What absorbs at 3434 cm⁻¹ in an FTIR spectrum?
A band near 3434 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 3434 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) | 9 | 9 | 1.0 |
| N h | 5 | 4 | 1.0 |
| Water (H2O) | 2 | 2 | 1.0 |
| C-O single bond | 2 | 2 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Amine primary | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 0.9 |
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 | 3434, 1400, 3430 | Hydroxyl (O-H), C-O single bond | 2 |
| Polyvinylpyrrolidone | 3434, 1660, 1700 | Hydroxyl (O-H) | 1 |
| ZnO nanoparticles | 3434, 1219, 1726 | Hydroxyl (O-H), C-O single bond | 1 |
| Polyurethane | 3434, 2270, 1700 | C-O single bond, N 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 3434 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 strong vibration band at 3434 Si8+ 1(cid:4)1014ioncm(cid:3)2 100MeV ion irradiated for the fluence of is indicates the presence of hydrogen bonds involved in O-H oscilla-”
Synthesis characterization and luminescence studies of 100MeV Si8+ ion irradiated sol gel derived nanocrystalline Y2O3 DOI: 10.1016/j.nimb.2014.02.128 -
N h confidence 1.0
“However, as shown in Figure 3B, κ-carrageenan/starch after enzymatic treatment, the characteristic peak of membranes cm-1 appeared as an additional peak at 3434 due to NH stretching, which confirms the 2 effect of the amylase enzyme on the”
Preparation and Characterization of Super-Absorbing Gel Formulated from -Carrageenan–Potato Peel Starch Blended Polymers DOI: 10.3390/polym13244308 -
confidence 1.0
“Ni-doped ZnO NP s O-H stretching 3433.68 3434.55 3432.89 C-H stretching”
Comparative study on dielectric and structural properties of undoped, Mn-doped, and Ni-doped ZnO nanoparticles by impedance spectroscopy analysis DOI: 10.1007/s10854-019-02517-0 -
Carbohydrate confidence 1.0
“Similarly, the stretching and broadening of 3434cm(cid:1)1) ORCID polysaccharide peaks (1062, 1177 and”
Saba 等 - 2019 - Potential role of bacterial extracellular polymeri DOI: 10.1080/10889868.2019.1602107 -
confidence 1.0
“cm(cid:4)1), cm(cid:4)1, cm(cid:4)1 cm(cid:4)1), cm(cid:4)1, -N-H -C-H stretching (3434 vibration (very weak, 1732 1622 1383 and stretching (2931 cm(cid:4)1, cm(cid:4)1), cm(cid:4)1), gure.”
Insight into carbon quantum dot–vesicles interactions: role of functional groups DOI: 10.1039/d1ra08809b -
Hydroxyl (O-H) confidence 1.0
“O-H vibrations were observed at 3434 and 3260 These Published Y.Zhu,M.Zhao,W.Lu,L.LiandZ.Shen,Org.Lett.,2015,17, 13 al.38 results match well with those reported by Danger et The is”
Direct cyanidation of silver sulfide by heterolytic C–CN bond cleavage of acetonitrile DOI: 10.1039/d0ra00940g -
Amide confidence 1.0
“The new band cm-1 band, because of carbonyl groups in urethane bonds 1727 cm-1 at 3434 is because of stretching vibration of the hydroxyl cm-1 band, assigned to secondary amide (RCONHR');”
Gencturk 等 - 2020 - Effects of Polyvinylpyrrolidone and Ethyl Cellulos DOI: 10.4274/tjps.galenos.2019.87094 -
C-O single bond confidence 1.0
“The cm-1 cm-1 wide peaks present at 3434 and 1117 reflect the presence of OH and C-OH cm-1, stretching vibrations, respectively.”
Hassan 等 - 2021 - Hydroxypropyl Cellulose Loaded with ZnO Nanopartic DOI: 10.3390/ma13020363
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