What absorbs at 3391 cm⁻¹ in an FTIR spectrum?
A band near 3391 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 6 cited sources
Brzi odgovor
A band near 3391 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.
Moguće dodjele funkcionalnih skupina
| Funkcionalna skupina | Potporni dokazi | Citirani izvori | Najveća pouzdanost |
|---|---|---|---|
| Hydroxyl (O-H) | 4 | 4 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
Rangiranje odražava akumulirane literaturne dokaze, a ne jedno autoritativno pravilo. Uvijek provjerite u kontekstu vašeg uzorka.
Mogući materijali
| Materijal | Potporni vrhovi | Preklapajuće skupine | Citirani izvori |
|---|---|---|---|
| SnO2 | 3391, 2800, 1547 | Hydroxyl (O-H) | 1 |
Materijali su prikazani samo kada ista literatura podržava ovu traku i barem jedan dodatni karakteristični vrh.
Logika spektra
This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 3391 cm⁻¹ is usually not enough for material identification by itself.
Upotreba u stvarnom svijetu
Ova vrsta upita uobičajena je u identifikaciji polimera, probiru nepoznate plastike, rješavanju problema u kontroli kvalitete, provjeri recikliranog materijala i pregledu dodjele vrhova potkrijepljenom literaturom.
Uobičajene pogreške
- Tretiranje jedne izolirane vrpce kao dokaza materijala bez provjere barem jednog ili dva podržavajuća pika.
- Zanemarivanje preklapanja: više funkcionalnih skupina može doprinositi u blizini istog valnog broja.
- Preskakanje validacije kada aditivi, mješavine, oksidacija ili kontaminacija mogu izobličiti spektar.
Savjet za provjeru
Kada nejasnoća ostane, validirajte hipotezu pomoću DSC, GC-MS ili TGA, posebno za mješavine, degradirane uzorke i punjene polimere.
Literatura iza ovih dodjela
-
Hydroxyl (O-H) pouzdanost 1,0
“2 cm-1, cm-1 SnO nanoparticles show transmittance peaks at 3391 and 1568 which are associated to the 2 cm-1, vibration of stretching OH, while peaks at a wave number of 625, 930, and 1635 indicating the appearance of the stretching mode of”
Diantoro 等 - 2018 - Control of Dielectric Constant and Anti-Bacterial DOI: 10.1088/1757-899X/367/1/012012 -
Carboxyl (COOH) pouzdanost 1,0
“(6 h without toluene), which displayed a hydroxyl peak absorption, but without the unsaturation removal, and the synthetic reaction with formic acid that presented a peak elongation in the hydroxyl (3391 cm-1) and unsaturation loss (3009 cm”
Montenegro 等 - 2023 - Enzymatic and Synthetic Routes of Castor Oil Epoxi DOI: 10.3390/polym15112477 -
N h pouzdanost 1,0
“1200 900 These peaks are assigned cm-1, Polypyrrole exhibit characteristic peaks at 3391 to NH stretching vibration (ν-NH 2), CH stretching cm-1, cm-1, cm-1, cm-1, cm-1 1536 1444 1297 1041 784”
Moosvi 等 - 2016 - Studying the electrical, thermal, and photocatalyt DOI: 10.1590/1980-5373-MR-2015-0786 -
Hydroxyl (O-H) pouzdanost 1,0
“3300-3400 -OH stretch ± ± 3391 26.1 0.3 3266 9.3 0.1 ± ± 2920 12.8 0.1 2921 9.1 0.1 -CH 2asymmetric stretch”
Grape Canes (Vitis vinifera L.) Applications on Packaging and Particleboard Industry: New Bioadhesive Based on Grape Extracts and Citric Acid DOI: 10.3390/polym14061137 -
Hydroxyl (O-H) pouzdanost 0,9
“Peak at 3391 cm-1 corresponds to -OH stretch.”
Arla 等 - 2018 - CHARACTERIZATION AND QUANTIFICATION OF ETHYLHEXYLG DOI: 10.13040/IJPSR.0975-8232.9(4).1660-65 -
Hydroxyl (O-H) pouzdanost 0,8
“Absorption at 3391 cm-1 attributed to OH groups.”
Li 等 - 2020 - Solvent-free synthesis of 1-amidoalkyl-2-naphthol DOI: 10.2478/pjct-2020-0012
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