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
Aseiniadau grŵp swyddogaethol posibl
| Grŵp swyddogaethol | Ffeithiau ategol | Ffynonellau a ddyfynnwyd | Hyder uchaf |
|---|---|---|---|
| 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 |
Mae＇r safle＇n adlewyrchu tystiolaeth llenyddiaeth gronnwyd, nid rheol awdurdodol sengl. Cadarnhewch bob amser yn erbyn eich cyd-destun sampl.
Llenyddiaeth y tu ôl i＇r aseiniadau hyn
-
Protein alpha helix hyder 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) hyder 0.9
“Explicit assignment from text.”
Harwansh 和 Deshmukh - 2021 - Formulation and Evaluation of Sodium Alginate and DOI: 10.5530/ijper.55.3.145 -
hyder 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 hyder 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) hyder 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 hyder 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 hyder 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) hyder 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
Oes gennych sbectrwm gyda＇r band hwn?
Llwythwch eich sbectrwm FTIR i fyny a chael adroddiad dehongli llawn — aseiniadau brig gyda chyfeiriadau llenyddiaeth, cyfateb llyfrgell, a chadwyn dystiolaeth â gradd hyder — mewn eiliadau.
Dehongli fy sbectrwm