What absorbs at 425 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 425 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 425 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

• Acetate 信頼度 1.0

  “5 we have reinvestigate the infrared spectrum of the gaseous assigned to Mn C O bending vibrations and band observed at 425cm-1 sample of these compounds which are known to be pure, so that 416, 418, belong to Mn C axial stretching vibratio”

  Mahmood 等 - 2006 - Comparative vapour phase FTIR spectra and vibratio DOI: 10.1016/j.saa.2005.11.024
• 信頼度 1.0

  “A sharp band C was observed at 425 which confirmed the zinc-oxygen stretching mode [30].”

  Pai 等 - 2019 - Photocatalytic zinc oxide nanoparticles synthesis DOI: 10.1016/j.ijleo.2019.03.101
• 信頼度 1.0

  “The band cm-1 cm-1 at 425 and 557 indicates the Fe-O bonds of magnetite nanoparticles which are similar to cm-1”

  Yadav 等 - 2020 - Synthesis and Characterization of Amorphous Iron O DOI: 10.3390/nano10081551
• Metal oxygen 信頼度 1.0

  “Moreover, the Ti-O stretching vibration is Transmittance seen at a wave number of around 425 cm-1 [30].”

  Fluoride Evaporation of Low-Fluoride CaF2-CaO-Al2O3-MgO-TiO2-(Na2O-K2O) Slag for Electroslag Remelting DOI: 10.3390/ma16072777
• Amide 信頼度 1.0

  “(cm-1) Wavenumber Band assignment β - 1688 (shoulder) Amide I sheets protein A α - A27 1654 (shoulder) Amide I helix protein β - IgG425,37 1634 (main peak) Amide I sheets - IgG427 1545 (main peak) Amide II unordered”

  Beattie 等 - 2021 - Insight into purification of monoclonal antibodies DOI: 10.1039/d1an00985k
• Metal oxygen 信頼度 1.0

  “Stretching vibration of La-O 430 Stretching vibration of Ce-O 440 Stretching vibration of Sm-O 458 b Stretching vibration of Er-O 425 Stretching vibration of Yb-O 430 c”

  Investigation of Structural, Physical, and Attenuation Parameters of Glass: TeO2-Bi2O3-B2O3-TiO2-RE2O3 (RE: La, Ce, Sm, Er, and Yb), and Applications Thereof DOI: 10.3390/ma15155393
• 信頼度 1.0

  “At the low wavenumbers, the bands at 425 and 564 can be ascribed to the presence of Mg-O and Al-O bonds related to the LDH structure [25,26].”

  Karami 等 - 2020 - Kinetics of Cross-Linking Reaction of Epoxy Resin DOI: 10.3390/polym12051157
• 信頼度 1.0

  “This observation was attributed to 425 the stretching vibrations of Si-O [53, 54] due to the formation of C-(A)-S-H gel.”

  Ruan 等 - 2020 - Improvement of the performance and microstructural DOI: 10.1016/j.conbuildmat.2020.120017)