What absorbs at 1174 cm⁻¹ in an FTIR spectrum?
A band near 1174 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 1174 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) | 6 | 6 | 1,0 |
| Methacrylate | 6 | 6 | 1,0 |
| C-O single bond | 6 | 6 | 1,0 |
| Acetate | 6 | 6 | 1,0 |
| Alkyl C-H | 6 | 6 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Sulfonate | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Phospholipid | 1 | 1 | 1,0 |
| Protein | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 0,9 |
| S eq o | 1 | 1 | 0,7 |
| 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 |
|---|---|---|---|
| chitosan | 1174, 1650, 1655 | Acetate, Methacrylate, C-O single bond | 1 |
| chitin | 1174, 1650, 1655 | Methacrylate, Acetate, C-O single bond | 1 |
| polymers | 1174, 1726, 1743 | Methacrylate, Acetate, C-O single bond | 1 |
| ZnO | 1174, 1400, 3430 | Acetate, Methacrylate, 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 1174 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
-
Alkyl C-H confiança 1,0
“The result of FTIR studies revealed different functional groups of organic compounds such as out-of-plane cm-1), cm-1), C-O-C bending (564 stretching (711 and CH stretching 2 cm-1) (1174 in chitosan.”
Varma 和 Vasudevan - 2020 - Extraction, Characterization, and Antimicrobial Ac DOI: 10.1021/acsomega.0c01903 -
Carbohydrate confiança 1,0
“Thermal gravimetric analysis was used to determine the total cm(cid:0) 1 band at ~1174 is correlated with proteoglycan protein for both amount of organic content in the shells (excluding the periostracum).”
Organic biopolymers of venus clams: Collagen-related matrix in the bivalve shells with crossed-lamellar ultrastructure DOI: 10.1016/j.bbrep.2021.100939 -
Alkyl C-H confiança 1,0
“The cm-1 therefore reasonable to record that ZnO NPs have been absorption at 1174, 1498, and 1597 is due to the (C-H”
Bir 等 - 2022 - Multifunctional Ternary NLPZnO@L-cysteine-grafted DOI: 10.1021/acsomega.2c04936 -
Acetate confiança 1,0
“C-H Symetric (CH 3) 1240 C-O Stretching (arylesters) 1174 v(C-O) of ester (cottonseed oil), TiO et BaSO vibration 2 4 1119”
Chemical Degradation and Color Changes of Paint Protective Coatings Used in Solar Glass Mirrors DOI: 10.3390/coatings11040476 -
Phospholipid confiança 1,0
“(PO2-) 1458 and 1396 The phosphodiester groups arise lipids arises at 1462 cm-1, cm-1,1174 cm-1 cm-1, 1233 and 1079 which from phospholipids bands at 1339”
Toxicity mechanism of Cu2+ ion individually and in combination with Zn2+ ion in characterizing the molecular changes of Staphylococcus aureus studied using FTIR coupled with chemometric analysis DOI: 10.1007/s10867-020-09560-7 -
Acetate confiança 1,0
“cm-1 (out-of-plane curved NH, out-of-plane curved C-O), 711 (out-of-plane curved NH), cm-1 cm-1 cm-1 1174 (C-O-C stretch), 2865 (CH stretch), and 3594 (-OH stretch).”
Extraction Optimization and Structural Characteristics of Chitosan from Cuttlefish (S. pharaonis sp.) Bone DOI: 10.3390/ma15227969 -
Alkyl C-H confiança 1,0
“LLM confirmed rule peak-group candidate”
Kumar 和 Barth - 2010 - Following Enzyme Activity with Infrared Spectrosco DOI: 10.3390/s100402626 -
Hydroxyl (O-H) confiança 1,0
“Materials 2022, 15, 8826 11 of 18 spectra were found to exhibit very intense double bands with maxima at 1258 and 1174 cm-1 assigned to the CAr-O-H groups from the phenol moieties.”
A Top-Down Approach and Thermal Characterization of Luminescent Hybrid BPA.DA-MMA@Ln2L3 Materials Based on Lanthanide(III) 1H-Pyrazole-3,5-Dicarboxylates DOI: 10.3390/ma15248826
Tem um espectro com esta banda?
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