What absorbs at 1502 cm⁻¹ in an FTIR spectrum?
A band near 1502 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 1502 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 |
|---|---|---|---|
| Aromatic ring | 4 | 4 | 1,0 |
| Ring structure | 3 | 3 | 1,0 |
| Alkene (C=C) | 3 | 3 | 1,0 |
| Amide | 2 | 2 | 1,0 |
| Alkyl C-H | 2 | 2 | 1,0 |
| Carboxyl (COOH) | 2 | 2 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Ammonium | 1 | 1 | 1,0 |
| Quaternary ammonium | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Lignin | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Nitrate | 1 | 0 | 0,7 |
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 | 1502, 1735, 1650 | Amide | 1 |
| hemicelluloses | 1502, 1735, 1270 | Aromatic ring | 1 |
| polymers | 1502, 1726, 1743 | Amide | 1 |
| lignin | 1502, 1035, 1510 | Aromatic ring | 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 1502 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
“The absorption bands at 668 1502 cm-1 cm-1 and 1440 indicate the metallic stretching vibrations in Fe - O.”
Effect of Gd and Nb on Dielectric and Magnetic Transition temperature of BaTiO3- Li0.5Fe2.5O4 Composites DOI: 10.1016/j.physb.2019.02.035 -
Ring structure confiança 1,0
“Ring stretching 1556 1556 1558 Ring stretching 1502 1498 1498 - Coordinate bond 1461 1461 +CH bending”
Intercalation and in situ formation of coordination compounds with ligand 8-hydroxyquinoline-5-sulfonic acid in the interlayer space of layered silicate magadiite by solid-solid reactions DOI: 10.1016/j.micromeso.2018.02.038 -
Alkyl C-H confiança 1,0
“The peaks at 1502, 1508 and 1249 vibration.27 cm-1 CH stretching are related to C=C bonds in the aromatic”
Allouch 等 - 2019 - CHARACTERIZATION OF COMPONENTS ISOLATED FROM ALGER DOI: 10.1016/j.pecs.2012.02.002 -
Alkene (C=C) confiança 1,0
“266 cm-1 The spectra also exhibited a low-intensity band at 1502 associated with C=C 267 cm-1, vibrations of aromatic rings, bands at 1486 and 1469 associated with CH and CH”
Franca 等 - 2020 - Monitoring diclofenac adsorption by organophilic a DOI: 10.1016/j.envpol.2013.04.012 -
Acetate confiança 1,0
“absorbance from bands at 1730 1502 1370 1234 and 834 (Figure S2B), absorbance from bands at 1730 cm-1, 1502 cm-1, 1370 cm-1, 1234 cm-1, and 834 cm-1 (Figure S2B), which C=O which are mainly ascribed to the stretch in the glucuronic acid of”
Even Visually Intact Cell Walls in Waterlogged Archaeological Wood Are Chemically Deteriorated and Mechanically Fragile: A Case of a 170 Year-Old Shipwreck DOI: 10.3390/molecules25051113 -
C c single bond confiança 1,0
“The sharp peaks for nitro compounds (N-O symmetric stretch) N-O asymmetric stretch Nitro compounds 1504.7608 1507.6201 1505.7042 1501.9015 - C-C stretch (in-ring) Aromatics 1559.0875”
Hydrolysis, Microstructural Profiling and Utilization of Cyamopsis tetragonoloba in Yoghurt DOI: 10.3390/fermentation9010045 -
Ring structure confiança 1,0
“The presence of a band at 1502 cm-1 indicates the tetrazole (CN 4) ring.”
Mahapatra 等 - 2011 - Dissolution Enhancement and Physicochemical Charac DOI: 10.14227/DT180111P39 -
Alkyl C-H confiança 1,0
“The peaks cm-1 at 2923 and 2835 can be assigned to the C-H stretching and the peaks at 1502 and cm-1 1589 were assigned to the C=C stretching bond in the aromatic ring (dashed line cm-1, pointed in Figure 3).”
Development of an Electrospun Patch Platform Technology for the Delivery of Carvedilol in the Oral Mucosa DOI: 10.3390/nano12030438
Tem um espectro com esta banda?
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