What absorbs at 980 cm⁻¹ in an FTIR spectrum?
A band near 980 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 980 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) | 12 | 12 | 1,0 |
| Silicon (Si) | 6 | 6 | 1,0 |
| C-O single bond | 6 | 4 | 1,0 |
| Methoxy (OCH3) | 4 | 2 | 1,0 |
| Methacrylate | 4 | 2 | 1,0 |
| Acetate | 4 | 2 | 1,0 |
| Phosphate (PO4) | 3 | 3 | 1,0 |
| Hydroxyl (O-H) | 3 | 3 | 1,0 |
| Alkyl C-H | 3 | 2 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| Thiol | 2 | 2 | 1,0 |
| C-S single bond | 2 | 2 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Sulfate (SO4) | 1 | 1 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Silicon nitrogen | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Silicon silicon | 1 | 1 | 1,0 |
| Silanol (Si-OH) | 1 | 1 | 0,95 |
| Carbonyl (C=O) | 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 |
|---|---|---|---|
| calcium carbonate | 980, 3232, 2954 | Silicon-oxygen (Si-O), C-O single bond, Methoxy (OCH3) | 1 |
| olivine | 980, 3525, 3564 | Silicon (Si) | 1 |
| zirconia | 980, 1100, 460 | Silicon-oxygen (Si-O) | 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 980 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
“The appearance of new peaks around 975-985 and Accepted 1 May 2011 of cement paste has been attributed to the formation of two principal hydration products (C-S-H) and Available online 13 May 2011 2,respectively.Thereisastrongresemblanceofp”
Theoretical and experimental study of structures and properties of cement paste The nanostructural aspects of C–S–H DOI: 10.1016/j.jpcs.2011.05.001 -
Silicon silicon confiança 1,0
“7 (a) Typical absorption, transmission and reflection spectra of cm(cid:3)1 for 30and 60-s Si-Si peaks are at 979.56 and 943.58 vertical SiNWs by electroless process.”
Synthesis and Characterization of Silicon Nanowires by Electroless Etching DOI: 10.1007/s11665-018-3179-z -
confiança 1,0
“The broad absorption at 980 In the present study, quantitative analysis by FTIR cm(cid:2)1 is assigned to the symmetric and asymmetric S-O”
Boke 等 - 2004 - Quantification of CaCO3-CaSO3 center dot 0.5H(2)O- DOI: 10.1016/j.matlet.2003.07.008 -
confiança 1,0
“A small exothermic peak around 980 °C corresponds to α-Al 2O transformation.”
Chandradass 和 Kim - 2009 - Effect of acidity on the citrate-nitrate combustio DOI: 10.1007/s12540-009-1039-y -
N-O bond confiança 1,0
“The strongly shocked olivine with 80Fo% A.Kereszturietal./SpectrochimicaActaPartA:MolecularandBiomolecularSpectroscopy173(2017)637-646 640 cm-1 cm-1) cm-1 shocked olivines have no peaks above 980 and below 830 shifted with values between +1”
Analyzing Raman - Infrared spectral correlation in the recently found meteorite Csátalja DOI: 10.1016/j.saa.2016.10.012 -
S eq o confiança 1,0
“This is the first time a PhysicalChemistryChemicalPhysicsAcceptedManuscript ethoxyethane) sulfonic acid or Aquivion®, with only one ether variable temperature IR study of Nafion thin films is being cm-1 group near the sulfonic acid did not”
Kollath 和 Karan - 2016 - New molecular scale insights into the alpha-transi DOI: 10.1039/C6CP04457C. -
Phosphate (PO4) confiança 1,0
“cm-1 After phosphorylation process, a new peak at wavelength 980 observed which related cm-1 to P-O bond [18] and intense peak at wavelength 1226 due to P=O bond in accordance”
Synthesis, Characterization, and Performance of Graphene Oxide and Phosphorylated Graphene Oxide as Additive in Water-Based Drilling Fluids DOI: 10.1016/j.apsusc.2019.145005 -
C-O single bond confiança 1,0
“If Glyoxal oligomer peaks at 1070 950 and 980 cm-1 C-OH both glyoxal monomers are singly hydrated at the outset, a are assigned to free stretch, dioxolane-linked dioxolane ring can be formed through a second, intramoC-OCasymmetricstretch,an”
Loeffler 等 - 2006 - Oligomer formation in evaporating aqueous glyoxal DOI: 10.1021/es060810wCCC
Tem um espectro com esta banda?
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