What absorbs at 3074 cm⁻¹ in an FTIR spectrum?
A band near 3074 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 5 cited sources
Brzi odgovor
A band near 3074 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 |
|---|---|---|---|
| Alkyl C-H | 2 | 2 | 1,0 |
| Aromatic ring | 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 |
| Amide | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 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 |
|---|---|---|---|
| collagen | 3074, 1408, 1660 | Methacrylate, Alkyl C-H, Methoxy (OCH3) | 1 |
| PLA | 3074, 1650, 1073 | Alkyl C-H, Methacrylate, Methoxy (OCH3) | 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 3074 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
“A peak at cm-1 3074 belonged to weak O-H stretching [30] and cm-1 a broad peak at 3322 was attributed to O-H”
Influence of Ho3+ substitution on structural and magnetic properties of Mg–Mn ferrites DOI: 10.1007/s10854-021-05547-9 -
Alkyl C-H pouzdanost 1,0
“ized by Raman spectroscopy studies should be considered as 2 3 cm-1 suggesting the presence of water), 3074 (C-H stretching), 3 distinct survival strategy against osmotic stressful conditions b cm-1 cm-1 2955 (asymmetric stretching vibratio”
Cojoc 等 - 2019 - Carotenoids produced by halophilic bacterial strai DOI: 10.1093/femsle/fnz243 -
Amide pouzdanost 1,0
“LLM confirmed rule peak-group candidate”
Dolete 等 - 2019 - Development and sequential analysis of a collagen- DOI: 10.25083/rbl/24.1/108.117 -
Acetate pouzdanost 1,0
“Neat unsaturated 1276.64cm-1 hasapeakat3074.41cm-1 in lignin.The peak at can be assigned to C-O-C resultingfromthe=C-H polyester”
Sahari 和 Maleque - 2016 - Mechanical Properties of Oil Palm Shell Composites DOI: 10.1155/2016/7457506 -
Aromatic ring pouzdanost 1,0
“The characteristic bands of alkenes and aromatic compounds are 3074 cm-1, 1630 cm-1, 910 cm-1, cm-1, cm-1, cm-1, The characteristic bands of alkenes and aromatic compounds are 3074 1630 910 3033 cm-1, 1496 cm-1, and 698 cm-1.”
Degradation Classification of 3D Printing Thermoplastics Using Fourier Transform Infrared Spectroscopy and Artificial Neural Networks DOI: 10.3390/app8081224
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