What absorbs at 3090 cm⁻¹ in an FTIR spectrum?
A band near 3090 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 4 cited sources
Quick answer
A band near 3090 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.
Mulige funktionelle gruppetildelinger
| Funktionel gruppe | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| Alkyl C-H | 3 | 3 | 1,0 |
| Aromatic ring | 2 | 2 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
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 3090 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.
Litteratur bag disse tildelinger
-
Alkyl C-H tillid 1,0
“Frequency Assignment Theoretical Experimental (Wavenumber, cm-1) (Wavenumber, cm-1) C-H stretching (alkene/aromatic) 3090, 3114 and 3124 2879, 2940 and 2967”
Yusoff 等 - 2018 - Theoretical and Experimental Approach Towards P-Cy DOI: 10.1088/1757-899X/374/1/012086 -
Alkyl C-H tillid 1,0
“cm-1 and a broad signal The spectrum of the pure NIA contains the NH stretching vibration at 3321 cm-1 at 3090 assigned to stretching vibration of CH groups from benzene ring [3].”
Kacso 等 - 2012 - Structural characterization of ambazone salt with DOI: 10.3233/SPE-2012-0570 -
Alkene (C=C) tillid 1,0
“Additionally performed cm-1 1590-1640 (the stretching vibrations of C=C), and QMS analysis allowed describing more precisely the type cm-1 the bands centered at 3090 (the stretching vibrations of the volatile decomposition products emitted”
TG/DSC/FTIR/QMS studies on the oxidative decomposition of terpene acrylate homopolymers DOI: 10.1007/s10973-016-5753-7 -
Aromatic ring tillid 0,9
“FTIR (ATR) ν 3090 (aromatic C-H stretch).”
Elaboration of new modified electrodes (MEs) by electropolymerization of Cu(II)-Schiff base complexes bearing pyrrole moieties: Application in electroreduction of acetophenone and carbon dioxide DOI: 10.1016/j.eurpolymj.2018.10.016
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