What absorbs at 2112 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 2112 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.

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 2112 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

• Adsorbed carbon monoxide 신뢰도 1.0

  “In a flow 2 cm-1 of this reaction mixture, a constant intensity of the overlapping adsorbed CO at about 2340 appeared briefly at around 1 2 cm-1 bands at 2112 and 2090 min.”

  In Situ Transient FTIR and XANES Studies of the Evolution of Surface Species in CO Oxidation on Au/TiO₂ DOI: 10.1021/jp0568733
• Azide 신뢰도 1.0

  “Regarding AASC, a strong peak at 2112 cm-1 was assigned to the azide group.”

  Synthesis and Antioxidant Activity of Cationic 1,2,3-Triazole Functionalized Starch Derivatives DOI: 10.3390/polym12010112
• 신뢰도 0.9

  “Explicit assignment: '2112-2114cm-1 observed for the band of CO adsorbed on isolated Pt atoms'”

  Litke 等 - 2019 - Interfacial charge transfer in Pt-loaded TiO2 P25 DOI: 10.1016/j.jphotochem.2018.10.023
• 신뢰도 0.8

  “Text states: 'The existence of CO is verified by bands at 2112'”

  Fabrication and Characterization of Lignin/Dendrimer Electrospun Blended Fiber Mats DOI: 10.3390/molecules26030518