What absorbs at 3379 cm⁻¹ in an FTIR spectrum?
A band near 3379 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 3379 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) | 8 | 8 | 1.0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Bromine | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Metal hydroxyl | 1 | 1 | 1.0 |
| Silicon (Si) | 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 |
|---|---|---|---|
| polyurethane | 3379, 2270, 1700 | Alkyl C-H | 1 |
| silver nanoparticles | 3379, 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 3379 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
-
Silicon (Si) confidence 1.0
“The bands observed at 3190 The less intense bands at 449, 496, 582, 678, and 725cm-1 and 3310 are attributed to Si-O stretching, the bands at are attributed to Si-O bending and some bands 3379cm-1 3381cm-1 mightbeduetoCa-Ostretchingvibratio”
Ahmad 等 - 2021 - Spectroscopic Analysis for Harnessing the Quality DOI: 10.1155/2021/6629640 -
confidence 1.0
“The poly(2-methoxy aniline) signal appeared at 3379 cm-1, which was atProcesses2022,10,1878 6of13 tributed to the N-H stretching mode.”
Synthesis, Characterization, and Antibacterial Potential of Poly(o-anisidine)/BaSO4 Nanocomposites with Enhanced Electrical Conductivity DOI: 10.3390/pr10091878 -
confidence 1.0
“The cm-1 bands at 3379 and 3257 related to aluminum species forming strong Lewis and strong Brønsted acidic centers, remained the longest during outgassing of Co 2.0SiBEA sample.”
Baran 等 - 2016 - Influence of the nature and environment of cobalt DOI: 10.1016/j.micromeso.2015.12.061 -
Hydroxyl (O-H) confidence 1.0
“LLM confirmed rule peak-group candidate”
Gu 等 - 2022 - Chemical Component Characterization and Potential DOI: 10.15376/biores.17.2.2525-2546 -
Hydroxyl (O-H) confidence 1.0
“Among them, the most characteristic peak was the peak at 3379.0 cm-1 corresponds to O-H stretching, inter-molecular hydrogen bonding [39].”
Green Synthesis, Characterization, Enzyme Inhibition, Antimicrobial Potential, and Cytotoxic Activity of Plant Mediated Silver Nanoparticle Using Ricinus communis Leaf and Root Extracts DOI: 10.3390/biom11020206 -
Hydroxyl (O-H) confidence 1.0
“The (%) CA-PU45 formation of NH was observed at 3379 cm-1, and this was attributed to the condensation between the 50 Transmittance OH and CNO groups [28].”
Characterization and Performance Evaluation of Cellulose Acetate–Polyurethane Film for Lead II Ion Removal DOI: 10.3390/polym12061317 -
Hydroxyl (O-H) confidence 1.0
“LLM confirmed rule peak-group candidate”
Kronenberg 等 - 2017 - Synchrotron FTIR imaging of OH in quartz mylonites DOI: 10.5194/se-8-1025-2017 -
Hydroxyl (O-H) confidence 1.0
“On the spectra of DDRA, cm-1 the strong peak at 3379 corresponds to the hydroxyl The purifi ed MDDRA was subjected to IS10 Fourierstretching absorption, and its strong intensity indicates the -transform infra-red (FTIR) spectroscopic analys”
Mao 等 - 2017 - Design, preparation and properties of novel flame DOI: 10.1515/pjct-2017-0040
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