What absorbs at 717 cm⁻¹ in an FTIR spectrum?
A band near 717 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 717 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 | 5 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| Metal oxygen | 2 | 2 | 1,0 |
| Aromatic ring | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| C-S single bond | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Chlorine | 1 | 1 | 1,0 |
| N h | 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 |
|---|---|---|---|
| CNTs | 717, 3465, 2941 | Alkyl C-H, Aromatic ring | 1 |
| HDPE | 717, 1369, 1216 | Alkyl C-H, Aromatic ring | 1 |
| LDPE | 717, 1720, 1737 | Alkyl C-H, 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 717 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
-
Metal oxygen confiança 1,0
“USC cm-1 The characteristic sharp bands for Fe-O stretching were found at 717, 623,557 and 443 which confirmed the formation of magnetite nanoparticles.”
Mesoporous magnetite nanoparticles synthesis using the Peltophorum pterocarpum pod extract, their antibacterial efficacy against pathogens and ability to remove a pollutant dye DOI: 10.1016/j.molstruc.2018.10.042 -
Hydroxyl (O-H) confiança 1,0
“Description (cm-1) 717 As-OH vibration Symmetry stretch of As-OH As(III) As(OH) 3 2)- 721 As-O vibration Symmetry stretch of As-O AsO(OH”
The effect of electrocoagulation (EC) on total arsenic, arsenite (As3+) and arsenate (As5+) species removal from model groundwater investigating toxicity and sludge characteristic DOI: 10.1007/s13201-022-01660-0 -
Hydroxyl (O-H) confiança 1,0
“Polarized FTIR spectra of cm-1 films axially stretched CC PPO/carvacrol show that the guest peak at 717 is not dichroic, while the guest peak at cm-1 cm-1 confirms O-H 698 is markedly dichroic.”
Golla 等 - 2021 - Isolated and aggregated carvacrol guest molecules DOI: 10.1038/s41428-021-00511-0 -
Aromatic ring confiança 1,0
“The corresponding aromatic stretching 717 and 1614cm(cid:5)1”
A study on the characteristics of Algerian Hassi-Messaoud asphaltenes: solubility and precipitation DOI: 10.1080/10916466.2021.2017457 -
Alkyl C-H confiança 1,0
“The 717 absorption band is designated to the C-H stretching vibration of the CH 3/CH groups.”
Almousa 等 - 2021 - Paraffin Wax [As a Phase Changing Material (PCM)] DOI: 10.3390/cryst11080951 -
Metal oxygen confiança 1,0
“One visible shoulder peak at ~717 emerged, which is the absorption band of the Fe-O in the FH [26], at the expense of the shoulder peak located at”
Effects of Potassium Loading over Iron–Silica Interaction, Phase Evolution and Catalytic Behavior of Precipitated Iron-Based Catalysts for Fischer-Tropsch Synthesis DOI: 10.3390/catal12080916 -
Chlorine confiança 1,0
“Explicit assignment in text”
Fabrication of Chitosan Nanofibers Containing Some Steroidal Compounds as a Drug Delivery System DOI: 10.3390/polym14102094 -
Alkyl C-H confiança 1,0
“The production and packaging of LDPE, the peak wavelength at represents the CH bend, 3 730cm-1, 719cm-1 717cm-1”
Hossain 等 - 2023 - First evidence of microplastics and their characte DOI: 10.3389/fenvs.2023.1232931
Tem um espectro com esta banda?
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