What absorbs at 1024 cm⁻¹ in an FTIR spectrum?
A band near 1024 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 1024 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 | 16 | 16 | 1.0 |
| Acetate | 16 | 16 | 1.0 |
| Methoxy (OCH3) | 13 | 13 | 1.0 |
| C-O single bond | 13 | 13 | 1.0 |
| Amide | 7 | 7 | 1.0 |
| Phosphate (PO4) | 7 | 7 | 1.0 |
| Carboxyl (COOH) | 5 | 5 | 1.0 |
| Alkyl C-H | 5 | 5 | 1.0 |
| Ketone | 3 | 3 | 1.0 |
| Ester | 3 | 3 | 1.0 |
| Carbonyl (C=O) | 3 | 3 | 1.0 |
| Phosphorus | 3 | 3 | 1.0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1.0 |
| Silicon (Si) | 2 | 2 | 1.0 |
| Carbohydrate | 2 | 2 | 1.0 |
| S eq o | 2 | 2 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| Fatty acid | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Protein | 1 | 1 | 1.0 |
| Carbonate | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| N h | 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 |
|---|---|---|---|
| PVA | 1024, 1660, 2930 | Acetate, Methacrylate, C-O single bond | 1 |
| PET | 1024, 1408, 800 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| curcumin | 1024, 1063, 1153 | Methacrylate, Acetate, C-O single bond | 1 |
| hydrogels | 1024, 3281, 1700 | 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 1024 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
-
Phosphate (PO4) confidence 1.0
“LLM confirmed rule peak-group candidate”
A rapid method for fungal assisted algal flocculation: Critical parameters & mechanism insights DOI: 10.1016/j.algal.2016.10.022 -
Acetate confidence 1.0
“Among the more intense bands, we observe in the IR SE spectra the characteristic bands corresponding to the vibration modes of the trans C-O stretch (~976 cm-1), the ester C-C, C-O stretch (~1024 cm-1), the ethylene glycol CH2 wagging mode”
Laskarakis 等 - 2004 - A Spectroscopic Ellipsometry study of PET membrane DOI: 10.1002/masy.200450109 -
Hydroxyl (O-H) confidence 1.0
“Similarly in the present attempt cm-1 also, the OH group bending vibration was observed at 1024 cm-1.”
CMC stabilized nano silver synthesis, characterization and its antibacterial and synergistic effect with broad spectrum antibiotics DOI: 10.1016/j.carbpol.2016.11.083 -
Alkyl C-H confidence 1.0
“cm-1 cm-1 esters, ethers, -C-N stretching of aromatic amines and The wave number 1639 and 2100 shows the cm-1 α, β CH stretching alkynes at 1024 ,1200 and 2943 carbonyl C=o stretch of unsaturated esters and respectively ((Mohan et al., 2012”
Sadhasivam 和 Nachimuthu - 2020 - Encapsulation and Characterization of Fucoidan-Cur DOI: 10.21786/bbrc/13.11/17 -
Alkyl C-H confidence 1.0
“The absorption cm-1 band appearing about at 1640 was corresponding to the OH bond of water 12 ACCEPTED MANUSCRIPT cm-1 molecules, and the presence of a peak at 1024 was observed due to the bending of cm-1, the H 2C-O-CH bond.”
Santos 等 - 2019 - Physicochemical, thermal and rheological propertie DOI: 10.1016/j.ijbiomac.2019.05.025 -
Acetate confidence 1.0
“The DSC thermogram for 1024cm-1, 1398.02cm-1, cm-1, cm-1 tamarindgumhasrevealedanendothermicpeakfromabout30°C 1588 and 2922.06 on the FTIR C-O 70°C, to spectrum that were corresponding to stretching for ether, CN showing moisture loss from”
Abdullah 等 - 2023 - Formulation of pH-responsive highly swellable hydr DOI: 10.3389/fbioe.2023.1190322 -
Acetate confidence 1.0
“cm-1, discriminate three peaks (1328.80, 1373.5 and 1420.45) At interval (1050-1300) the cm-1 peaks (1024.02, 1046.54, 1087.13 and 1241.93) are noticed and referred to C-O stretching,”
Abead 等 - 2023 - Study physical characteristics of Polyvinyl Alcoho DOI: 10.15764/pche.2014.02001. -
Acetate confidence 1.0
“618 cm-1 cm-1 vibrations), 1509 (C=O and C=C vibrations), 1428 (olefinic C-H bending vibrations), cm-1 cm-1 1278 (aromatic C-O stretching vibrations), 1024 (C-O-C stretching vibrations) [13].”
Ahmed 等 - 2021 - STRUCTURAL AND OPTICAL CHARACTERISTICS OF POLY(VIN DOI: 10.4314/bcse.v35i3.12
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