What absorbs at 1219 cm⁻¹ in an FTIR spectrum?

Resposta rápida

A band near 1219 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

A classificação reflete a evidência acumulada da literatura, não uma única regra autoritária. Sempre confirme com o contexto da sua amostra.

Materiais possíveis

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 1219 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

• Acetate confiança 1,0

  “characteristics ester carbonyl C=O stretch vibration of PMMA was also appeared at 1766 cm-1, cm-1 The stretching modes were detected at 1219 and 703 assigned to C-O and C=O bonds, respectively.”

  Carrier mechanism of ZnO nanoparticles-embedded PMMA nanocomposite organic bistable memory device DOI: 10.1016/j.solidstatesciences.2019.106046
• confiança 1,0

  “Bands depicting amide II were found at 1517, cm-1, 1586, 1514, and 1522 whereas amide III bands were registered at 1221, 1219, 1227, cm-1 and 1229 for all tested protocol extracts (P1, P2, P3, and P4 respectively) (Figure 3B).”

  Comparison of Different Methods for Spongin-like Collagen Extraction from Marine Sponges (Chondrilla caribensis and Aplysina fulva): Physicochemical Properties and In Vitro Biological Analysis DOI: 10.3390/membranes11070522
• Ring structure confiança 1,0

  “The former one (peak D) can be ing, bond at 1219 assigned to the ring vibrations is obascribed to the C=O bonds pertaining to carboxylic groups, served for samples EG and EG-3Ph reg but not for EG-3Ph.”

  Regeneration of expanded graphite electrodes by joined electrochemical and ozone treatment in liquid phase DOI: 10.1007/s10008-018-4098-5
• Amide confiança 1,0

  “Shore A hardness cm-1 (C-O (cis-) bending (rocking)), 1105 (aliphatic saturated cm-1 (C-N CvO Hardness of HMA7 was measured with a handheld Precision ether)), 1282 (secondary amide, III) + (carbocm-1 (C-N Instrument Shore A digital duromete”

  Bhullar 等 - 2021 - Advanced spectroscopy, microscopy, diffraction and DOI: 10.1039/d0py01348j
• S eq o confiança 1,0

  “The absorptions at 1219, decreases, making the more tortuous path by ethanol due cm-1 1076, and 1020 were assigned to the sulfonic acid to inorganic phase presence and possible TiO particles”

  Dutra Filho 等 - 2014 - Nanostructured Polyelectrolytes Based on SPEEKTiO DOI: 10.4322/polimeros.2014.069
• Hydroxyl (O-H) confiança 1,0

  “rR@SrTiO rR@BaTiO (1900 to 900 In contrast, the FTIR spectra of 3-OH-A and 3cm-1, OH-A showed strong absorptions at 1219, 1141, and 1100 and at 1200 and 1091 respectively, due to the presence of H 2SO on the NP surface.”

  Freimann 等 - 2023 - Nanoparticulate Perovskites for Photocatalytic Wat DOI: 10.3390/nano13142094
• Acetate confiança 1,0

  “The peak cm-1 at 1219 could be assigned to the C-O stretching in the ether or alcohol groups [38].”

  Analysis of Chemical Structure and Antibiofilm Properties of Exopolysaccharides from Lactiplantibacillus plantarum EIR/IF-1 Postbiotics DOI: 10.3390/microorganisms10112200
• Acetate confiança 1,0

  “C-C, C=C (aromatic skeleton), stretching C-C, C=C (aromatic skeleton), stretching 1379 1379 - - 1396 1379 1379 - - 1396 - - - 1271 1270 1272 C-O (guaiacyl unit) stretching - - - 1271 1270 1272 C-O (guaiacyl unit) stretching - - - 1219 1221”

  Activation of Magnesium Lignosulfonate and Kraft Lignin: Influence on the Properties of Phenolic Resin-Based Composites for Potential Applications in Abrasive Materials DOI: 10.3390/ijms18061224