What absorbs at 3464 cm⁻¹ in an FTIR spectrum?
A band near 3464 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 3464 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) | 10 | 9 | 1.0 |
| N h | 4 | 4 | 1.0 |
| Secondary amine | 3 | 3 | 1.0 |
| N n bond | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| C=n | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Silanol (Si-OH) | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Hydrogen bond | 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 |
|---|---|---|---|
| cellulose | 3464, 1735, 1650 | Hydroxyl (O-H) | 1 |
| magnetite | 3464, 1740, 1263 | 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 3464 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
-
Hydrogen bond confidence 1.0
“The stretching vibration of -OH at 3464.15 Figure 4 and the results showed insignificant cm-1 revealed the intermolecular hydrogen bonds [25].”
Preparation of In Situ Cross - Linked N - Maleoyl Chitosan - Oxidized Sodium Alginate Hydrogels for Drug Delivery Applications DOI: 10.3889/oamjms.2019.850 -
Hydroxyl (O-H) confidence 1.0
“LLM confirmed rule peak-group candidate”
Salem 等 - 2019 - Synthesis of compounds having antimicrobial activi DOI: 10.1016/j.bioorg.2019.03.013 -
Alkyl C-H confidence 1.0
“The common presence of peaks at 3464 3454 and cm-1 3349 in untreated POCF, alkali treated POCF and CMF showed lignocellulostic contents cm-1 with -CH and -OH groups having stretched vibration [35].”
Sumesh 等 - 2020 - Peanut oil cake-derived cellulose fiber Extractio DOI: 10.1016/j.ijbiomac.2020.02.118 -
confidence 1.0
“3345 3345 3343 [21,24,27] (10) N-H stretching 3464”
Ay 和 Aydinli - 2004 - Comparative investigation of hydrogen bonding in s DOI: 10.1016/j.optmat.2003.12.004 -
Hydroxyl (O-H) confidence 1.0
“The broadband at 3464 cm-1 was assigned to the stretching vibration of lattice hydroxyl (-OH) groups [23].”
The synthesis of hydroxyapatite with different crystallinities by controlling the concentration of recombinant CEMP1 for biological application DOI: 10.1016/j.msec.2015.10.029 -
confidence 1.0
“The characteristic band at 3464 anti-symmetric and symmetric stretching vibrations of Si-O-Si groups are observed at characteristic bands at 1083 cm-1 and 804 cm-1, respectively [24].”
Functionalized KIT-6/Polysulfone Mixed Matrix Membranes for Enhanced CO2/CH4 Gas Separation DOI: 10.3390/polym12102312 -
N h confidence 1.0
“compounds in the range 3444-3280 The presence of NH group indicates that this occur in free ligand at 3464 and 3310 cm-1, can also be observed in the spectra of the coor-”
Antitumor Activity against A549 Cancer Cells of Three Novel Complexes Supported by Coating with Silver Nanoparticles DOI: 10.3390/ijms23062980 -
Hydroxyl (O-H) confidence 1.0
“The infrared spectrum of sorbitan monooleate shows that band at 3463.53 cm-1 is the characteristic of the O-H stretching vibration of the acid.”
Fawzy - 2021 - Separation of fine beryl from quartz via magnetic DOI: 10.37190/ppmp/132329
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