What absorbs at 1382 cm⁻¹ in an FTIR spectrum?
A band near 1382 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 1382 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 | 11 | 10 | 1.0 |
| Methacrylate | 9 | 8 | 1.0 |
| Acetate | 9 | 8 | 1.0 |
| Amide | 9 | 8 | 1.0 |
| Carboxyl (COOH) | 6 | 5 | 1.0 |
| Methoxy (OCH3) | 5 | 5 | 1.0 |
| Secondary amine | 4 | 4 | 1.0 |
| C n single bond | 4 | 4 | 1.0 |
| Ketone | 4 | 3 | 1.0 |
| Ester | 4 | 3 | 1.0 |
| Carbonyl (C=O) | 4 | 3 | 1.0 |
| C-O single bond | 3 | 3 | 1.0 |
| Hydroxyl (O-H) | 3 | 3 | 1.0 |
| Methyl | 2 | 2 | 1.0 |
| Ring structure | 2 | 2 | 1.0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1.0 |
| N-O bond | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Borate | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Lipid | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 1.0 |
| Anhydride | 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 |
|---|---|---|---|
| ZnO | 1382, 1400, 3430 | Alkyl C-H, Acetate, Methacrylate | 2 |
| CuO | 1382, 453, 1000 | Methacrylate, Acetate, Amide | 1 |
| chitosan | 1382, 1650, 1655 | Alkyl C-H, Amide, Acetate | 1 |
| starch | 1382, 1650, 1540 | Methacrylate, Acetate, Alkyl C-H | 1 |
| montmorillonite | 1382, 1637, 523 | Methacrylate, Acetate, Amide | 1 |
| ZnO nanoparticles | 1382, 1219, 1726 | Alkyl C-H, 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 1382 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
“1479 Isoindole stretching 1382 C-H 1237 deformation 3.4.”
Gharagozlou 和 Naghibi - 2018 - Sensitization of ZnO nanoparticles by metal-free p DOI: 10.1016/j.jlumin.2017.12.020 -
confidence 1.0
“CO stretching of calcite 1382 1401 3 1113 Si-O stretching, out-of-plane”
Hayati-Ashtiani - 2012 - Use of FTIR Spectroscopy in the Characterization o DOI: 10.1080/02726351.2011.615895 -
Acetate confidence 1.0
“cm-1 cm-1 1599 (C C aromatic band and stretching) 1014 (C O C bending) cm-1 (C H bend) 1459 cm-1 ( OH bending and C O stretching of COOH acid) 1382 cm-1 741 (ring vibration due to 1,2-disubstituted benzene) cm-1 756”
Telmisartan complex augments solubility, dissolution and drug delivery in prostate cancer cells DOI: 10.1016/j.carbpol.2013.09.077 -
Alkyl C-H confidence 1.0
“coli bacteria respectively.38 In the case of ZnONPs, peaks at 1382.34, 1116.70 and Biosynthesized CuONPs by Bacillus cm-1 519.94 wavenumber were corresponded to C-H sp.”
Antibacterial Activities of Phytofabricated ZnO and CuO NPs by Mentha pulegium Leaf/Flower Mixture Extract against Antibiotic Resistant Bacteria DOI: 10.34172/apb.2021.057 -
Acetate confidence 1.0
“The peaks at 1382 cm-1 and around cm-1 vibration and the C=O stretching of COOH group, respectively.”
Effect of rGO wt.% on the Preparation of rGO/CuO Nanocomposites at Different Test Periods and Temperatures DOI: 10.3390/cryst12101325 -
Amide confidence 1.0
“The sample was dried in an electric oven at 80 contain C-N stretching was showed peak at 1382 The ºC for 2 hours.”
Anjum 等 - 2023 - Photocatalytic degradation of reactive violet 1 by DOI: 10.30955/gnj.004281 -
Amide confidence 1.0
“but the bands at 1558 assigned to N-H The X-ray diffraction patterns characteristic for native potato cm-1, bending (amide II), and at 1382 assigned C-N stretchstarch and starch-based films with glycerol, chitosan, and ing (amide III) are n”
Novel Starch/Chitosan/Aloe Vera Composites as Promising Biopackaging Materials DOI: 10.1007/s10924-020-01661-7 -
Acetate confidence 1.0
“(o-diphenyldeformation, ringout-of-planebending), cm-1 (COOcm-1 (C-O stretching), 1382 stretching) and 1596 (C = C stretching) [42], that The Raman signature of graphitic materials characterized by the D, G, and 2D bands”
Joining Caffeic Acid and Hydrothermal Treatment to Produce Environmentally Benign Highly Reduced Graphene Oxide DOI: 10.3390/nano11030732
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