What absorbs at 3021 cm⁻¹ in an FTIR spectrum?
A band near 3021 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 5 cited sources
Quick answer
A band near 3021 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 |
|---|---|---|---|
| Alkyl C-H | 3 | 3 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Aromatic ring | 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 |
|---|---|---|---|
| TiO2 | 3021, 1700, 1093 | Hydroxyl (O-H), Alkyl C-H | 1 |
| PVDF | 3021, 1160, 840 | Alkyl C-H | 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 3021 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
-
Aromatic ring încredere 1,0
“Furthermore, the aromatic C-H absorption of absorption of hydrogen atoms caused a relatively weak band at approximately 3021 cm-1.”
A Novel Fishbone-Like Lead(II) Supramolecular Polymer: Synthesis, Characterization, and Application for Producing Nano Metal Oxide DOI: 10.3390/cryst11040335 -
Alkyl C-H încredere 1,0
“LLM confirmed rule peak-group candidate”
Kumar 和 Madhav - 2021 - Exploration of Inbuilt Novel Properties as Bioreta DOI: 10.22037/ijpr.2021.113734.14457 -
Alkyl C-H încredere 1,0
“9896 cm-1 cm-1 show a 3 red shift of the absorption bands at 3021 which represents the asymmetrical stretching vibration of C-H bond.”
Sensitivity of Pressure Sensors Enhanced by Doping Silver Nanowires DOI: 10.3390/s140609889 -
Hydroxyl (O-H) încredere 1,0
“LLM confirmed rule peak-group candidate”
Aloe vera-Based Polymeric Network: A Promising Approach for Sustained Drug Delivery, Development, Characterization, and In Vitro Evaluation DOI: 10.3390/gels9060474 -
încredere 0,8
“ν(CH) stretching vibrations in 3100-3000 region”
Mino 等 - 2016 - A surface science approach to TiO2 P25 photocataly DOI: 10.1016/j.apcatb.2016.05.029
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