What absorbs at 867 cm⁻¹ in an FTIR spectrum?
A band near 867 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 867 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 |
|---|---|---|---|
| Methoxy (OCH3) | 3 | 3 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Alkyl C-H | 2 | 1 | 1,0 |
| Sulfate (SO4) | 1 | 1 | 1,0 |
| Sulfonate | 1 | 1 | 1,0 |
| C-S single bond | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Carbonate | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Imide | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Amide | 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 |
|---|---|---|---|
| nanotubes | 867, 1735, 1630 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| hydroxyapatite | 867, 1620, 1639 | Methacrylate, Acetate | 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 867 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
-
Ring structure confiança 1,0
“cm-1 cm-1 R D-ribose increasing time of the accumulation, the values gradually ing, 1049 to C - O stretching, 913 to ct cm-1 D-ribose increase, which can be observed by increasing the diameter ring vibration, and 867 to C endo-sugar.”
Gallic acid-coated silver nanoparticles as perspective drug nanocarriers: bioanalytical study DOI: 10.1007/s00216-022-03955-2 -
Acetate confiança 1,0
“1126 1126 Stretching of C-O bond - - 867 867”
Tuning of ferrites (CoxFe3-xO4) nanoparticles by co-precipitation technique DOI: 10.1007/s42452-019-0244-7 -
Acetate confiança 1,0
“A cm-1 peak at 867 cm-1 was assigned to CH3 group vibration.”
Basheer 等 - 2020 - Synthesis, Characterization, and Analysis of Hybri DOI: 10.3390/polym12061305 -
confiança 1,0
“5c) shows two peaks at 867.3 eV and microscope and energy dispersive X-ray spectrometer (SEM850 eV corresponding to Ni 2p and Ni 2p respectively.”
Flower-like 3-dimensional hierarchical Co3O4/NiO microspheres for 4-nitrophenol reduction reaction DOI: 10.1039/c8na00029h -
Imide confiança 1,0
“Band of unsaturation of maleimide disappeared”
Eugenol-based thermally stable thermosets by Alder-ene reaction: From synthesis to thermal degradation DOI: 10.1002/app.39269. -
Metal oxygen confiança 1,0
“The spectrum of AM-6 shows a Raman band at 867 cm-1, V-O the basis of the above discussions, a possible model is proposed which is the characteristic for the stretching V-O-V wires.24,37”
Guo 等 - 2012 - Structure and Basicity of Microporous Titanosilica DOI: 10.1021/jp305543m -
Carbonate confiança 1,0
“LLM confirmed rule peak-group candidate”
Microstructure and Characteristics of Calcium Phosphate Layers on Bioactive Oxide Surfaces of Air-Sintered Titanium Foams after Immersion in Simulated Body Fluid DOI: 10.3390/ma9120956 -
C-S single bond confiança 1,0
“5) exhibits a very strong cm-1, thiourethane bonds and the second stage-the urethane double absorption band at 2,071 and 2,047 characbonds (weakly visible peak at 332-338 (cid:3)C or as shoulder at teristic of asymmetric and symmetric C=O s”
Rogulska 等 - 2013 - New thermoplastic poly(thiourethane-urethane) elas DOI: 10.1007/s10973-013-3007-5
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