What absorbs at 3027 cm⁻¹ in an FTIR spectrum?
A band near 3027 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 3027 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.
Atribuiri posibile ale grupelor funcționale
| Grup funcțional | Fapte suport | Surse citate | Încredere maximă |
|---|---|---|---|
| Aromatic ring | 3 | 3 | 1,0 |
| Alkyl C-H | 3 | 3 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
Clasamentul reflectă dovezile acumulate din literatură, nu o singură regulă autoritară. Confirmați întotdeauna în contextul mostrei dvs.
Possible materials
| Material | Vârfuri suport | Overlapping groups | Surse citate |
|---|---|---|---|
| GO | 3027, 1720, 1182 | Alkyl C-H | 1 |
| Graphite | 3027, 1640, 1326 | Alkyl C-H, Aromatic ring | 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 3027 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.
Literatura din spatele acestor atribuiri
-
Alkyl C-H încredere 1,0
“(5CB) [23] 4-pentyl-4'-cyanobiphenyl Assignment Peuk (cm-') C-H aromatic stretching 307 1 C-H aromatic stretching 3027 asymmetric stretching mode of CH3 2957”
Ha 等 - 2001 - Spectroscopic stuides on the liquid crystal alignm DOI: 10.1080/10587250108028259 -
Aromatic ring încredere 1,0
“Peaks at 3027 and 2850 cm-1 are due to aromatic and aliphatic C-H stretch, respectively.”
Gurses 等 - 2016 - Synthesis and Thermal and Textural Characterizatio DOI: 10.12693/APhysPolA.129.853 -
Alkyl C-H încredere 1,0
“and alkoxy (C-OH) group stretching vibrations (1043 In the FTIR spectra of nPS, the cm-1, absorption bands at 3027, 2885, 1491, 1369 and 756 respectively revealed the stretching of the C-H bond in the phenyl ring, the asymmetric stretching”
Khobragade 等 - 2017 - Physico-mechanical properties of nano-polystyrene- DOI: 10.1002/pi.5392
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