What absorbs at 3002 cm⁻¹ in an FTIR spectrum?
A band near 3002 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 3002 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 |
|---|---|---|---|
| Alkyl C-H | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 0,8 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
Possible materials
| Materiāls | Atbalstošie pīķi | Overlapping groups | Citētie avoti |
|---|---|---|---|
| PMMA | 3002, 1722, 1383 | Methacrylate, Acetate, 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 3002 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
-
Acetate pārliecība 1,0
“2888.93 Alkene C-H stretching stretching asymmetric 2956.67 2946 2949.92 CH 3 stretching asymmetric 3002 3000 2998.14 CH 3 3027.07 3026.1”
Ganesan 等 - 2018 - The effect of titanium dioxide nano-filler on the DOI: 10.1007/s10854-018-8815-8 -
Hydroxyl (O-H) pārliecība 1,0
“The absorption characteristics cm-1, cm-1, of chitosan with OH stretching were found at 3002 C-H at 2161 and C=O at”
Synthesis and Optimization of Superhydrophilic-Superoleophobic Chitosan–Silica/HNT Nanocomposite Coating for Oil–Water Separation Using Response Surface Methodology DOI: 10.3390/nano12203673 -
Acetate pārliecība 1,0
“cm-1 in charge of asymmetric stretching vibration of the C-O Although the band around 3002 is accepted as an”
Comparison of the Effects of Statins on A549 Nonsmall‐Cell Lung Cancer Cell Line Lipids Using Fourier Transform Infrared Spectroscopy: Rosuvastatin Stands Out DOI: 10.1002/lipd.12296 -
Alkyl C-H pārliecība 1,0
“The weak absorption band at 3002 originated The signal at δ 1.52 ppm assigned to protons in the from CH valence vibrations of the aromatic part of the position 3 of the CH structure.”
Ilic-Stojanovic 等 - 2015 - The improved photostability of naproxen in the inc DOI: 10.2298/HEMIND131128050I -
Alkene (C=C) pārliecība 0,8
“absorption in ACN”
Salisu 等 - 2022 - An improved Fourier-Transform Infrared Spectroscop DOI: 10.5455/javar.2022.i624
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