What absorbs at 3081 cm⁻¹ in an FTIR spectrum?
A band near 3081 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 3081 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 | 7 | 7 | 1,0 |
| Aromatic ring | 3 | 3 | 1,0 |
| Alkene (C=C) | 2 | 2 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Styrene | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
Rangiranje odražava akumulirane literaturne dokaze, a ne jedno autoritativno pravilo. Uvijek provjerite u kontekstu vašeg uzorka.
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 3081 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
-
Alkyl C-H pouzdanost 1,0
“LLM confirmed rule peak-group candidate”
60MeV Ni ion induced modifications in nano-CdS/polystyrene composite films DOI: 10.1016/j.radphyschem.2013.06.022 -
Alkyl C-H pouzdanost 1,0
“cm-1 ν(CH) 3090-2850 that correspond to alkane modes, with peaks at 3081, 3060, 3028, cm-1.”
Czylkowska 等 - 2021 - Cytotoxic Activity against A549 Human Lung Cancer DOI: 10.3390/ijms22136692 -
Alkyl C-H pouzdanost 1,0
“Assignment C-H aromatic ring C-H stretching 3081,3060,3027 ν methyl 2962 (CH 3), C-H asymmetric stretching asym ν methylene (CH 2), C-H asymmetric stretching 2927”
Filip 等 - 2013 - Investigation of thermal and catalytic degradation DOI: 10.2478/s11532-013-0202-y -
Alkene (C=C) pouzdanost 1,0
“At the same time, the peak present in the 3081 in the PPI spectra may be due to cm-1 the presence of =C-H stretching vibration from the alkene functional group.”
Kasar 和 Ahmaruzzaman - 2022 - Characterization of liquid products obtained from DOI: 10.1038/s41598-022-15371-8 -
Alkyl C-H pouzdanost 1,0
“In cm-1, cm-1 In the curve of the AllylEHO, new peaks are observed at 3081 1646 and the curve of the AllylEHO, new peaks are observed at 3081 cm-1, 1646 cm-1 and 926 cm-1 cm-1 926 representative of the C-H aliphatic stretch of the character”
Preparation of Bis[(3-ethyl-3-methoxyoxetane)propyl]diphenylsilane and Investigation of Its Cationic UV-Curing Material Properties DOI: 10.3390/polym13152573 -
Aromatic ring pouzdanost 1,0
“f cm-1 reaction (Table 2, entry 2) was performed without a solvent, -C-H FTIR: 3081.43 for aromatic stretching, 2983.48 cm-1 without cashew shell extract, and with microwave irradiation -C-H for aliphatic stretching, 1654.06 and 1621.27”
Manjare 等 - 2023 - Microwave-Assisted Rapid and Green Synthesis of Sc DOI: 10.1021/acsomega.2c05187 -
Alkene (C=C) pouzdanost 1,0
“stretching wave numbers appear in the range of 3000-3100 Accordingly, in cm-1 the present study, the aromatic =C-H stretching gives bands at 3081 in the”
Growth, crystal structure, Hirshfeld surface and vibrational properties of a new supramolecular hybrid material: (C4H7N2)2TeBr6 DOI: 10.1007/s00289-021-04053-6 -
pouzdanost 1,0
“The 1480 cm-1 3 (symmetric NH bend), the 906 cm-1 (NH 3+/CH rock) and the 3081 cm-1 (N-H stretch) 3+ 3”
Characterization of a New Low Temperature Encapsulation Method with Ethylene-Vinyl Acetate under UV Irradiation for Perovskite Solar Cells DOI: 10.3390/app12105228
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