What absorbs at 1469 cm⁻¹ in an FTIR spectrum?
A band near 1469 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 1469 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 | 14 | 13 | 1.0 |
| Aromatic ring | 4 | 3 | 1.0 |
| Methoxy (OCH3) | 2 | 2 | 1.0 |
| C-O single bond | 2 | 2 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Nucleic acid | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| N-O bond | 1 | 1 | 1.0 |
| Carbonate | 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 |
|---|---|---|---|
| SiO2 | 1469, 1739, 699 | Alkyl C-H, Methoxy (OCH3) | 1 |
| polyethylene | 1469, 1737, 1720 | Alkyl C-H, Methoxy (OCH3), C-O single bond | 1 |
| clay | 1469, 1736, 2855 | Alkyl C-H | 1 |
| PEG | 1469, 1650, 1342 | Alkyl C-H, C-O single bond, Methoxy (OCH3) | 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 1469 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
“A sharp cm(cid:1)1 vibrations are equal on a per hydrogen basis in the alkyl peak at 1469 can be attributed to the scissoring (d(CH chain and the orientation of the alkyl chain in monolayers of vibration of the methylene group 2)).”
Topacli 等 - 2006 - An infrared study on Langmuir-Blodgett films of 14 DOI: 10.1016/j.vibspec.2005.06.002 -
Alkyl C-H confidence 1.0
“In cm-1, addition, a CH scissoring band appears at 1469 and a CH rocking band of methyl and/or”
Yudha 等 - 2019 - A SEM study of unexplored wax microtubes produced DOI: 10.1016/j.micron.2019.102729 -
C-O single bond confidence 1.0
“C=O 1592 stretching +C-N N-H 1532* 1539 1532 1549 1562 bending stretching (Amide II) C=C 1515 1515 stretching of tyrosine C-O-C 1469 1469* bending vibration COO(cid:0)”
Organic biopolymers of venus clams: Collagen-related matrix in the bivalve shells with crossed-lamellar ultrastructure DOI: 10.1016/j.bbrep.2021.100939 -
N-O bond confidence 1.0
“The intense absorption bands at 1469, 1350, 1303, 1040, and 3-1), cm-1 816 are the typical vibrations associated with the nitrate ions (NO so the 1469 cm-1 and 1350 bands are related to the asymmetric and symmetric stretching vibrations cm-”
Enhanced Coating Protection of C-Steel Using Polystyrene Clay Nanocomposite Impregnated with Inhibitors DOI: 10.3390/polym15020372 -
Carbonyl (C=O) confidence 1.0
“cm-1 cm-1 (CO2+ cm-1 H stretching), 1469 (C-CH 2), 1729 (carbonyl group C=O), 1897 (NO) 2), 2840 (C-H cm-1 cm-1 symmetric stretching), 2940 (C-H asymmetric stretching), 3500 (cid:0) 3600 (O-H stretching) [19, 24cm-1 29].”
Bahramnia 等 - 2022 - The Effect of 3-(Glycidoloxy Propyl) Trimethoxy Si DOI: 10.21203/rs.3.rs-381518/v1 -
Alkyl C-H confidence 1.0
“(υ C�C, quinoid 1164 δ bending vibration [2, 3, 11] C-H 1469cm-1 1120cm-1 ring), (υ C�C, benzenoid ring), and 821”
Benahmed 等 - 2018 - Spectroscopic Study of PolyanilineAgCl@Ag Nanocom DOI: 10.1155/2018/7320654 -
Alkyl C-H confidence 1.0
“For the spectrum of PEG, the spectral band appeared at 3463 for cm-1 cm-1 O-H stretching vibrations, 2889 for C-H stretching vibrations, and 1469 and 1342 for C-H cm-1 bending vibrations.”
Green Synthesis and Characterization of Silver/Chitosan/Polyethylene Glycol Nanocomposites DOI: 10.3390/ijms12084872 -
Alkyl C-H confidence 1.0
“cm(cid:4)1 increase from 0% and 28.08% to 1.97% and 41.23%, respecthe sharp moderate band at 1469 was assigned to the tively,aerreactionwithDDP.Nevertheless,thecontentsofMg, rstly, deformation vibration of CH 2.”
Functional group effect on flame retardancy, thermal, and mechanical properties of organophosphorus-based magnesium oxysulfate whiskers as a flame retardant in polypropylene DOI: 10.1039/c7ra02863f
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