What absorbs at 1458 cm⁻¹ in an FTIR spectrum?
A band near 1458 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 1458 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 | 29 | 28 | 1.0 |
| Aromatic ring | 7 | 7 | 1.0 |
| Methyl | 7 | 7 | 1.0 |
| Amide | 6 | 5 | 1.0 |
| Carbonyl (C=O) | 4 | 4 | 1.0 |
| Ring structure | 4 | 3 | 1.0 |
| Alkene (C=C) | 4 | 3 | 1.0 |
| Methacrylate | 3 | 3 | 1.0 |
| Acetate | 3 | 3 | 1.0 |
| Carbonate | 3 | 3 | 1.0 |
| C c single bond | 3 | 3 | 1.0 |
| Methoxy (OCH3) | 2 | 2 | 1.0 |
| Ketone | 2 | 2 | 1.0 |
| Ester | 2 | 2 | 1.0 |
| Carboxyl (COOH) | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Secondary amine | 2 | 1 | 1.0 |
| Protein | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 1.0 |
| N-O bond | 1 | 1 | 1.0 |
| Chlorine | 1 | 1 | 1.0 |
| Lipid | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Lignin | 1 | 1 | 0.7 |
| C n single bond | 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 |
|---|---|---|---|
| Polyamide | 1458, 1663, 1541 | Amide, Alkyl C-H | 1 |
| chitosan | 1458, 1650, 1655 | Alkyl C-H, Amide | 1 |
| silver nanoparticles | 1458, 1636, 1631 | Alkyl C-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 1458 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
-
Alkyl C-H confidence 1.0
“35(1), 173-179 (2019) cm-1 and then dissolved with 20 mL of HCl 25% and 2 is a peak at 1458.2 indicates a vibration strain cm-1 mL of acetone after that stirred for ± 20 min until CH 2, at 1373.3 indicates the presence of CH 3.”
Aritonang 等 - 2019 - Grafting of Oleic Acid On Cyclic Natural Rubber Re DOI: 10.13005/ojc/350119 -
Alkyl C-H confidence 1.0
“Another peak at 1458.34cm(cid:1)1 may be due to CH bending and a peak at 1067.72cm(cid:1)1 may be due to C-O stretching.”
Kalia 和 Kumar - 2013 - Surface Modification of Sunn Hemp Fibers Using Acr DOI: 10.1080/03602559.2012.717335 -
Water (H2O) confidence 1.0
“Similarly, was 8.416mg which gradually decreased to 0.0123mg due to 1646cm-1, 1458cm-1, 1140cmthe peaks were observed at extensive loss of moisture contents at a temperature of 92.60° 1056cm-1, 7787.6cm-1, 1, and representing other function”
Khalil 等 - 2022 - Fabrication of Silver Nanoparticles from Ziziphus DOI: 10.1155/2022/3164951 -
Alkyl C-H confidence 1.0
“1410cm(cid:2)1, Also, those peaks at 1458, assigned to the bending vibration of methyl and methylene groups can be discriminated cm(cid:2)1 clearly [20].”
Discrimination of different genuine Danshen and their extracts by Fourier transform infrared spectroscopy combined with two-dimensional correlation infrared spectroscopy DOI: 10.1016/j.saa.2012.06.013 -
Hydroxyl (O-H) confidence 1.0
“This was consistent with the corresponded to the C-H stretching, while 1648cm-1 1458cm-1 results of the TS and E values as both decreased the bands at and were assigned totheδ(O-H)bendingsofwaterandCH noticeably at the highest starch ratio”
Xu 等 - 2005 - Chitosan-starch composite film preparation and ch DOI: 10.1016/j.indcrop.2004.03.002 -
Alkyl C-H confidence 1.0
“resent C=C stretching and peaks at 1560, 1542, 1508, and 1458cm-1 However, the increase in radiation dose and shift in assigned to C-H deformation.”
Aarya 等 - 2021 - Gamma Rays Induced Modification in Ultrahigh Molec DOI: 10.1155/2021/7013154 -
Alkyl C-H confidence 1.0
“cm-1 1458 band, there are C-H bending and C-H deformation vibrations of the methyl and methylene groups found in chlorogenic acids together with lignin and polysaccharides.”
Production of oyster mushroom (Pleurotus ostreatus) from some waste lignocellulosic materials and FTIR characterization of structural changes DOI: 10.1038/s41598-023-40200-x -
C c single bond confidence 1.0
“1624 Strong (methyne) 775 Medium Alkenyl C=C stretch Olefinic alkene 1458 Medium C=C-C aromatic ring stretch 775 Medium Alkenyl C=C stretch”
The Antimicrobial Activities of Silver Nanoparticles from Aqueous Extract of Grape Seeds against Pathogenic Bacteria and Fungi DOI: 10.3390/molecules26196081
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