What absorbs at 1296 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1296 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.

Возможные назначения функциональных групп

Ранжирование отражает накопленные литературные данные, а не единственное авторитетное правило. Всегда проверяйте в контексте вашего образца.

Possible materials

Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.

Spectrum logic

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 1296 cm⁻¹ is usually not enough for material identification by itself.

Real-world usage

This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.

Common mistakes

• Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
• Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
• Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.

Verification advice

When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.

Литература, лежащая в основе этих назначений

• Amide достоверность 1,0

  “The charfrom cm-1 acteristic peak at 1296 indicates the C N stretching vibration of the aromatic Downloaded amine units.”

  A facile synthesis of poly(aniline-co-o-bromoaniline) copolymer: Characterization and application as semiconducting material DOI: 10.1142/S0217979216500089
• достоверность 1,0

  “It is clear that carbon, oxygen, and phosof GNP-g-APP shows a peak at 1296 correspectrum”

  Phosphorization of exfoliated graphite for developing flame retardant ethylene vinyl acetate composites DOI: 10.1016/j.jmrt.2020.04.085
• Amide достоверность 1,0

  “cm21 is generally agreed that the band at 1296 is caused by C-N single, C vN double, and C wN triple bonds were obsp21sp3 b-C”

  Wei - 2001 - Formation of beta-C3N4 crystals at low temperature DOI: 10.1063/1.1327603
• Amide достоверность 1,0

  “The bands at 1296 implied the stretching mode of C-N, which is associated with the presence of povidone.”

  Assiry 等 - 2023 - Microstructural and Elemental Characterization of DOI: 10.3390/app13074517
• достоверность 1,0

  “A negative band at 1296 is assigned C b g to the C-F stretching modes of fluorotyrosine in wild-type”

  Hydrogen Bonding in Human Manganese Superoxide Dismutase Containing 3-Fluorotyrosine DOI: 10.1529/biophysj.105.060616
• Alkyl C-H достоверность 1,0

  “The Raman 3 cm-1 bands located at 1296 and 1454 originated from CH and CH deformation vibrations, respectively.”

  Optical photothermal infrared spectroscopy with simultaneously acquired Raman spectroscopy for two-dimensional microplastic identification DOI: 10.1038/s41598-022-23318-2
• C=n достоверность 1,0

  “Comparatively strong doublet ATR-FTIR bands at ~1557 and ~1542 cm-1 and bands at 1296 and cm-1 814 of layers #2 and #5 (ascribed by a solid heart sign in inset (a) of Figure S1) were assigned to the -C=N, asymmetric -C-N, symmetric -C-N, an”

  Multi-Modal Compositional Analysis of Layered Paint Chips of Automobiles by the Combined Application of ATR-FTIR Imaging, Raman Microspectrometry, and SEM/EDX DOI: 10.3390/molecules24071381
• Acetate достоверность 1,0

  “Furcm-1 (origithermore, the intensity of band at 1296 nating from the C-O stretching vibrations of phenoFigure 6.”

  Radoman 等 - 2015 - Effect of surface modified TiO2 nanoparticles on t DOI: 10.3144/expresspolymlett.2015.83