What absorbs at 3452 cm⁻¹ in an FTIR spectrum?
A band near 3452 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 3452 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) | 16 | 16 | 1.0 |
| Carboxyl (COOH) | 3 | 2 | 1.0 |
| Alkyl C-H | 2 | 2 | 1.0 |
| Chitosan | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Metal oxygen | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
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 |
|---|---|---|---|
| ZnO | 3452, 1400, 3430 | Hydroxyl (O-H), Alkyl C-H | 1 |
| GO | 3452, 1720, 1182 | Hydroxyl (O-H), Alkyl C-H, Carboxyl (COOH) | 1 |
| rGO | 3452, 2358, 2930 | Hydroxyl (O-H), Alkyl C-H | 1 |
| ZnO nanoparticles | 3452, 1219, 1726 | Hydroxyl (O-H), Alkyl C-H, Carboxyl (COOH) | 1 |
| silver nanoparticles | 3452, 1636, 1631 | Hydroxyl (O-H), 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 3452 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”
Biologically-induced synthetic manganese carbonate precipitate (BISMCP) for potential applications in heavy metal removal DOI: 10.1016/j.heliyon.2023.e15919 -
Metal oxygen confidence 1.0
“g cm-1, FTIR spectra confirm the presence of O-H and Zn-O stretching modes at 3451.963 and 428.901 respectively, in pure = x and doped ZnO samples.”
Farhat 等 - 2018 - Synthesis and Characterization of Er-Doped Nano Zn DOI: 10.1007/s10948-017-4548-9 -
Water (H2O) confidence 1.0
“The broad bands were observed at 3452 and 1629 corresponds to the water”
Fabrication of the flexible nanogenerator from BTO nanopowders on graphene coated PMMA substrates by sol-gel method DOI: 10.1016/j.matchemphys.2017.02.002 -
Hydroxyl (O-H) confidence 1.0
“LLM confirmed rule peak-group candidate”
A thermal method for obtention of 2 to 3 reduced graphene oxide layers from graphene oxide DOI: 10.1007/s42452-020-03241-9 -
Hydroxyl (O-H) confidence 1.0
“1234 123 O-H Stretching AC C-H Alkanes 3452 AC-TETA 10% MC MC-TETA 10% 3423 1646”
Sulistianti 等 - 2017 - Study of CO2 adsorption capacity of mesoporous car DOI: 10.1088/1742-6596/755/1/011001 -
Hydroxyl (O-H) confidence 1.0
“cm-1 and 972.06 The band at 3452.34 assigned to the hydroxyl (-OH) group whereas the band at cm-1 1413.72 is correspond to Ca-O.”
Wardhani 等 - 2018 - Synthesis of Hydroxyapatite using Precipitated Cal DOI: 10.1088/1757-899X/299/1/012035 -
Hydroxyl (O-H) confidence 1.0
“C-H symmetric bending in cellulose Raw BP 2 BP 1384.21 - Asymmetric COC stretching of lignin O-H 3451.52 3446.48 H2 bonded group of cellulose - 1269.41 C-O stretching of acetyl group in lignin and hemicelluloses”
Biodegradable Green Composites: Effects of Potassium Permanganate (KMnO4) Treatment on Thermal, Mechanical, and Morphological Behavior of Butea Parviflora (BP) Fibers DOI: 10.3390/polym15092197 -
Hydroxyl (O-H) confidence 1.0
“cm-1, The FTIR spectrum of the extract shows a broad absorption peak at 3452 which The FTIR spectrum of the extract shows a broad absorption peak at 3452 cm-1, which was related to the stretching vibration of -OH groups found in alcohols an”
Green Synthesis and Characterization of Silver Nanoparticles Using a Lythrum salicaria Extract and In Vitro Exploration of Their Biological Activities DOI: 10.3390/life12101643
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