What absorbs at 3667 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 3667 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 3667 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

• Hydroxyl (O-H) 신뢰도 1.0

  “Also, the results indicate that the nature of peaks (3667 3101 and 3024 and some new peaks cm(cid:0) 1) O-H PPy/Ze nanocomposite was not altered after RB and RR adsorption (3618 indicate the involvement of functional groups in RB cm(cid:0)”

  Polypyrrole/zeolite composite – A nanoadsorbent for reactive dyes removal from synthetic solution DOI: 10.1016/j.chemosphere.2021.132164
• Hydroxyl (O-H) 신뢰도 1.0

  “The cm-1 theoretical FTIR spectra of starch (a) show that bands in the range of 3689-3446 were related to -OH stretching vibrations which directly connected to the rings, while the bands at cm-1 3667 and 3661 were related to -OH stretching”

  Akman 等 - 2020 - Synthesis and characterization of starch sulfates DOI: 10.1016/j.carbpol.2012.07.075
• Acetate 신뢰도 1.0

  “Other peaks in printed PLA include: the CH3 stretching vibrations at 2829 and 2932 cm-1 and OH stretching vibrations at 3501 and 3667 cm-1 due to the hygroscopic nature of PLA (although these features can also be attributed to the C=O overt”

  Impact of the Fused Deposition (FDM) Printing Process on Polylactic Acid (PLA) Chemistry and Structure DOI: 10.3390/app7060579