What absorbs at 1019 cm⁻¹ in an FTIR spectrum?
A band near 1019 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 1019 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 |
|---|---|---|---|
| Methacrylate | 9 | 9 | 1.0 |
| C-O single bond | 9 | 9 | 1.0 |
| Acetate | 9 | 9 | 1.0 |
| Methoxy (OCH3) | 8 | 8 | 1.0 |
| Alkyl C-H | 4 | 4 | 1.0 |
| Phosphate (PO4) | 3 | 3 | 1.0 |
| Amide | 3 | 2 | 1.0 |
| Carbohydrate | 2 | 2 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Phosphorus | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Silicon nitrogen | 1 | 1 | 0.9 |
| Hydroxyl (O-H) | 1 | 1 | 0.7 |
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 |
|---|---|---|---|
| silver nanoparticles | 1019, 1636, 1631 | Methacrylate, Acetate, C-O single bond | 1 |
| hydroxyapatite | 1019, 1620, 1639 | Methacrylate, Acetate | 1 |
| AgNPs | 1019, 1232, 1048 | Methacrylate, Acetate, 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 1019 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
-
Acetate confidence 1.0
“Similar absorption bands have been reported cm-1 Moreover, the band at 1019 is attributed to the C-O stretching [39].”
Kim 等 - 2022 - Removal of Methyl Red from Aqueous Solution Using DOI: 10.3390/ijerph19159030 -
Amide confidence 1.0
“glucosamine C high temperature, concentration of alkali, reaction time, 2 cm-1 was ascribed to edulis chitosan spectrum, a peak at 863 previous treatment of the chitin, particle size, chitin cm-1 C-N were stretching, absorption peaks at 101”
Varma 和 Vasudevan - 2020 - Extraction, Characterization, and Antimicrobial Ac DOI: 10.1021/acsomega.0c01903 -
Acetate confidence 1.0
“1322 1322 1319 1321 1317 OH bending 1052 1051 1051 1053 1053 The C-O-C bending vibration OH group 1019 1020 1012 1020 1020 C-O bond of the CH2 rocking motion 912 911 906 905 904 C-O stretching + CH2 657-534 590-518 594-579 669-572 691-584 R”
Structural and UV-blocking properties of carboxymethyl cellulose sodium/CuO nanocomposite films DOI: 10.1038/s41598-023-28032-1 -
Acetate confidence 1.0
“The intense band around 1019 was ascribed to - 48-7β h at γ0°C in the case of the fungi, whereas for bacterial cm-1 C-O stretching vibration, while the band at 14γ8 was due to organisms, the incubation period was β4 h under the same the pre”
Synthesis and characterisation of silver nanoparticles using leaf extract of <i>Artemisia afra</i> and their in vitro antimicrobial and antioxidant activities DOI: 10.1049/iet-nbt.2017.0297 -
Phosphate (PO4) confidence 1.0
“LLM confirmed rule peak-group candidate”
Hammerli 等 - 2021 - Measuring in situ CO2 and H2O in apatite via ATR-F DOI: 10.1007/s00410-021-01858-6 -
Acetate confidence 1.0
“The peak at 1019.38 is due to stretching of 2 C=O groups.”
Huang 等 - 2019 - Safed Musli (Chlorophytum borivilianum L.) Callus- DOI: 10.1155/2019/2418785 -
Phosphate (PO4) confidence 1.0
“FTIR peaks at 1019 cm-1 are due to PO43-.”
Microstructure and Characteristics of Calcium Phosphate Layers on Bioactive Oxide Surfaces of Air-Sintered Titanium Foams after Immersion in Simulated Body Fluid DOI: 10.3390/ma9120956 -
Alkyl C-H confidence 1.0
“SEM micrographs of precursor powders calcined for 6 h at: a) 600°C, b) 800°C and c) 1000°C 1019cm-1 correspond to -CH bend [23].”
Megha 等 - 2014 - Nanosized LaCo0.6 Fe0.4O3 perovskites synthesized DOI: 10.2298/PAC1402087M
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