What absorbs at 763 cm⁻¹ in an FTIR spectrum?
A band near 763 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 763 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 |
|---|---|---|---|
| Alkyl C-H | 3 | 3 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| Carbonyl (C=O) | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Chlorine | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Phosphate (PO4) | 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 |
|---|---|---|---|
| graphene oxide | 763, 1150, 3400 | Methacrylate, Acetate, Alkyl C-H | 1 |
| chitosan | 763, 1650, 1655 | Alkyl C-H, Acetate, Methacrylate | 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 763 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 attachment of CTS-Si to HNT can be denoted by the C-H stretching ameter were 762.53 m2/g, 0.3154 cm3 g-1, 0.1911 nm3 g-1, and 6.10 nm, respectively.”
Synthesis and Optimization of Superhydrophilic-Superoleophobic Chitosan–Silica/HNT Nanocomposite Coating for Oil–Water Separation Using Response Surface Methodology DOI: 10.3390/nano12203673 -
Acetate confiança 1,0
“The vibration located at 3,313 is attributed to N-H stretching, the vibration cm-1 cm-1 located at 1,700 is attributed to C=O stretching, and the vibration located at 763 is attributed”
Nansen 等 - 2010 - Using Spatial Structure Analysis of Hyperspectral DOI: 10.3390/rs2040908 -
Acetate confiança 1,0
“The bands from 763 to corresponded to the C-O bond stretching.”
Xu 等 - 2005 - Chitosan-starch composite film preparation and ch DOI: 10.1016/j.indcrop.2004.03.002 -
confiança 1,0
“The Raman signal 311 cm-1 is generated by Mg jumping at the tetrahedral position, and the signal 763 cm-1 is caused by the symmetric stretching vibration of Mg-O in the tetrahedral cell.”
Zhao 等 - 2022 - Gemological and Spectroscopic Characteristics of DOI: 10.3390/min12111359 -
Acetate confiança 1,0
“In Figure 2A, ATR-FTIR spectra of the ARP gave characteristic peaks at to a reduction in the stretching vibrations of the ARP molecule due to its accumulation in cm-1 cm-1 cm-1 1672 (carbonyl peak), 1027 (for C-O-C stretch), as well as 763”
Awais 等 - 2023 - Enhanced Solubility and Stability of Aripiprazole DOI: 10.3390/molecules28093860 -
Alkyl C-H confiança 1,0
“cm-1 The presence of the maximal 830 value is connected with bending vibrations of carboxylic cm-1 ions, while the band at 763 may be associated with rocking vibrations of -CH 2groups [38-45].”
Swelling of Hydrogels Based on Carboxymethylated Starch and Poly(Acrylic Acid): Nonlinear Rheological Approach DOI: 10.3390/polym12112564 -
Carbonyl (C=O) confiança 1,0
“cm-1 cm-1 and 1244 are related to vibrational modes of the aromatic ring, while The bands around 1007 cm-1 cm-1 and 828 are due to the bending of the C=O bond and of the CH bond the bands at 763 cm-1 are likely due to respectively.”
Pace 等 - 2013 - An innovative photochemical facility at DA Phi NE- DOI: 10.1088/1742-6596/425/7/072024 -
Alkyl C-H confiança 1,0
“It could be also noticed in Figure 1, the presence of cm-1 three intense absorption bands with peaks at 1072 corresponding to the stretching cm-1 vibrations Si-O, at 763 assigned to the bending vibrations of the C-H bond [16] and”
Synthesis and Characterization of Some Graphene Oxide Powders Used as Additives in Hydraulic Mortars DOI: 10.3390/app112311330
Tem um espectro com esta banda?
Carregue seu espectro FTIR e obtenha um relatório de interpretação completo — atribuições de picos com citações da literatura, correspondências de biblioteca e uma cadeia de evidências com nível de confiança — em segundos.