What absorbs at 3282 cm⁻¹ in an FTIR spectrum?
A band near 3282 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 8 cited sources
Quick answer
A band near 3282 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.
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Hydroxyl (O-H) | 7 | 7 | 1.0 |
| Amide | 2 | 2 | 1.0 |
| Carbohydrate | 2 | 2 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| Amine primary | 1 | 1 | 0.9 |
| Amino acid | 1 | 1 | 0.7 |
Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.
Possible materials
| Material | Supporting peaks | Overlapping groups | Cited sources |
|---|---|---|---|
| starch | 3282, 1650, 1540 | Hydroxyl (O-H), Alkyl C-H, Carbohydrate | 1 |
| gelatin | 3282, 1652, 3300 | Amide, Alkyl C-H, Hydroxyl (O-H) | 1 |
| glycerol | 3282, 1585, 1630 | Alkyl C-H, Hydroxyl (O-H) | 1 |
| membrane | 3282, 1316, 2927 | Alkyl C-H, Hydroxyl (O-H), Amide | 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 3282 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.
Literature behind these assignments
-
Hydroxyl (O-H) confidence 1.0
“LLM confirmed rule peak-group candidate”
Evaluation of OKRA (Abelmoschus esculentus) Macromolecular Solution for Enhanced Oil Recovery in Kazakhstan Carbonate Reservoir DOI: 10.3390/en15186827 -
Hydroxyl (O-H) confidence 1.0
“LLM confirmed rule peak-group candidate”
Adam 等 - 2023 - Insight into the Effect of Glycerol on Dielectric DOI: 10.3390/molecules28083461 -
Hydroxyl (O-H) confidence 1.0
“of FeNPs were observed at 1636.34 and 3282.19 The presence of the O-H (phenol or alcohol) functional cm-1 group was confirmed by the absorbance band at 3282.19 and the Alkene group present in the wave region cm-1 1636.34 was also confirmed.”
Biologically synthesized iron nanoparticles (FeNPs) from Phoenix dactylifera have anti-bacterial activities DOI: 10.1038/s41598-021-01374-4 -
Hydrogen bond confidence 1.0
“In film samples prepared with and without glycerol, cm-1, the O-H stretching band shifted to 3282 indicating strong hydrogen bonding be3307 cm-1 and the signal at about 1630 cm-1 are assigned to O-H stretching vibrations and tween plasticiz”
Bugnotti 等 - 2023 - Structure of Starch-Sepiolite Bio-Nanocomposites DOI: 10.3390/polym15051207 -
Hydroxyl (O-H) confidence 1.0
“LLM confirmed rule peak-group candidate”
Preparation and Evaluation of Rice Bran‐Modified Urea Formaldehyde as Environmental Friendly Wood Adhesive DOI: 10.1002/gch2.202000044. -
Amide confidence 1.0
“The formation of CuNPs made the peaks of cm-1) cm-1) H-bond (3282 and amide band (1533 to be shifted slightly to the left as observed in Fig.”
Musa 等 - 2016 - Effect of Gelatin-Stabilized Copper Nanoparticles DOI: 10.1186/s11671-016-1656-6 -
Hydroxyl (O-H) confidence 1.0
“The intense growth can be controlled and reduction can mitigate potential peak at 3281.52 corresponds to O-H stretching as shown in health problems caused by pathogenic species (Legionella sp.) Figure 6.”
Development and Demonstration of Membrane to Control Potential Pathogen (Legionella sp.) Associated With Cooling Towers DOI: 10.3389/fenvs.2020.570904 -
Hydroxyl (O-H) confidence 1.0
“In the cm-1 inclusion complex the 3282 stretch band of O-H suffered significant deviation, and also the disappearance cm-1 of the 1664 carbonyl (C=O) band from the SU shows the encapsulation of this molecule in the β-CD”
Silva 等 - 2020 - Theoretical and Experimental Investigations on Inc DOI: 10.21577/0103-5053.20190273
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