What absorbs at 1657 cm⁻¹ in an FTIR spectrum?
A band near 1657 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 |
|---|---|---|---|
| Amide | 6 | 4 | 0,9 |
| Carbonyl (C=O) | 3 | 1 | 0,9 |
| Protein random coil | 2 | 2 | 0,9 |
| Carboxyl (COOH) | 1 | 1 | 0,9 |
| Alkene (C=C) | 1 | 1 | 0,9 |
| Protein alpha helix | 1 | 1 | 0,9 |
| Water (H2O) | 1 | 1 | 0,8 |
| Protein | 1 | 0 | 0,9 |
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
-
Protein alpha helix confiance 0,9
“Second derivative spectrum shows band at ~1657 cm-1 mainly due to alpha-helix and random-coil structures.”
Berterame 等 - 2016 - Protein aggregation and membrane lipid modificatio DOI: 10.1186/s12934-016-0438-2 -
Alkene (C=C) confiance 0,9
“Explicit assignment from text.”
Harwansh 和 Deshmukh - 2021 - Formulation and Evaluation of Sodium Alginate and DOI: 10.5530/ijper.55.3.145 -
confiance 0,9
“Explicit assignment: 'disordered structures (bands at 1648 and 1657 cm-1)'”
Hurtado-Gomez 等 - 2006 - Biophysical characterization of the enzyme I of th DOI: 10.1529/biophysj.105.076935 -
Amide confiance 0,9
“Associated with amide I”
Jose Beriain 等 - 2022 - Tenderness of PGI Ternera de Navarra Beef Sample DOI: 10.3390/foods11213426 -
Carbonyl (C=O) confiance 0,9
“nonbonded and H-bonded C=O stretching”
Rogulska 等 - 2013 - New thermoplastic poly(thiourethane-urethane) elas DOI: 10.1007/s10973-013-3007-5 -
Amide confiance 0,9
“Range 1595-1720 cm-1 explicitly assigned to amide I.”
Ryou 等 - 2011 - Contributions of microstructure and chemical compo DOI: 10.1007/s10856-011-4293-8. -
Amide confiance 0,9
“Text: 'amide I band at 1657'”
Service 等 - 2011 - Participation of Glutamate-354 of the CP43 Polypep DOI: 10.1021/bi1015937. -
Carboxyl (COOH) confiance 0,9
“Assigned to stretching vibration of -C=O in -COO-.”
Wang 等 - 2020 - Study on the structure activity relationship of th DOI: 10.1515/htmp-2020-0034
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