What absorbs at 1343 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1343 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.

可能性のある官能基アサイン

ランキングは蓄積された文献証拠を反映しており、単一の権威あるルールではありません。常にサンプルのコンテキストと照合して確認してください。

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 1343 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.

これらのアサインの根拠となる文献

• Borate 信頼度 1.0

  “The other peaks of pure bending vibrations at 1343 and 1360 (which indicates (O-B-O) LiDFOB salt (Fig.”

  Polu 等 - 2015 - Poly(ethylene oxide)-lithium difluoro(oxalato)bora DOI: 10.1007/s11581-015-1474-3
• Alkyl C-H 信頼度 1.0

  “The peaks at 1343 and 1450 are attributed to CH from methylene group.”

  Optimization of primary sewage sludge and coal lignite by microwave assisted pyrolysis for the production of bio oil DOI: 10.1080/09593330.2020.1797903
• Hydroxyl (O-H) 信頼度 1.0

  “Moreover, the peak cm-1 cm-1 at 1104 corresponds to the C-O stretching of the C-O-C bond and the peak at 1343 is due to cm-1 the O-H bending of the C-OH group.”

  Durazzo 等 - 2018 - Qualitative Analysis of Traditional Italian Dishes DOI: 10.3390/su10114112
• Acetate 信頼度 1.0

  “cm-1, The bands at vibration of C-O, shifted to 1343 and also an intense, broad band at 1281 belongs cm-1 1000-500 are due to vibrational modes of the to C-N functional group.”

  Ebadi 等 - 2019 - Synthesis and properties of magnetic nanotheranost DOI: 10.2147/IJN.S214923
• C-O single bond 信頼度 1.0

  “cm-1 cm-1 cm-1 the absorption bands at 1343 to 1419 correspond to C-OH stretching, 2927 C-H absorption bands at 1343 cm-1 to 1419 cm-1 correspond to C-OH stretching, 2927 cm-1 C-H stretching, absorption bands at 1343 cm-1 to 1419 cm-1 corre”

  Complex Permittivity and Electromagnetic Interference Shielding Effectiveness of OPEFB Fiber-Polylactic Acid Filled with Reduced Graphene Oxide DOI: 10.3390/ma13204602
• Phosphate (PO4) 信頼度 1.0

  “In organophosphorus layer deposited on iron surface, bands at 1343 and 1023 P=O cm-1, cm-1 cm-1 associated with and P-O-C bonds was observed.”

  Maranescu 等 - 2018 - The corrosion inhibitor behavior of iron in saline DOI: 10.1515/pac-2018-0513
• 信頼度 1.0

  “The peak at 1343.2 suggested In the case of FTIR spectra of norfloxacin, prominent for symmetric stretching vibration of the O-C-O group.”

  Sahoo 等 - 2012 - FTIR and Raman Spectroscopic Investigations of a N DOI: 10.4103/0975-1483.100017
• Amide 信頼度 1.0

  “1379 is not present in the spectra of and The shoulder observed at in the spectra of samples prepared in mildly acidic and neutral media, assigned to C-N stretching, is cm-1 transformed to a well-defined peak at 1343 and 1347 in the spectra”

  Trchova 和 Stejskal - 2011 - Polyaniline The infrared spectroscopy of conducti DOI: 10.1351/PAC-REP-10-02-01