What absorbs at 2920 cm⁻¹ in an FTIR spectrum?
A band near 2920 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
Possíveis atribuições de grupos funcionais
| Grupo funcional | Fatos de suporte | Fontes citadas | Maior confiança |
|---|---|---|---|
| Alkyl C-H | 73 | 61 | 1,0 |
| Lipid | 4 | 3 | 0,9 |
| Hydroxyl (O-H) | 3 | 2 | 0,9 |
| Methyl | 3 | 2 | 0,9 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| N h | 1 | 1 | 0,9 |
| Ester | 1 | 1 | 0,9 |
| Fatty acid | 1 | 1 | 0,9 |
| Aromatic ring | 1 | 1 | 0,8 |
| Carbonyl (C=O) | 1 | 1 | 0,7 |
| Carbohydrate | 1 | 1 | 0,6 |
A classificação reflete a evidência acumulada da literatura, não uma única regra autoritária. Sempre confirme com o contexto da sua amostra.
Literatura por trás destas atribuições
-
Alkyl C-H confiança 1,0
“N-heterocyclic compounds such cm-1 group), 2920 (C H stretching of methyl and methylene), as N-[4-(5-Methyl-benzothiazol-2-yl)-phenyl]-acetamide made of cm-1”
Avanthi 和 Banerjee - 2016 - A strategic laccase mediated lignin degradation of DOI: 10.1016/j.indcrop.2016.08.009 -
Alkyl C-H confiança 1,0
“explicit assignment”
Presswood 等 - 2016 - Geochemical and petrographic alteration of rapidly DOI: 10.1016/j.coal.2016.08.022 -
Alkyl C-H confiança 1,0
“Assigned to stretching vibration of -CH in cellulose, hemicellulose and lignin.”
Chen 等 - 2020 - The Degradation and Repolymerization Analysis on S DOI: 10.3390/polym12102337 -
Alkyl C-H confiança 1,0
“Characteristic peak of methylene stretching vibration.”
Chi 等 - 2016 - A TG-FTIR INVESTIGATION AND KINETIC ANALYSIS OF OI DOI: 10.3176/oil.2016.3.03 -
Alkyl C-H confiança 1,0
“Explicit assignment in text: 'absorption at 2920 and 2850 (C-H asymmetric and symmetric stretching in CH2, respectively)'”
El Samrani 等 - 2004 - Clarification of municipal sewage with ferric chlo DOI: 10.1016/j.watres.2003.10.002 -
Alkyl C-H confiança 1,0
“Text: 'peaks 2876 cm-1 at 2920 and correspond to CH and CH'”
Kloster 等 - 2015 - Composite films based on chitosan and nanomagnetit DOI: 10.1016/j.eurpolymj.2015.02.042 -
Alkene (C=C) confiança 1,0
“Typical vibrations of ethylene”
Omastova 等 - 2019 - Electrospinning of Ethylene Vinyl AcetateCarbon N DOI: 10.3390/polym11030550 -
confiança 1,0
“Explicit assignment: -CH stretching mode, asym. at 2920”
Schreiver 等 - 2017 - Synchrotron-based nu-XRF mapping and mu-FTIR micro DOI: 10.1038/s41598-017-11721-z
Tem um espectro com esta banda?
Carregue seu espectro FTIR e obtenha um relatório de interpretação completo — atribuições de picos com citações da literatura, correspondências de biblioteca e uma cadeia de evidências com nível de confiança — em segundos.
Interpretar meu espectro