What absorbs at 1643 cm⁻¹ in an FTIR spectrum?
A band near 1643 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
Mulige funktionelle gruppetildelinger
| Funktionel gruppe | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| Carbonyl (C=O) | 5 | 5 | 0,9 |
| Hydroxyl (O-H) | 4 | 4 | 0,9 |
| Alkene (C=C) | 2 | 2 | 1,0 |
| N h | 1 | 1 | 0,9 |
| Water (H2O) | 1 | 1 | 0,9 |
| Amide | 1 | 1 | 0,8 |
| Protein | 1 | 1 | 0,8 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
Litteratur bag disse tildelinger
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Alkene (C=C) tillid 1,0
“cm-1 peak at 1705.1 means that there is a bond of cm-1 -C=O, and also absorption at 1643.4 and medium intensity which shows the presence of C=C.”
Aritonang 等 - 2019 - Grafting of Oleic Acid On Cyclic Natural Rubber Re DOI: 10.13005/ojc/350119 -
Carbonyl (C=O) tillid 0,9
“Text: 'vibrational band at 1643 (C=O stretching) attributed to communic acid'”
Garcia-Valles 等 - 2023 - Differentiation between copal and amber by their s DOI: 10.1007/s10973-023-12333-8 -
tillid 0,9
“Explicit assignment in text”
Jibrael 和 Mohammed - 2016 - Production of graphene powder by electrochemical e DOI: 10.1016/j.ijleo.2016.04.101 -
Water (H2O) tillid 0,9
“Bending vibration of H-O-H group.”
Ahmed 等 - 2023 - Immobilization Approach as a Creative Strategy to DOI: 10.3390/polym15071797 -
Carbonyl (C=O) tillid 0,9
“Small peak near 1643.22 cm-1 due to C=O stretching.”
Amin 等 - 2019 - Characterization and performance analysis of compo DOI: 10.1016/j.heliyon.2019.e02009 -
Carbonyl (C=O) tillid 0,9
“C=O stretching”
Araujo 等 - 2021 - Comparison of Different Methods for Spongin-like C DOI: 10.3390/membranes11070522 -
Alkene (C=C) tillid 0,9
“Explicit assignment in text: 'alkenes (-C=C-) at 1643'”
Armynah 等 - 2016 - Study of Chloride Ion Transport of Composite by Us DOI: 10.1063/1.4943752 -
Hydroxyl (O-H) tillid 0,9
“explicit assignment”
Barzic 等 - 2022 - Cellulose derivativebarium titanate composites wi DOI: 10.21203/rs.3.rs-467926/v1
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