What absorbs at 3316 cm⁻¹ in an FTIR spectrum?

Resposta rápida

A band near 3316 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 3316 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

  “cm-1 cm-1 and remaining OH groups at 3316 The C-H stretches was observed at 2926 and 2854 cm-1, cm-1 cm-1 followed by peaks at 1511 1213 and 1068 which indicates the urethane linkages of N-”

  Norshahli 等 - 2018 - Mechanical Properties of Palm Oil Polyol based Pol DOI: 10.1088/1742-6596/1082/1/012041
• confiança 1,0

  “The peak at 3316 cm-1 (observed in mushrooms produced in WS, cm-1 3313 and 3301 for GM and OL, respectively) can be attributed to the N-H stretching vibration and shifted to 3313 and 3301 cm-1 for GM and OL, respectively) can be attributed”

  Pleurotus Mushrooms Content in Glucans and Ergosterol Assessed by ATR-FTIR Spectroscopy and Multivariate Analysis DOI: 10.3390/foods9040535
• confiança 1,0

  “The stretching vibrations of N-H in the Fermi resonance, which ocapproximately 3316 The stretching vibrations of N-H in the Fermi resonance, which curred at around 2932 cm-1, formed amide B bands.”

  Functionalised Hybrid Collagen-Elastin for Acellular Cutaneous Substitute Applications DOI: 10.3390/polym15081929
• Hydroxyl (O-H) confiança 1,0

  “(cm-1) Wavenumbers Assignment 3316 O-H stretching vibration 2900”

  Incorporation of In Situ Synthesized Nano-Copper Modified Phenol-Formaldehyde Resin to Improve the Mechanical Properties of Chinese Fir: A Preliminary Study DOI: 10.3390/polym13060876
• Hydroxyl (O-H) confiança 1,0

  “For all samples, peaks between 3289 cm-1 and 3316 cm-1 were observed, which relate to the stretching of hydroxyl (OH) groups due to the formation of hydrogen bonds [50].”

  Encapsulation of Concentrated Solution Obtained by Block Freeze Concentration in Calcium Alginate and Corn Starch Calcium Alginate Hydrogel Beads DOI: 10.3390/gels9050374
• confiança 1,0

  “1256 C-N stretching of aromatic amine 5 714 C-Cl stretching cm-1 As can be seen in Figure 8, the spectra exhibited a distinctive peak at 3316 due”

  Preparation and Physicochemical Characterization of a Diclofenac Sodium-Dual Layer Polyvinyl Alcohol Patch DOI: 10.3390/polym13152459
• Hydroxyl (O-H) confiança 1,0

  “Characteristic peaks were found at 1631.40 and 3316.43 The vibrational band at cm-1 3316.43 indicated O-H stretching due to the involvement of phenol or alcohol as a cm-1 functional group, whereas the stretching band at 1631.40 represented”

  Development of Iron Nanoparticles (FeNPs) Using Biomass of Enterobacter: Its Characterization, Antimicrobial, Anti-Alzheimer’s, and Enzyme Inhibition Potential DOI: 10.3390/mi13081259
• N h confiança 1,0

  “The BZ structure (signals at 1222 and 948 cm-1) remained for the uncured Por-BZ/Ni and cm-1 Meanwhile, the signal at 3316 for NH stretching of the pyrrole ring had disappeared, Por-BZ/Zn complexes.”

  Zhang 等 - 2022 - Metal Complexes of the Porphyrin-Functionalized Po DOI: 10.3390/polym14030449