What absorbs at 3331 cm⁻¹ in an FTIR spectrum?
A band near 3331 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
Brzi odgovor
A band near 3331 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) | 8 | 8 | 1,0 |
| Hydrogen bond | 3 | 2 | 1,0 |
| N h | 2 | 2 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Carbohydrate | 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 |
|---|---|---|---|
| TiO2 | 3331, 1700, 1093 | Metal oxygen, Hydroxyl (O-H) | 1 |
| polyurethanes | 3331, 1740, 1728 | N h | 1 |
| TiO | 3331, 1730, 1699 | Hydroxyl (O-H), Metal oxygen | 1 |
| polysaccharide | 3331, 1637, 1320 | Hydroxyl (O-H), N h | 1 |
| polyurethane | 3331, 2270, 1700 | N h | 1 |
| TiO2 nanoparticles | 3331, 1700, 455 | Hydroxyl (O-H), Metal oxygen, N 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 3331 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
-
Carbohydrate pouzdanost 1,0
“Strong absorption was observed at 3279.62, 3272.35 glucose and galactose and xylose with different concentracm-1 corresponding to the hydroxyl vibration and 3331.21 tion which is dependent on many factors.”
Evaluation of the effect of soluble polysaccharides of palm kernel cake as a potential prebiotic on the growth of probiotics DOI: 10.1007/s13205-018-1362-4 -
Hydroxyl (O-H) pouzdanost 1,0
“Interestengly, there was a strong absorption with a wide and strong band centred cm-1 at 3331 (O-H stretch) only observed in the untreated sample.”
Firsoni 等 - 2019 - Fiber Content and Relative Feed Value Estimation o DOI: 10.1088/1757-899X/546/4/042008 -
Hydroxyl (O-H) pouzdanost 1,0
“cm-1 showed a decrease in the initial compounds and endings, especially at the 3331 peaks of the Delfín-Narciso,D.;Díaz,F.Impactof Geotrichum candidum O-H bonds.”
Impact of Dragon Fruit Waste in Microbial Fuel Cells to Generate Friendly Electric Energy DOI: 10.3390/su15097316 -
Acetate pouzdanost 1,0
“assigned to the asymmetrical stretching of C-O-C groups and cm-1 The PU spectrum shows a strong absorption at 3331 cm-1 the C-O stretching vibrations at 1109 of the urethane arising from H-bonded N-H.”
Gabriela Echeverria 等 - 2015 - PolyurethanePoly(2-(Diethyl Amino)Ethyl Methacryl DOI: 10.1590/0104-1428.1716 -
N h pouzdanost 1,0
“Explicit assignment in text: '3449 and 3331 (N-H stretch)'”
Supramolecular Interactions Induce Unexpectedly Strong Emissions from Triphenylamine-Functionalized Polytyrosine Blended with Poly(4-vinylpyridine) DOI: 10.3390/polym9100503 -
Metal oxygen pouzdanost 1,0
“In TiO 2-DHBAOA, the bands at the FTIR spectrum of TiO cm-1, assigned to the stretching vibra3331 and 3233 tions of aldehyde phenolic -OH groups, and bands cm-1, corresponding to the bending at 1389 and 1192”
Radoman 等 - 2015 - Effect of surface modified TiO2 nanoparticles on t DOI: 10.3144/expresspolymlett.2015.83 -
Hydroxyl (O-H) pouzdanost 1,0
“making it possible to observe the most intense peak at 3331 belonging to cm-1 substances such as carvings or leaves of any kind of fruit or vegetable are used as fuel, the the O-H bonds, while the peak at 2969 and 2805 belongs to the alkane”
Potential Use of Coriander Waste as Fuel for the Generation of Electric Power DOI: 10.3390/su15020896 -
Hydroxyl (O-H) pouzdanost 1,0
“LLM confirmed rule peak-group candidate”
Salman 等 - 2020 - In Vitro Antimicrobial and Antioxidant Activities DOI: 10.3390/molecules25204685
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