What absorbs at 1640 cm⁻¹ in an FTIR spectrum?
A band near 1640 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
Möjliga identifieringar av funktionella grupper
| Funktionell grupp | Stödjande fakta | Citerade källor | Högsta förtroende |
|---|---|---|---|
| Amide | 29 | 27 | 1,0 |
| Water (H2O) | 27 | 22 | 1,0 |
| Hydroxyl (O-H) | 24 | 21 | 1,0 |
| Alkene (C=C) | 15 | 14 | 1,0 |
| Carbonyl (C=O) | 12 | 11 | 1,0 |
| Protein beta sheet | 6 | 5 | 0,9 |
| C=n | 4 | 4 | 1,0 |
| N h | 3 | 3 | 1,0 |
| Carboxyl (COOH) | 3 | 3 | 0,95 |
| Protein | 2 | 2 | 0,9 |
| Protein random coil | 1 | 1 | 1,0 |
| Protein alpha helix | 1 | 1 | 0,95 |
| Alkyl C-H | 1 | 1 | 0,9 |
| Aromatic ring | 1 | 1 | 0,8 |
| Silanol (Si-OH) | 1 | 1 | 0,7 |
| N eq o | 1 | 1 | 0,7 |
| N n bond | 1 | 1 | 0,7 |
| C-O single bond | 1 | 1 | 0,6 |
| Acetate | 1 | 0 | 0,9 |
Rankingen speglar ackumulerade litteraturbevis, inte en enda auktoritativ regel. Bekräfta alltid mot din provkontext.
Litteratur bakom dessa identifieringar
-
Water (H2O) förtroende 1,0
“peak at ~1640 cm-1 related to absorbed water”
Filipova 等 - 2018 - Synthesis of Nanofibrillated Cellulose by Combined DOI: 10.3390/nano8090640 -
Water (H2O) förtroende 1,0
“Explicitly attributed to H-O-H bending vibrations.”
Navaf 等 - 2021 - Talipot palm (Corypha umbraculifera L.) a nonconve DOI: 10.1016/j.ijbiomac.2021.04.035 -
Alkene (C=C) förtroende 1,0
“Explicit assignment: 'nonsaturated double bond absorb peaks were appeared at 1640'”
Shi 等 - 2006 - The investigation of argon plasma surface modifica DOI: 10.1016/j.eurpolymj.2006.01.007 -
Water (H2O) förtroende 1,0
“Stretching vibration mode of adsorbed water molecules on the surface of ferrite.”
Anchieta 等 - 2014 - Effects of Solvent Diols on the Synthesis of ZnFe2 DOI: 10.3390/ma7096281 -
förtroende 1,0
“Explicit assignment: low-frequency bending mode peak around 1640 1/cm wavenumbers.”
Atkinson 等 - 2023 - Microfabrication Process Development for a Polymer DOI: 10.3390/s23146251 -
Amide förtroende 1,0
“Explicit assignment: amide-I (~1640 cm-1)”
Brogna 等 - 2020 - Spectral fingerprinting to evaluate effects of sto DOI: 10.1038/s41598-020-78306-1 -
Hydroxyl (O-H) förtroende 1,0
“Explicit assignment in text.”
Catauro 和 Pacifico - 2017 - Synthesis of Bioactive Chlorogenic Acid-Silica Hyb DOI: 10.3390/ma10070840 -
Carbonyl (C=O) förtroende 1,0
“Assigned to Amide I (C=O stretching, N-H bending, water).”
Consumi 等 - 2020 - Non-Destructive Monitoring of P. fluorescens and S DOI: 10.3390/coatings10100930
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