What absorbs at 1151 cm⁻¹ in an FTIR spectrum?
A band near 1151 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 1151 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 |
|---|---|---|---|
| Methacrylate | 13 | 13 | 1,0 |
| Acetate | 13 | 13 | 1,0 |
| C-O single bond | 13 | 13 | 1,0 |
| Methoxy (OCH3) | 12 | 12 | 1,0 |
| Amide | 4 | 4 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Chitosan | 2 | 2 | 1,0 |
| Carboxyl (COOH) | 2 | 2 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| C n single bond | 2 | 2 | 1,0 |
| Carbohydrate | 2 | 2 | 1,0 |
| Alkyl C-H | 2 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Thiocarbonyl | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Triglyceride | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 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 |
|---|---|---|---|
| cellulose | 1151, 1735, 1650 | Acetate, Methacrylate, C-O single bond | 1 |
| hemicellulose | 1151, 1730, 897 | Methacrylate, Acetate, C-O single bond | 1 |
| GO | 1151, 1720, 1182 | Methacrylate, Acetate, C-O single bond | 1 |
| rGO | 1151, 2358, 2930 | Methacrylate, Acetate, C-O single bond | 1 |
| PCL | 1151, 1751, 1724 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| cotton | 1151, 1030, 1638 | Methacrylate, Acetate, 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 1151 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
-
Acetate confiança 1,0
“[8] also 2 cm-1 found a sharp peak at 1151 due to the stretching-shaking of C=O ester groups of cm-1 triglycerides and of 1163 for walnut oils during roasting.”
Characterizing the Bioactive Ingredients in Sesame Oil Affected by Multiple Roasting Methods DOI: 10.3390/foods11152261 -
Acetate confiança 1,0
“In the synchronous C-O spectra of both film types, the strongest autopeak corresponded to the stretching mode, appearing at1151and1168cm-1fortheLBandspin-coatedfilms,respectively.Thissuggeststhattheconformation of the tert-butoxy group chan”
Shin 等 - 2002 - Structural comparison of Langmuir-Blodgett and spi DOI: 10.1021/la020135d -
Acetate confiança 1,0
“The FTIR band characteristics are as follows: is N-H of amines and C = C stretching of cm-1 alkene, and 1151 is C-O stretching and C-N stretching of amine [32-37].”
Multivariate analysis for FTIR in understanding treatment of used cooking oil using activated carbon prepared from olive stone DOI: 10.1371/journal. -
Ester confiança 1,0
“4a, the intensity and frequency of the ester stretching 1151cm(cid:2)1 liver cells.”
Biophysical evaluation of physiological effects of gilthead sea bream (Sparus aurata) farming using FTIR spectroscopy DOI: 10.1016/j.foodchem.2013.08.111 -
confiança 1,0
“SEM images (Figure 3(a)) of metakaolin showed that the brations of O-C-O due to atmospheric carbonation on the 1151cm-1 sample is a heterogeneous material consisting of irregusurface of kaolin.”
El Alouani 等 - 2019 - Preparation, Characterization, and Application of DOI: 10.1155/2019/4212901 -
Carbohydrate confiança 1,0
“At wavenumber 1151 and 1177 a peak is formed β-CD due to stretching within the COCs present in cellulose and [8,12].”
Grgac 等 - 2022 - The Effect of Ultrasonic Treatment on the Binding DOI: 10.3390/ma15020470 -
Chitosan confiança 1,0
“Chitosan peaks were observed at 897 and 1151 cm-1 cm-1”
Hedayatyanfard 等 - 2019 - Semi-IPN Films and Electrospun Nanofibers Based on DOI: 10.22037/ijpr.2019.1100712 -
Alkyl C-H confiança 1,0
“Bands 1151 and 1057 can be assigned cm-1 O stretch vibrations in resorcinol, and the band at 964 cm-1 probably belongs to the C-H to C-O stretch vibrations in resorcinol, and the band at 964 probably belongs to deformation vibration in the”
Kinetics of Resorcinol-Formaldehyde Condensation—Comparison of Common Experimental Techniques DOI: 10.3390/gels8010008
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