What absorbs at 762 cm⁻¹ in an FTIR spectrum?
A band near 762 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 762 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 |
|---|---|---|---|
| Metal oxygen | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Silicon silicon | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| C-S single bond | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 0 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 0 | 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 |
|---|---|---|---|
| Cellulose | 762, 1735, 1650 | Methoxy (OCH3), Carbohydrate | 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 762 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
-
C-S single bond confiança 1,0
“Copolymer (aqueous) (cm-1) (cm-1) Functional group Wave number Functional group Wave number S bending 762 C S stretching 532 C”
Dey Sadhu 等 - 2020 - Preparation and characterization of polyanilinea DOI: 10.1002/pc.25738 -
Silicon (Si) confiança 1,0
“The peaks at 1139.24 cm-1 and 1095.99 cm-1 are assigned to stretching vibration of Si-O, the peaks at 1031.25 cm-1 and 1008.16 cm-1 are assigned to stretching vibration of Si(Al)-O, the peaks at 787.56 cm-1 and 761.71 cm-1 are assigned to s”
Effects and Mechanism of Fe3+ on Flotation Separation of Feldspar and Epidote with Sodium Oleate at Natural pH DOI: 10.3390/separations9050110 -
confiança 1,0
“α-Phase are 762”
Abdullah 等 - 2014 - Effect of annealing process on the phase formation DOI: 10.1063/1.4895187 -
Alkyl C-H confiança 1,0
“Peaks at 762 and 721 cm-1 corresponded to out-of-plane symmetric deformations of the COOgroup and outof-plane C-H vibrations of bonded benzoate [47,48].”
Butova 等 - 2023 - In Situ FTIR Spectroscopy for Scanning Accessible DOI: 10.3390/nano13101675 -
confiança 1,0
“cm-1 absorption range was between 1100 to 400 and its characteristic absorption band at 951 is cm-1 cm-1 attributed to the Si-O group, while absorption band at 762 (Al-O group), 667 (Al-O-Al), 532, cm-1 and 459 (Si-O group) (Anton Beran, 20”
Fawzy - 2021 - Flotation separation of dravite from phlogopite us DOI: 10.37190/ppmp/138587 -
Acetate confiança 1,0
“1313.37 (C-N asymmetric bending), 1228.74 (C-O-C stretching), 1008.19 (C-O-C asymmetric stretching), 761.61 (Aromatic region in finger print).”
Kumar 等 - 2018 - Identification of Degradant Products of Saroglitaz DOI: 10.5530/ijper.52.4.74 -
Carbohydrate confiança 1,0
“The temperature programs for Comparison between commercial cellulose (CC) and 25∘ C dynamic tests were run from ambient temperature cellulose fiber (CF) shows that both celluloses have identical 700∘ 762cm-1 C.”
Liew 等 - 2015 - Synthesis and Characterization of Cellulose from G DOI: 10.1155/2015/212158 -
C c single bond confiança 1,0
“LLM confirmed rule peak-group candidate”
Miranda Sechi 和 Marques - 2017 - Preparation and Physicochemical, Structural and Mo DOI: 10.1590/1980-5373-MR-2016-1008
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