What absorbs at 1349 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1349 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.

가능한 작용기 할당

순위는 단일 권위 규칙이 아닌 축적된 문헌 증거를 반영합니다. 항상 샘플 상황에 대해 확인하세요.

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 1349 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.

이 할당의 배경이 되는 문헌

• Alkyl C-H 신뢰도 1.0

  “1441 1446 1449 1438 - 1441 aromatic C-C stretching, Deformation of C-H 1349 1342 1353 1346 1373 1355 C-H deformation in Hemicellulose and cellulose - 1248”

  Characterization and Thermal Behavior Study of Biomass from Invasive Acacia mangium Species in Brunei Preceding Thermochemical Conversion DOI: 10.3390/su13095249
• Acetate 신뢰도 1.0

  “2 cm-1 cm-1 Bands located at 1349 and 1295 were attributed to C-O asymmetric bending, cm-1 cm-1 whereas peaks at 1093 and 950 correspond to C-O-C stretching.”

  Synthesis and Characterization of Polymer-Based Coatings Modified with Bioactive Ceramic and Bovine Serum Albumin DOI: 10.3390/jfb12020021
• Borate 신뢰도 1.0

  “B-O-B bending vibrations of [BO M V  (3) M 2(1 X )  cm1 In sample G 1, the band at around 1349 has B V”

  Ibrahim 等 - 2014 - Influence of Fe2O3 on the physical, structural and DOI: 10.1007/s40145-014-0107-z
• Acetate 신뢰도 1.0

  “With respect to the organic moiety in 1, the resonances at 1557-1464 cm-1 and 1438cm-1 ν ν and 1438-1349 appeared due to as(C O) and as(C-O) stretching vibrations of the acetate ══ [α-P2W17O61]10can be prepared by removal of a [W(VI) O]4+ u”

  Ibrahim 等 - 2020 - Synthesis, Characterization, Electrochemistry, Pho DOI: 10.3390/molecules25184229
• Carboxyl (COOH) 신뢰도 1.0

  “Explicit assignment in text: 'formate (1349'”

  Metcalfe 等 - 2021 - Advanced spectroscopic analysis and N-15-isotopic DOI: 10.1039/d1an01261d
• Alkyl C-H 신뢰도 1.0

  “For the blend samples, the band shifts to lower is observed at 918 The band observed at 1349 has frequency and the intensity of the band is decreased, which been attributed to combination frequencies of (CH + OH).”

  Siddaiah 等 - 2018 - DOI: 10.1590/1980-5373-MR-2017-0987
• Nitro (NO2) 신뢰도 1.0

  “The nitro stretching vibrations 2) at 1526 and 1349 cm-1, in the spectrum of 2-nitrobenzaldehyde shifted to a lower frequency at 1586 1517 and cm-1, 1337 respectively, upon formation of NB.”

  Sunjuk 等 - 2022 - Transition Metal Complexes of Schiff Base Ligands DOI: 10.3390/inorganics10040043
• Nitro (NO2) 신뢰도 0.9

  “Absorption band for NS gas phase.”

  Selective hydrogenation of nitrostyrene to aminostyrene over Pt/TiO2 catalysts : Effects of pressurized carbon dioxide and catalyst preparation conditions DOI: 10.1016/j.supflu.2011.02.016