What absorbs at 3201 cm⁻¹ in an FTIR spectrum?
A band near 3201 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 6 cited sources
Quick answer
A band near 3201 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.
Möjliga identifieringar av funktionella grupper
| Funktionell grupp | Stödjande fakta | Citerade källor | Högsta förtroende |
|---|---|---|---|
| Hydroxyl (O-H) | 5 | 4 | 1,0 |
| Protein | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Phenolic | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
Rankingen speglar ackumulerade litteraturbevis, inte en enda auktoritativ regel. Bekräfta alltid mot din provkontext.
Possible materials
| Material | Stödjande toppar | Overlapping groups | Citerade källor |
|---|---|---|---|
| PVP | 3201, 2983, 1648 | Hydroxyl (O-H), Secondary amine | 1 |
| humic acid | 3201, 1660, 1220 | Hydroxyl (O-H) | 1 |
| collagen | 3201, 1408, 1660 | N h, Protein | 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 3201 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 bakom dessa identifieringar
-
Hydroxyl (O-H) förtroende 1,0
“Broaden peak at 3201 correspond to the stretching vibration of cm-1 hydroxyl group (OH or H 2O).”
Rani 和 Yadav - 2015 - Study of Optical Properties of BaMn1-xCrxO3 (x=0.0 DOI: 10.1063/1.4929284 -
Hydroxyl (O-H) förtroende 1,0
“1.03 The FTIR spectra of HA (Figure 1) confirmed the existence of oxygen-containing functional groups, as shown at wavenumbers of 3201 cm-1 (OH stretch of phenolic-OH), 1704 cm-1 (C=C stretch The FTIR spectra of HA (Figure 1) confirmed the”
Kinetics and Thermodynamics of Uranium (VI) Adsorption onto Humic Acid Derived from Leonardite DOI: 10.3390/ijerph16091552 -
N h förtroende 1,0
“264(cid:3)C 266(cid:3)C, Light yellow solid, Yield: 67%, m.p: to Rf: 129.2 (C19), 129.1 (C18), 128.8 (C17), 122.8 (C15), 121.0 cm-1): n-hexane 0.65 [Acetone: (7:3)], FTIR (KBr disk, (C10), 111.8 (C9), 109.6 (C8), 100.6 (C3), 55.9 (C2), H]+,”
Development of an Efficient, One-Pot, Multicomponent Protocol for Synthesis of 8-Hydroxy-4-Phenyl-1,2-Dihydroquinoline Derivatives DOI: 10.1002/jhet.4193 -
Protein förtroende 1,0
“FTIR Comment -22.6 R-EVA France 177.3 38.9 14.4 52.1 12.4 4.9 MAMS321±14 Collagen peaks and higher cm-1band 3201 30094 intensityofthe2900 -21.8 R-EVA Italy 5.9 1.3 7.1 8.2 2.4 4.1 MAMS5580±26 Collagen peaks and higher cm-1band 1395 24343 in”
“Here we go again”: the inspection of collagen extraction protocols for 14C dating and palaeodietary DOI: 10.1080/20548923.2021.1944479 -
Hydroxyl (O-H) förtroende 1,0
“Simvastatin peak at 1740 due (TC) presented typical peaks at 3352.5 cm-1 and 3201 cm-1 corresponding to -OH and - cm-1.”
Simvastatin Loaded Dissolvable Microneedle Patches with Improved Pharmacokinetic Performance DOI: 10.3390/mi13081304 -
Hydroxyl (O-H) förtroende 0,7
“broad band at 3201.01 to 3494.20 may be due to O-H stretching”
Equilibrium, kinetics and thermodynamic studies of cadmium(II) biosorption on Nannochloropsis oculata DOI: 10.1007/s13201-018-0810-y
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