What absorbs at 3199 cm⁻¹ in an FTIR spectrum?
A band near 3199 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 3199 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.
Penetapan kumpulan berfungsi yang mungkin
| Kumpulan berfungsi | Fakta sokongan | Sumber dipetik | Keyakinan tertinggi |
|---|---|---|---|
| N h | 3 | 3 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Thiol | 1 | 1 | 1.0 |
Pemeringkatan mencerminkan bukti literatur terkumpul, bukan satu peraturan berwibawa. Sentiasa sahkan terhadap konteks sampel anda.
Possible materials
| Bahan | Puncak sokongan | Overlapping groups | Sumber dipetik |
|---|---|---|---|
| graphene | 3199, 1720, 2097 | Hydroxyl (O-H), Carboxyl (COOH) | 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 3199 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.
Literatur di sebalik penetapan ini
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Thiol keyakinan 1.0
“The FTIR spectrum revealed two adsorption peaks at 3442 and 3199 cm-1, which linked to the characteristic bands of S-H and N-H groups, whereas Figure 5c demonstrates characteristic malachite surface NH2, C-H, C=O, C-O-C and C-S peaks at app”
Ibrahim 等 - 2022 - Effect of Ammonium Sulfide on Sulfidization Flotat DOI: 10.3390/min12101193 -
Carboxyl (COOH) keyakinan 1.0
“C-O-H (bending)/C-O 1248 (stretching), alcohol, ester, ether, carboxylic acid 5 3322 NH (symmetric/asymmetric stretching) 2 O-H (stretching)/-CH 3199 (antisymmetric stretching) 2”
Hayyan 等 - 2015 - Functionalization of graphene using deep eutectic DOI: 10.1186/s11671-015-1004-2 -
N h keyakinan 1.0
“In addition, the acti2 cm-1 ± peaks at 3199 and 3081 corresponding to the stretching vation energy of dehydration process was about 218 11 kJ/ NH of 3-carboxymethyl-6-benzyl-2,5-diketopiperazine (DKP) mol determined by TGA method.”
Non-isothermal dehydration kinetic study of aspartame hemihydrate using DSC, TGA and DSC-FTIR microspectroscopy DOI: 10.1016/j.ajps.2017.12.001
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