What absorbs at 3442 cm⁻¹ in an FTIR spectrum?
A band near 3442 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 3442 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 |
| Hydrogen bond | 2 | 2 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Thiol | 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 NPs | 3442, 1664, 875 | Hydroxyl (O-H) | 1 |
| graphene | 3442, 1720, 2097 | Hydroxyl (O-H) | 1 |
| silver nanoparticles | 3442, 1636, 1631 | Hydroxyl (O-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 3442 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
-
Thiol confidence 1.0
“Figure 5a shows cm-1, S-H sorption peaks at 3442 and 3199 which linked to the characteristic bands of and N-H C-H, groups, whereas Figure 5c demonstrates characteristic malachite surface NH 2,”
Ibrahim 等 - 2022 - Effect of Ammonium Sulfide on Sulfidization Flotat DOI: 10.3390/min12101193 -
Alkene (C=C) confidence 1.0
“LLM confirmed rule peak-group candidate”
International Conference on Innovation on Polymer Science and Technology DOI: 10.1088/1757-899X/223/1/012051 -
Hydroxyl (O-H) confidence 1.0
“LLM confirmed rule peak-group candidate”
Biomedical Applications of Biogenic Zinc Oxide Nanoparticles Manufactured from Leaf Extracts of Calotropis gigantea (L.) Dryand. DOI: 10.1007/s12668-020-00746-w -
Hydroxyl (O-H) confidence 1.0
“cm-1 cm-1 3451 corresponds to the shifted band of 3442 of OH band from pure PhCh.”
Yusuf 等 - 2016 - From crab shell to solar cell a gel polymer elect DOI: 10.1039/C6RA04188D. -
Hydroxyl (O-H) confidence 1.0
“LLM confirmed rule peak-group candidate”
Baby 和 Ramaprabhu - 2011 - Enhanced convective heat transfer using graphene d DOI: 10.1186/1556-276X-6-289 -
Hydroxyl (O-H) confidence 1.0
“LLM confirmed rule peak-group candidate”
Enrichment of dark chocolate with vitamin D3 (free or liposome) and assessment quality parameters DOI: 10.1007/s13197-020-04810-x -
Hydroxyl (O-H) confidence 1.0
“LLM confirmed rule peak-group candidate”
A novel green synthesis and characterization of silver nanoparticles using gum tragacanth and evaluation of their potential catalytic reduction activities with methylene blue and Congo red dyes DOI: 10.1186/s40543-016-0098-1 -
Hydroxyl (O-H) confidence 1.0
“monomer used as reference shows an absorption band around 3442 Among the three different signals shown, that corresponding to O1 is cm(cid:0) 1 -OH related with the group stretching vibration, which is also of 172-180 g/mol, the most signif”
Mendiburu-Valor 等 - 2022 - Valorization of urban and marine PET waste by opti DOI: 10.1016/j.resconrec.2022.106413
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