What absorbs at 1212 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1212 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 1212 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

  “B-O bond stretching of tetrahedral BO units 4 ~1050 Stretching vibrations of tetrahedral BO units 4 Stretching vibrations of V=O bonds ~1212, ~1276, ~1387 Asymmetric stretching vibrations of B-O bond of trigonal BO units 3”

  Synthesis, thermal and spectroscopic characterization of lithium bismuth borate glasses containing mixed transition metal ions DOI: 10.13036/17533562.57.3.018
• Alkyl C-H 信頼度 1.0

  “LLM confirmed rule peak-group candidate”

  Chen 等 - 2015 - Processing and characterization of electrospun tra DOI: 10.1515/polyeng-2014-0124
• Amide 信頼度 1.0

  “Some of the referred absorptions can be unambiguously the C-N-C stretching at 1212 cm-1 [27,28].”

  An Electrochemical Study on the Copolymer Formed from Piperazine and Aniline Monomers DOI: 10.3390/ma11061012
• 信頼度 1.0

  “Characteristic absorption bands have also been observed for raw EZT related to acteristic absorption bands have also been observed for raw EZT related to O-H stretching cm-1 cm-1, β-lactam O-H stretching vibrations at 3430 and 3265 C=O stre”

  Preformulation Studies of Ezetimibe-Simvastatin Solid Dispersions in the Development of Fixed-Dose Combinations DOI: 10.3390/pharmaceutics14050912
• Acetate 信頼度 1.0

  “Finally, at 1212 3 there is a band of the phosphite group (C-O-P.”

  Valoration of the Synthetic Antioxidant Tris-(Diterbutyl-Phenol)-Phosphite (Irgafos P-168) from Industrial Wastewater and Application in Polypropylene Matrices to Minimize Its Thermal Degradation DOI: 10.3390/molecules28073163
• Amide 信頼度 1.0

  “1212 cm-1 (C-N stretching vibration mode in benzenoid ring system) and 1315 cm-1(C-N stretching vibration of secondary aromatic amine).”

  Kamarudin 等 - 2018 - Adsorption of Copper Ion using Acrylic Acid-g-Poly DOI: 10.1088/1755-1315/140/1/012022
• Acetate 信頼度 1.0

  “Signals at 736 cm-1, 1212 cm-1 and 1047 cm-1 corresponded to 1047 and 900 Signals at 736 1212 and 1047 corresponded to -C=O, -C-C-Oand -C-O groups, respectively, representing the characteristics of CTA -C=O, -C-C-Oand -C-O groups, respectiv”

  Membrane Fouling Behavior of Forward Osmosis for FruitJuice Concentration DOI: 10.3390/membranes11080611
• Acetate 信頼度 1.0

  “The peak at 1212.42 also assigns to the C-O-C symmetric stretching vibration, and cm-1 vibration in (BX)2.”

  Study of the Effect of Sodium Sulfide as a Selective Depressor in the Separation of Chalcopyrite and Molybdenite DOI: 10.3390/min7040051