What absorbs at 2339 cm⁻¹ in an FTIR spectrum?
A band near 2339 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 4 cited sources
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Methacrylate | 2 | 2 | 1.0 |
| Ketone | 2 | 2 | 1.0 |
| Ester | 2 | 2 | 1.0 |
| Carboxyl (COOH) | 2 | 2 | 1.0 |
| Carbonyl (C=O) | 2 | 2 | 1.0 |
| Amide | 2 | 2 | 1.0 |
| Acetate | 2 | 2 | 1.0 |
| Carbon dioxide | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Nitrile | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Nitrile confidence 1.0
“2236.30 2237 2236 C≡N stretching 2339.49 2339.49”
Ganesan 等 - 2018 - The effect of titanium dioxide nano-filler on the DOI: 10.1007/s10854-018-8815-8 -
Hydroxyl (O-H) confidence 1.0
“x=0.03 x=0.04 x=0.05 x=0.06 O-H stretching 3494.77 3496.70 3494.77 3492.85 3434.98 3454.27 3436.91 Functional group x=0.00 x=0.01 x=0.02 x=0.03 x=0.04 x=0.05 x=0.06 Functional group x=0.00 x=0.01 x=0.02 x=0.03 x=0.04 x=0.05 x=0.06 O-H stret”
Harsono 等 - 2017 - Paramagnetic Zn(1-x)MnxO (0.00≤x≤0.06) Nanopar DOI: 10.4313/TEEM.2017.18.1.46 -
Carbon dioxide confidence 1.0
“The sharp band near 2339 is associated with occluded CO 2 66-67 that could be retained in the material closed porosity.”
Jose Ternero-Hidalgo 等 - 2020 - Operando Reactor-Cell with Simultaneous Transmissi DOI: 10.1016/j.cattod.2016.12.012. -
Carbon dioxide confidence 1.0
“The peak cm-1 at 2339 corresponded to asymmetric O=C=O stretching of CO 2, while the weak band mostly spherical, polydispersed, and inconsistent in size as shown in the TEM image”
Endophytic Bacteria Enterobacter hormaechei Fabricated Silver Nanoparticles and Their Antimicrobial Activity DOI: 10.3390/pharmaceutics13040511
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