuka-2014-0019 -
Amide confiance 0,9
“Explicit assignment: 'amide I & II bands at 1649 and 1545'”
Jeon 等 - 2014 - Oxidative Gelation of Dopamine-modified Polyaspart DOI: 10.7317/pk.2014.38.1.108
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