What absorbs at 1493 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1493 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 1493 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

• Aromatic ring достоверность 1,0

  “2 cm-1, 1493cm-1 and 2851 the aromatic ring vibrations at 1602 and cm-1 and the lines due to the CH deformation vibrations at 1452 2 (Kondyurin et al., 2008;”

  60MeV Ni ion induced modifications in nano-CdS/polystyrene composite films DOI: 10.1016/j.radphyschem.2013.06.022
• C c single bond достоверность 1,0

  “cm(cid:1)1 (cid:2) ABSTRACT: Polymer blend usage has increased in recent matic C C stretch for PS at 1493 were ratioed.”

  Use of Fourier transform infrared and second derivative ultraviolet spectrometry in determining polystyrene-poly(4-vinylpyridine) blend composition DOI: 10.1002/app.22427
• Alkene (C=C) достоверность 1,0

  “The characteristic bands 3, 4 and 5, at 1537, 1493 cm-1, C=C and 1455 respectively, are attributed to asymmetric and symmetric stretching of in the aromatic ring cm-1, S=O skeleton.”

  Biodegradation of Vulcanized SBR: A Comparison between Bacillus subtilis, Pseudomonas aeruginosa and Streptomyces sp DOI: 10.1038/s41598-019-55530-y
• Aromatic ring достоверность 1,0

  “LLM confirmed rule peak-group candidate”

  Investigation of the binding of dioxin selective pentapeptides to a polyaniline matrix DOI: 10.1016/j.synthmet.2012.04.012.
• Amide достоверность 1,0

  “In the high temperature 1100 and 1211 belonged to cm(cid:3)1 This interval, it can be found that the peak at 1493 monodentatenitrate,continuoussecondarynitrateandbridged belongs to cm(cid:3)1 cm(cid:3)1 amide(-NH respectively,48,51 nitrate”

  Study on the mechanism of synthetic (Ce,La)CO3F sulfuric acid acidification and NH3-SCR loaded with Mn and Fe DOI: 10.1039/d1ra02788c
• Ring structure достоверность 1,0

  “cm-1 modes were observed at 1601, 1582, 1506, and 1493 for all four layers, probably due to the cm-1 presence of a phthalic group in the alkyd resins [21,45,46], where a peak pair at 1601 and 1493 cm-1 were assigned to the mono or ortho-sub”

  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
• Aromatic ring достоверность 1,0

  “aromatic and aliphatic stretching cm-1 cm-1, vibrations are assigned to 1493 and 826 respectively [57].”

  Selbmann 等 - 2022 - Impact of Non-Accelerated Aging on the Properties DOI: 10.3390/polym14235246
• Alkene (C=C) достоверность 1,0

  “cm-1, at 684 C-H bending at 744 C-H bending at 818 C-H bending at 872 C-N cm-1, cm-1, stretching aromatic amine at 1261 C-C stretching aromatic ring at 1493 C=C stretching cm-1, cm-1.”

  Synthesis of a Polyaniline Nanoparticle Using a Solution Plasma Process with an Ar Gas Bubble Channel DOI: 10.3390/polym11010105