What absorbs at 2913 cm⁻¹ in an FTIR spectrum?
A band near 2913 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 2913 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 |
| Methyl | 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 |
|---|---|---|---|
| polyethylene | 2913, 1737, 1720 | Alkyl C-H | 1 |
| Nanoparticles | 2913, 1732, 1647 | Alkyl C-H | 1 |
| PVC | 2913, 834, 1195 | Alkyl C-H | 1 |
| PVDF | 2913, 1160, 840 | Alkyl C-H | 1 |
| polysaccharides | 2913, 1053, 1143 | Alkyl C-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 2913 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
“cm-1, of the C-H band is seen at 2913 At 1422 the stretching vibration of the C-H band can be noticed.”
Ramadan 和 Ismail - 2022 - Tunning the Physical Properties of PVDFPVCZinc F DOI: 10.21203/rs.3.rs-935328/v1 -
Alkyl C-H pouzdanost 1,0
“LLM confirmed rule peak-group candidate”
Nguyen 等 - 2022 - Effects of Ultraviolet Radiation on Recycled and V DOI: 10.21203/rs.3.rs-978155/v1 -
Alkyl C-H pouzdanost 1,0
“The band at 2913 can be attributed to C-H symmetric stretching.”
Influence of the Impregnation Technique on the Release of Esomeprazole from Various Bioaerogels DOI: 10.3390/polym13111882 -
Alkyl C-H pouzdanost 1,0
“2912.95cm-1 2848.35cm-1 the PEG and the peak at and of 2.06 - 2.60Å distance and one hydrophobic π interacrepresents the methyl and propyl group of HPMC tion with the polymer.”
Senthilvel 等 - 2019 - Development of Capsules Filled with Phenytoin and DOI: 10.5530/ijper.53.3.79 -
Alkyl C-H pouzdanost 1,0
“LLM confirmed rule peak-group candidate”
Construction of Novel Polymerizable Ionic Liquid Microemulsions and the In Situ Synthesis of Poly(Ionic Liquid) Adsorbents DOI: 10.3390/nano9030454 -
Alkyl C-H pouzdanost 0,95
“Explicit: 'C-H stretching vibration at ... 2913'.”
Preparation, Characterization of Propargyl Terminal Polybutadiene and Its Crosslinked Elastomers Properties DOI: 10.3390/polym12040748 -
pouzdanost 0,9
“Text: 'stretching vibrations appear at 2975 and 2913 cm-1'”
Aliyev 等 - 2020 - SI-ATRP Polymer-Functionalized Graphene Oxide for DOI: 10.1002/admi.202000443. -
pouzdanost 0,8
“Sorption peaks assigned to AKD.”
Hundhausen 等 - 2009 - Use of alkyl ketene dimer (AKD) for surface modifi DOI: 10.1007/s00107-008-0275-z
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