What absorbs at 1029 cm⁻¹ in an FTIR spectrum?
A band near 1029 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 1029 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 | 24 | 23 | 1.0 |
| Acetate | 24 | 23 | 1.0 |
| C-O single bond | 24 | 22 | 1.0 |
| Methoxy (OCH3) | 23 | 22 | 1.0 |
| Amide | 5 | 5 | 1.0 |
| Hydroxyl (O-H) | 5 | 5 | 1.0 |
| Carbohydrate | 5 | 4 | 1.0 |
| Carboxyl (COOH) | 4 | 4 | 1.0 |
| Alkyl C-H | 3 | 3 | 1.0 |
| Secondary amine | 3 | 3 | 1.0 |
| C n single bond | 3 | 3 | 1.0 |
| Carbonyl (C=O) | 3 | 3 | 1.0 |
| Siloxane (Si-O-Si) | 3 | 3 | 1.0 |
| Silicon-oxygen (Si-O) | 3 | 3 | 1.0 |
| Silicon (Si) | 3 | 3 | 1.0 |
| Nucleic acid | 2 | 2 | 1.0 |
| S eq o | 2 | 2 | 1.0 |
| Ketone | 2 | 2 | 1.0 |
| Ester | 2 | 2 | 1.0 |
| Phosphate (PO4) | 2 | 2 | 1.0 |
| Metal oxygen | 2 | 2 | 1.0 |
| Ring structure | 2 | 2 | 1.0 |
| Silicate | 1 | 1 | 1.0 |
| Lignin | 1 | 1 | 1.0 |
| Phosphorus | 1 | 1 | 1.0 |
| Sulfonyl | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Phospholipid | 1 | 1 | 1.0 |
| Amino acid | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Silanol (Si-OH) | 1 | 1 | 0.95 |
| Sulfonate | 1 | 1 | 0.8 |
| Carbon dioxide | 1 | 0 | 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 |
|---|---|---|---|
| glycerol | 1029, 1585, 1630 | Methacrylate, Acetate, C-O single bond | 1 |
| CeO2 | 1029, 1554, 1630 | Acetate, Methacrylate, Methoxy (OCH3) | 1 |
| PMMA | 1029, 1722, 1383 | 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 1029 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
-
Hydroxyl (O-H) confidence 1.0
“In the FTIR spectra of GT extract, obvious absorption bands at 3401 1628 1628 cm-1, and 1029 cm-1, corresponding to O-H/N-H, C=O, and C-O groups were observed, cm-1, and 1029 corresponding to O-H/N-H, C=O, and C-O groups were observed, resp”
Aziz 等 - 2017 - From Insulating PMMA Polymer to Conjugated Double DOI: 10.3390/polym9110626 -
Nucleic acid confidence 1.0
“At the same time, this spectrum contains peaks at 1029 PO2cm-1, corresponding to from DNA, RNA and phospholipids, and 1520 which have been observed in normal breast tissues before.”
The Spectroscopic Similarity between Breast Cancer Tissues and Lymph Nodes Obtained from Patients with and without Recurrence: A Preliminary Study DOI: 10.3390/molecules25143295 -
Metal oxygen confidence 1.0
“2 cm-1and 700cm-1 The bands at 1029 that around are postulated to be δ(Ce-O-Ce) mode [78].”
Evaluation of Chemical Stability, Thermal Expansion Coefficient, and Electrical Properties of Solid State and Wet-Chemical Synthesised Y and Mn -codoped CeO2 for Solid Oxide Fuel Cells DOI: 10.1016/j.jpowsour.2013.05.173 -
Acetate confidence 1.0
“corresponds to the C-O The band centered at 1029”
Zhang 等 - 2019 - Synthesis of TiB2 Powders with Hexagonal Morpholog DOI: 10.1166/jnn.2019.16750 -
Acetate confidence 1.0
“Other prominent peaks of pure glyccm-1 cm-1 erol include C-O-H around 1414 and the C-O stretch around 1029 [34,35].”
Adam 等 - 2023 - Insight into the Effect of Glycerol on Dielectric DOI: 10.3390/molecules28083461 -
Acetate confidence 1.0
“𝐼 Meanwhile, the C-O-C stretching vibrational modes were (arbitrary units) is the maximum intensity of where 110 1029cm-1 20∘ 2𝜃 = found at 1064 and”
Anusha 和 Fleming - 2016 - Synthesis and Characterization of Chitosan Nanoagg DOI: 10.1155/2016/5379424 -
Amide confidence 1.0
“This may due to the small particle cm-1 amines, whereas the band at 1029 represents C-N of size of graphite powder.”
Basha 等 - 2016 - Effect of ultra graphite application on morphologi DOI: 10.18520/cs/v111/i12/2031-2035 -
Acetate confidence 1.0
“1029 cm-1 represented C-O-H stretching.”
Boubezari 等 - 2020 - Laccase-Based Biosensor Encapsulated in a Galactom DOI: 10.3390/bios10060070
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