What absorbs at 462 cm⁻¹ in an FTIR spectrum?
A band near 462 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 462 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 |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 3 | 3 | 1,0 |
| Silicon (Si) | 3 | 3 | 1,0 |
| Metal oxygen | 3 | 2 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Silicate | 1 | 1 | 1,0 |
| Metalloid oxygen | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Silanol (Si-OH) | 1 | 1 | 1,0 |
| Phosphate (PO4) | 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.
Materiais possíveis
| Material | Picos de suporte | Grupos sobrepostos | Fontes citadas |
|---|---|---|---|
| silica | 462, 1100, 1080 | Silicon-oxygen (Si-O), Silicon (Si), Alkyl C-H | 1 |
| Al2O3 | 462, 1722, 1383 | Metal oxygen, Alkyl C-H, Silicon (Si) | 1 |
| silica nanoparticles | 462, 1718, 2925 | Silicon-oxygen (Si-O), Silicon (Si), Alkyl C-H | 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 462 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
-
Silicon-oxygen (Si-O) confiança 1,0
“nanoparticles showed the symmetric Si-O and O-Si-O stretching bond vibrations at 462, 1088, and 1098 The surface area of Sm2g-1, SiO R-SiO and B-SiO nanopowders were measured to be 7.5513, 201.45, and 247.18 respectively.”
Biogenerated silica nanoparticles synthesized from sticky, red, and brown rice husk ashes by chemical method DOI: 10.1016/j.ceramint.2015.11.172 -
Silicon-oxygen (Si-O) confiança 1,0
“al.39 cm-1 Yan et showed that the band at 1085 should be assigned to SiO tetrahedron base breathing stretch4 cm-1 ing vibration, while the band at approximately 462 should be attributed to the O-Si-O bending mode of the SiO tetrahedron.”
Spectroscopic investigations to reveal synergy between polystyrene waste and paraffin wax in super-hydrophobic sand DOI: 10.1038/s41598-023-36987-4 -
Silicon (Si) confiança 1,0
“Bands occurring at 462 and 514 are assigned to mixed Si-O-Si cm-1 is due to Si-O stretching.”
Bitay 等 - 2017 - PROVENANCE STUDY ON A SMALL SELECTION OF ROMAN POT DOI: 10.24193/subbchem.2017.4.13 -
Carbohydrate confiança 1,0
“4）the In the ESI-MS peak with the greatglucose/ cyclic glucose C6）, 67,58, 67,78, 67,96（open chain est intensity, the Base Peak, at 461.5 corresponded to glucose C3）, 70,48（open chain glucose C4,5/ cyclic glucose m/z”
Cetinkaya 等 - 2020 - D-Glucose-fatty Acid Ester Synthesis with or witho DOI: 10.5650/jos.ess20072 -
confiança 1,0
“showed characteristic absorpcm(cid:5)1 cm(cid:5)1 cm(cid:5)1 N-H for the amide A, bands come from the and 462.3 have phospholipids and the bands between 938.3 tion bands at 3325 cm(cid:5)1, stretching modes in proteins and nucleic acids, ba”
Phytochemical screening, polyphenols, flavonoids and tannin content, antioxidant activities and FTIR characterization of Marrubium vulgare L. from 2 different localities of Northeast of Morocco DOI: 10.1016/j.heliyon.2020.e05609 -
Metalloid oxygen confiança 1,0
“LLM confirmed rule peak-group candidate”
Spectroscopic properties in Er3+-doped germanotellurite glasses and glass ceramics for mid-infrared laser materials DOI: 10.1038/srep43186 -
confiança 1,0
“There is an absorption peak was observed PbO-x%Al Figure 1 shows the FTIR spectra of 2O composites containing 10, 20, 30, 40, 3 around 462 cm-1 related to Pb-O stretching [33], which is observed in pure PbO, whereas, 50, 60, and 100% Al 2O”
Mebed 等 - 2022 - Controlling the Structural Properties and Optical DOI: 10.3390/catal12020142 -
Silicate confiança 1,0
“DTA-TG results for 98-day curing time (Z-Series) cm-1 The peaks at 462 were indicative of silicate structure peaks.”
Sola 和 Ozyazgan - 2019 - Analyses of cement mortars containing reclaimed as DOI: 10.14256/JCE.1607.2016
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