What absorbs at 954 cm⁻¹ in an FTIR spectrum?
A band near 954 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 954 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 | 5 | 4 | 1,0 |
| Hydroxyl (O-H) | 3 | 3 | 1,0 |
| Silicon-oxygen (Si-O) | 3 | 3 | 1,0 |
| Methoxy (OCH3) | 3 | 2 | 1,0 |
| Methacrylate | 3 | 2 | 1,0 |
| Acetate | 3 | 2 | 1,0 |
| Silanol (Si-OH) | 2 | 2 | 1,0 |
| Silicon (Si) | 2 | 2 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| C-O single bond | 2 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Silicon carbon | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 0 | 1,0 |
| Aromatic ring | 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 |
|---|---|---|---|
| PMMA | 954, 1722, 1383 | Alkyl C-H, Methoxy (OCH3) | 1 |
| SiC | 954, 791, 805 | Silicon-oxygen (Si-O), Alkyl C-H | 1 |
| magnetite | 954, 1740, 1263 | Hydroxyl (O-H), Silicon-oxygen (Si-O), Methoxy (OCH3) | 1 |
| PVC | 954, 834, 1195 | Alkyl C-H, Methoxy (OCH3), Hydroxyl (O-H) | 1 |
| CS | 954, 1645, 1720 | Hydroxyl (O-H), Alkyl C-H, Methoxy (OCH3) | 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 954 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 carbon confiança 1,0
“The narrow TO feature (TO) mode (Si-C stretching vibration) and a shoulder at 954”
Baek 等 - 2006 - Structural characterization of beta-SiC nanowires DOI: 10.1016/j.msec.2005.09.083 -
Alkyl C-H confiança 1,0
“cm-1) cm-1), cm-1).9, 10 CH stretching (954 and C-C vibration (868 -CHbending (754 and 1383 cm-1 The peak at 872 observed in all samples which is due to C-C stretching and featured for cm-1 amorphous properties of films.”
Ghosh 等 - 2020 - Blown films fabrication of poly lactic acid based DOI: 10.1016/j.mtcomm.2019.100737 -
Alkyl C-H confiança 1,0
“cm-1 cm-1, cm-1 stretching), peaks corresponding to Ca-Halogen, 767 (Ca-O-bond 809 897 cm-1 (stretching-vibration peaks corresponding to C-H-, C-C-, and Ca-O-Ca bonding), 954 cm-1 cm-1, (representing the OH of alcohol), 1195 (for the amine”
Antibacterial and Antibiofilm Activity of Ficus carica-Mediated Calcium Oxide (CaONPs) Phyto-Nanoparticles DOI: 10.3390/molecules28145553 -
confiança 1,0
“The ATR-IR tellite peak (954.39 eV), which are attributed to Cu 2p 3/2 and Cu cm(cid:1)1 spectral analysis indicates that a new peak located at 800”
Evidence on the 2-nitrophenyl octyl ether (NPOE) facilitating Copper(II) transport through polymer inclusion membranes DOI: 10.1016/j.memsci.2015.12.013 -
confiança 1,0
“The spectra show bands centered at 567, 794.5, and 1049.1 with a cm-1 shoulder peak at 1162.9 corresponding to stretching vibrations of siloxane groups cm-1 (Si-O-Si bonds), respectively [41], while the peak centered at 954.5 corresponds”
CO Oxidation Efficiency and Hysteresis Behavior over Mesoporous Pd/SiO2 Catalyst DOI: 10.3390/catal -
Acetate confiança 1,0
“The vibrational peak at 954 corresponds to the C-O stretching vibration,”
Arya 和 Sharma - 2018 - Effect of salt concentration on dielectric propert DOI: 10.1007/s10008-018-3965-4. -
confiança 1,0
“Bands at 954 cm-1 are characteristics for Si-O vibration of beryl and bands at 1014 cm-1 are characterize for internal Si-O stretching vibration while bands at 1171-1203 cm-1 are characteristics for Be-O vibration and Si-O”
Fawzy - 2021 - Separation of fine beryl from quartz via magnetic DOI: 10.37190/ppmp/132329 -
Alkyl C-H confiança 1,0
“cm-1 cm-1 Band 954 is a doublet with 965 and is NMR Mouse: diffusion of solvents and relaxation behaviour assigned to the α-methyl (α-CH 3) attached to the main New and aged controls chain [49, 72].”
Effects of selected solvents on PMMA after prolonged exposure: unilateral NMR and ATR-FTIR investigations DOI: 10.1186/s40494-023-00881-z
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.