What absorbs at 1503 cm⁻¹ in an FTIR spectrum?
A band near 1503 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 1503 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 |
|---|---|---|---|
| N h | 5 | 4 | 1,0 |
| Aromatic ring | 2 | 2 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| Lignin | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Chitosan | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| C=n | 1 | 1 | 0,9 |
A classificação reflete a evidência acumulada da literatura, não uma única regra autoritária. Sempre confirme com o contexto da sua amostra.
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 1503 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
-
confiança 1,0
“However, when the film was stored in a desiccator, the peak around 1503 is mainly caused by the bending mode the color changed very slowly, further confirming that the humidity of the N-H bond and the stretching mode of O-H and C-H bonds, c”
Hydration of mixed halide perovskites investigated by Fourier transform infrared spectroscopy DOI: 10.1063/1.5087914 -
Carboxyl (COOH) confiança 1,0
“cm-1, (representing the OH of alcohol), 1195 (for the amine functional group), 1503 cm-1 cm-1 cm-1 2574 (peaks corresponding to COOH), 2945 (C-H stretching), 3386 (the cm-1 N-H-, C-H-, and O-H-bond stretching of amines and amides), and 3696”
Antibacterial and Antibiofilm Activity of Ficus carica-Mediated Calcium Oxide (CaONPs) Phyto-Nanoparticles DOI: 10.3390/molecules28145553 -
Phosphorus confiança 1,0
“represents 4.8 wt %, the magnesium content reprecm(cid:1)1 peak at 1503 attributed to NOH stretching sents 1.7 wt %, the phosphorus content represents 1.2 cm(cid:1)1 appears at 328°C, the 1085 peak attributed to”
Zhang 等 - 2002 - Thermal properties of Bombyx mori silk fibers DOI: 10.1002/app.11089 -
confiança 1,0
“(cm-1): FTIR (ATR) ν 33693292 (NH 2), 3090 (aromatic C-H stretch), 2950 and 2870 (aliphatic C-H stretch), 1503 (N-H out of plane deformation), 1300 (N-ring stretch), 1280 (CN stretch) and 750 (C-H out of plane).”
Elaboration of new modified electrodes (MEs) by electropolymerization of Cu(II)-Schiff base complexes bearing pyrrole moieties: Application in electroreduction of acetophenone and carbon dioxide DOI: 10.1016/j.eurpolymj.2018.10.016 -
Alkyl C-H confiança 1,0
“C-H stretching, methyl of TMC (1503 C-H bending, CH 3CO (1390 and C-O-C stretching (1158, cm-1).”
Dual-responsive (pH/temperature) Pluronic F-127 hydrogel drug delivery system for textile-based transdermal therapy DOI: 10.1038/s41598-019-48254-6 -
Aromatic ring confiança 1,0
“Characteristic bands of furosemide (spectrum g) g) occur at 1593.5 cm-1 (NH2 scissoring vibration), 1503.1 cm-1 (aromatic ring stretching), 1334.2 cm-1 cm-1 cm-1”
Garbacz 和 Wesolowski - 2018 - DSC, FTIR and Raman Spectroscopy Coupled with Mult DOI: 10.3390/molecules23092136 -
Aromatic ring confiança 1,0
“com PEER-REVIEWED ARTICLE cm-1 The peak at 1503 was indicative of the deformation vibration within the benzene rings in carvacrol (Lin-Vien et al.”
Lipeh 等 - 2019 - Determination of Carvacrol Content in Alaska Yello DOI: 10.1007/s001070050285 -
Lignin confiança 1,0
“LLM confirmed rule peak-group candidate”
Oak wood degradation processes induced by the burial environment in the archaeological site of Biskupin (Poland) DOI: 10.1186/s40494-020-00390-3
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