What absorbs at 3667 cm⁻¹ in an FTIR spectrum?
A band near 3667 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 3 cited sources
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.
Iespējamie funkcionālo grupu piešķīrumi
| Funkcionālā grupa | Atbalstošie fakti | Citētie avoti | Augstākā pārliecība |
|---|---|---|---|
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
Possible materials
| Materiāls | Atbalstošie pīķi | Overlapping groups | Citētie avoti |
|---|---|---|---|
| starch | 3667, 1650, 1540 | Hydroxyl (O-H), Methacrylate | 1 |
| PLA | 3667, 1650, 1073 | Methacrylate, Hydroxyl (O-H) | 1 |
| zeolite | 3667, 1013, 1245 | Hydroxyl (O-H) | 1 |
| PPy | 3667, 1043, 910 | Methacrylate | 1 |
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.
Literatūra aiz šiem piešķīrumiem
-
Hydroxyl (O-H) pārliecība 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) pārliecība 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 pārliecība 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
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