What absorbs at 3441 cm⁻¹ in an FTIR spectrum?
A band near 3441 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 3441 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) | 13 | 13 | 1.0 |
| N h | 5 | 5 | 1.0 |
| Alkyl C-H | 2 | 2 | 1.0 |
| Amide | 2 | 2 | 1.0 |
| Carboxyl (COOH) | 2 | 2 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Silanol (Si-OH) | 1 | 1 | 1.0 |
| Amine primary | 1 | 1 | 1.0 |
| Nitro (NO2) | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Amino acid | 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 |
|---|---|---|---|
| AgNPs | 3441, 1232, 1048 | Alkyl C-H, N h, Hydroxyl (O-H) | 1 |
| nanoparticles | 3441, 1732, 1647 | 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 3441 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
-
confidence 1.0
“Regions of approximately 2352-2938 (-C-C2 cm-1 H-) alkyl absorption peaks and approximately 3441 (-N-H-) amino acid absorption peaks were observed.”
Chang 等 - 2017 - Material Characteristics of Hair Cuticles after Ha DOI: 10.18494/SAM.2017.1707 -
Hydroxyl (O-H) confidence 1.0
“FTIR spectra exibits the broad peak cantered at 3441 corresponds to the O-H stretching frequencies.”
Kumar 等 - 2021 - Centella asiatica mediated facile green synthesis DOI: 10.1016/j.inoche.2021.108865 -
confidence 1.0
“In the product, there obtained a broad band at 3441 on electrode surface leads to catalytic deactivation making the cm-1 for N-H stretch.”
Heterogeneous kinetics of thiourea electro‐catalytic oxidation reactions on palladium surface in the aqueous medium DOI: 10.1002/asia.202001016 -
Nitro (NO2) confidence 1.0
“of 1.121 min and 2.029 min indicate 1,3-propanediol, 2-methyl-2cm-1 Peak at 3441 corresponds to asymmetric stretching vibration nitro-, dinitrate and 1,2,3-propanetriol, 1,3-dinitrate, respectively.”
Shareef 和 Bhavya - 2021 - Extraction, phytochemical analysis and in silico a DOI: 10.21276/ap.2021.10.2.59 -
Hydroxyl (O-H) confidence 1.0
“LLM confirmed rule peak-group candidate”
Yazhiniprabha 和 Vaseeharan - 2019 - In vitro and in vivo toxicity assessment of seleni DOI: 10.1016/j.msec.2019.109763 -
N h confidence 1.0
“[101] reported that the obtained biosynthesis AgNPs using green tea have similar characteristic attributed to amine N-H stretching vibrations of pepcm-1 peaks at 3441 and 1635 for stretching vibrations of tide linkages and hydroxyl O-H stre”
Extracellular biosynthesis, OVAT/statistical optimization, and characterization of silver nanoparticles (AgNPs) using Leclercia adecarboxylata THHM and its antimicrobial activity DOI: 10.1186/s12934-022-01998-9 -
Silanol (Si-OH) confidence 1.0
“cm-1 A broad and strong peak at 3441 in the OPC spectrum might be originated from stretching et al., et al., vibrations of the Si-OH bond (Soheilmoghaddam 2014;”
Micro-characterization of Dust and Materials of Dust Origin at a Cement Industry Located in Bangladesh DOI: 10.4209/aaqr.220109 -
Hydroxyl (O-H) confidence 1.0
“(° 1 O-H vibration 3441 C) 180 Injection temperature stretching 2984 2 -CH Injection temperature (s) 20”
Cardenas-Trivino 等 - 2019 - Synthesis and Properties of Bionanocomposites of P DOI: 10.1155/2019/4520927
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