What absorbs at 2341 cm⁻¹ in an FTIR spectrum?
A band near 2341 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
Resposta rápida
A band near 2341 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.
Possíveis atribuições de grupos funcionais
| Grupo funcional | Fatos de suporte | Fontes citadas | Maior confiança |
|---|---|---|---|
| Hydroxyl (O-H) | 4 | 4 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Carboxyl (COOH) | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Thiol | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Carbon dioxide | 1 | 0 | 1,0 |
A classificação reflete a evidência acumulada da literatura, não uma única regra autoritária. Sempre confirme com o contexto da sua amostra.
Materiais possíveis
| Material | Picos de suporte | Grupos sobrepostos | Fontes citadas |
|---|---|---|---|
| hematite | 2341, 1030, 469 | Hydroxyl (O-H), C-O single bond | 1 |
Os materiais são mostrados apenas quando o mesmo conjunto de literatura suporta esta banda e pelo menos um pico característico adicional.
Lógica do espectro
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 2341 cm⁻¹ is usually not enough for material identification by itself.
Uso no mundo real
Este tipo de consulta é comum em identificação de polímeros, triagem de plásticos desconhecidos, solução de problemas de CQ, verificação de materiais reciclados e revisão de atribuição de picos apoiada pela literatura.
Erros comuns
- Tratar uma banda isolada como prova de um material sem verificar pelo menos um ou dois picos de suporte.
- Ignorando sobreposição: vários grupos funcionais podem contribuir próximo ao mesmo número de onda.
- Ignorar a validação quando aditivos, misturas, oxidação ou contaminação podem distorcer o espectro.
Conselho de verificação
Quando a ambiguidade persistir, valide a hipótese com DSC, GC-MS ou TGA, especialmente para misturas, amostras degradadas e polímeros carregados.
Literatura por trás destas atribuições
-
Hydroxyl (O-H) confiança 1,0
“cm-1 The peak at 2341 attributed to the coupling effect of stretching and bending vibrations of -OH [45].”
Influence of pH on the structural, spectral, optical, morphological and photocatalytic properties of ZrO2 nanoparticles synthesized by sol–gel technique DOI: 10.1007/s10854-020-04134-8 -
Hydroxyl (O-H) confiança 1,0
“The adsorption band appeared at cm-1was 2341 ascribed to O-H vibration and CO”
Influence of Ho3+ substitution on structural and magnetic properties of Mg–Mn ferrites DOI: 10.1007/s10854-021-05547-9 -
Acetate confiança 1,0
“Analysis of the FTIR spectra revealed that with mechanical acticm-1 vation process, the peak corresponding to the C-O bandat 2341 vanishes and intensity of carboxyl group cm-1)and nitrateionsband(1396cm-1) (1445 areaffected.The presenceofth”
Low-temperature synthesis of Sr2FeMoO6 double perovskite; structure, morphology, and magnetic properties DOI: 10.1016/j.ceramint.2020.03.264 -
Acetate confiança 1,0
“Tentatively Assigned Band Wavelength (cm-1) Tentatively Assigned Band 3450 O-H stretching 3450 O-H stretching 2341 -C=O stretching of the aliphatic compound 2341 -C=O stretching of the aliphatic compound 1650”
Microstructural Characterization of Fibric Peat Stabilized with Portland Cement and Silica Fume DOI: 10.3390/ma16010018 -
Thiol confiança 1,0
“The peak at 2341 is assigned to S-H vibration in the thiol group with minimum intensity group and may be attributed to the deprotonation of the thiol group in the cysteine molecule cm-1, that is the pre-requisite for the formation of Au-Ag-”
Cysteine-silver-gold Nanocomposite as potential stable green corrosion inhibitor for mild steel under acidic condition DOI: 10.1038/s41598-019-57181-5 -
Alkyl C-H confiança 1,0
“The main bands are at 2925.48 and corresponding to the asymmetric and symmetric stretch C-H aliphatic 2341.16cm(cid:3)1 m CH, 2360.44 and corresponding to the asymmetric 1620.5cm(cid:3)1 m and symmetric stretch of atmospheric CO CO2, cor2 C”
Blasco-Lopez 等 - 2015 - Methodology for characterising microlayers in hist DOI: 10.1016/j.conbuildmat.2015.05.135 -
Carboxyl (COOH) confiança 1,0
“While the band at 3450 cm-1 cm-1 is attributed to the presence of carboxylate anion and another peak at 2341 is that of CH 2 cm-1 rocking and OH bending modes or the C-OH group of frees polysaccharides.”
Farghaly 等 - 2021 - Physicochemical study and application for pyrolusi DOI: 10.37190/ppmp/131944 -
Phosphate (PO4) confiança 1,0
“The peaks at 2341 and 2358 43H+ of the reaction of PO with the that came from the COOH corresponded to the stretching vibration of the P-OH in the cm-1 group.”
Ran 等 - 2014 - Molecular Mechanism of Nano-Hydroxyapatite Surface DOI: 10.14233/ajchem.2014.18110
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