What absorbs at 1793 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1793 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.

Attributions possibles de groupes fonctionnels

Le classement reflète les preuves bibliographiques accumulées, et non une règle faisant autorité. Confirmez toujours dans le contexte de votre échantillon.

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 1793 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.

Bibliographie derrière ces attributions

• Acetate confiance 1,0

  “Its peaks are diffraction intensity in the pattern of 3)vibrationsofC-Obondsincalcite[21,23,24,36].A positionedat2𝜃(Millerindices)=17.96∘ (001),28.64∘ 1793cm-1 (100), corresponded to C=O weak IR absorption band at”

  Loy 等 - 2016 - Effects of Calcination on the Crystallography and DOI: 10.1155/2016/2914368
• Carboxyl (COOH) confiance 1,0

  “cm(cid:3)1).28,29 cm(cid:3)1 and 2107 The band at 1793 is typical of PLA/17AP(b) (a) ("Laccarbonyl-containing compounds such as lactic acid acid," 2018),30 tic an expected product from the hydrolycm(cid:3)1 1300-1000 PLA.31,32 Bands in the”

  Martins 等 - 2022 - The influence of montmorillonite on the flame-reta DOI: 10.3390/POLYM12081701
• confiance 1,0

  “All calcium carbonate samples showed peaks at ~1793, 1429, 1024, 876, and 712 cm-1, respectively, assigned to the asymmetric vibration of the carbon-oxygen bond, which are also in alignment with the previous reports [46,52].”

  Prewetting Induced Hydrophilicity to Augment Photocatalytic Activity of Nanocalcite @ Polyester Fabric DOI: 10.3390/polym14020295
• Acetate confiance 1,0

  “the peak at 1793 was the result of C-O symmetric stretching vibration, cm-1 out-of-plane bending vibration;”

  Investigation on the Painting Materials and Profile Structures Used in Ancient Chinese Folk Architectural Paintings by Multiple Analytical Methods DOI: 10.3390/coatings12030320
• Carbonate confiance 0,9

  “Carbonate band increase at 1793 cm-1.”

  Synthesis of Novel Non-Isocyanate Polyurethane/Functionalized Boron Nitride Composites DOI: 10.3390/polym14193934
• confiance 0,8

  “Attributed to specific vibration of thiophene.”

  Surface Characterization of Modified Electrodes Based on 4-(Azulen-1-yl)-2,6-bis((E)-2-(thiophen-2-yl)vinyl)pyridine DOI: 10.3390/sym14122506