What absorbs at 1452 cm⁻¹ in an FTIR spectrum?
A band near 1452 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 1452 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 |
|---|---|---|---|
| Alkyl C-H | 36 | 33 | 1.0 |
| Amide | 9 | 9 | 1.0 |
| Methacrylate | 9 | 9 | 1.0 |
| Acetate | 9 | 9 | 1.0 |
| Methoxy (OCH3) | 7 | 7 | 1.0 |
| Aromatic ring | 7 | 6 | 1.0 |
| Methyl | 5 | 5 | 1.0 |
| Secondary amine | 4 | 4 | 1.0 |
| C n single bond | 4 | 4 | 1.0 |
| C-O single bond | 4 | 4 | 1.0 |
| Carboxyl (COOH) | 4 | 4 | 1.0 |
| N h | 3 | 3 | 1.0 |
| Carbonyl (C=O) | 3 | 2 | 1.0 |
| Lipid | 2 | 2 | 1.0 |
| Ketone | 2 | 2 | 1.0 |
| Ester | 2 | 2 | 1.0 |
| Chitosan | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Fatty acid | 1 | 1 | 1.0 |
| Protein | 1 | 1 | 1.0 |
| Lignin | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| Nitrogen heterocycle | 1 | 1 | 1.0 |
| Carbonate | 1 | 1 | 1.0 |
| N-O bond | 1 | 0 | 1.0 |
| Alkene (C=C) | 1 | 0 | 1.0 |
| Protein alpha helix | 1 | 0 | 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 |
|---|---|---|---|
| microplastics | 1452, 1643, 1614 | Alkyl C-H, Methacrylate, Acetate | 1 |
| proteins | 1452, 1735, 1270 | Amide, Methacrylate, Acetate | 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 1452 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
-
Aromatic ring confidence 1.0
“Finally, the PS was characterized by absorption bands at 3060, 3026 (-CH aromatic stretching vibrations), 1600, 1492, and 1452 (-C=C aromatic stretching), indicating the Polymers2023,15,911”
Campanale 等 - 2023 - Fourier Transform Infrared Spectroscopy to Assess DOI: 10.3390/polym15040911 -
Alkyl C-H confidence 1.0
“It was found that the peak cm´1 The stretching peaks at 1452, 1379, 1223, and 2887 correspond to the methyl group.”
Influence of Electrospinning Parameters on Fiber Diameter and Mechanical Properties of Poly(3-Hydroxybutyrate) (PHB) and Polyanilines (PANI) Blends DOI: 10.3390/polym8030097 -
Alkyl C-H confidence 1.0
“and 1185 In addition, in the spectral region between 1100cm cm-1 Furthermore, the second new peak at 1452 also enhances its cm-1 C-H 600 phenyl ring deformations are mainly identified.”
Detecting, characterising and assessing PEEK’s and CF-PEEK’s thermal degradation in rapid high-temperature processing DOI: 10.1016/j.polymdegradstab.2022.110096 -
Amide confidence 1.0
“LLM confirmed rule peak-group candidate”
Hamzeh 等 - 2019 - Effects of Drying Condition on Physico-chemical Pr DOI: 10.1080/10498850.2019.1640817 -
Alkyl C-H confidence 1.0
“2 cm-1, 1493cm-1 and 2851 the aromatic ring vibrations at 1602 and cm-1 and the lines due to the CH deformation vibrations at 1452 2 (Kondyurin et al., 2008;”
60MeV Ni ion induced modifications in nano-CdS/polystyrene composite films DOI: 10.1016/j.radphyschem.2013.06.022 -
Amide confidence 1.0
“Peak Assignment of PAL and the Stretching According to the Spectrum of the PAL Casting Film in Figure 1 and the Spectrum of the Si Substrate in Figure 2 (cm-1) peak position assignment N-H 3348 asym stretching of NH2 ((cid:238)) N-H 3200 sy”
Lu 和 Mi - 2005 - Characterization of the interfacial interaction be DOI: 10.1021/ma0486896 -
Carbonate confidence 1.0
“Peaks at 1452 and 1458 are the characteristic of cm(cid:1)1could 999-1008, identified carbonate component possibly from calcite [41].”
Role of iron in the enhanced reactivity of pulverized Red mud: Analysis by Mssbauer spectroscopy and FTIR spectroscopy DOI: 10.1016/j.cscm.2019.e00266 -
Alkyl C-H confidence 1.0
“CH bending band at 1452 compared to the”
Wang 等 - 2012 - Differentiation in MALDI-TOF MS and FTIR spectra b DOI: 10.1186/1471-2180-12-182
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