What absorbs at 1028 cm⁻¹ in an FTIR spectrum?
A band near 1028 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 1028 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 |
|---|---|---|---|
| C-O single bond | 20 | 20 | 1.0 |
| Methacrylate | 19 | 19 | 1.0 |
| Acetate | 19 | 19 | 1.0 |
| Methoxy (OCH3) | 18 | 18 | 1.0 |
| Hydroxyl (O-H) | 11 | 11 | 1.0 |
| Alkyl C-H | 8 | 7 | 1.0 |
| Carbohydrate | 8 | 7 | 1.0 |
| C c single bond | 5 | 5 | 1.0 |
| Silicon-oxygen (Si-O) | 5 | 4 | 1.0 |
| Amide | 4 | 4 | 1.0 |
| Silicon (Si) | 4 | 4 | 1.0 |
| Carboxyl (COOH) | 3 | 3 | 1.0 |
| Secondary amine | 3 | 3 | 1.0 |
| C n single bond | 3 | 3 | 1.0 |
| Phosphate (PO4) | 3 | 3 | 1.0 |
| Siloxane (Si-O-Si) | 3 | 2 | 1.0 |
| N h | 2 | 2 | 1.0 |
| Ring structure | 2 | 2 | 1.0 |
| Aromatic ring | 2 | 2 | 1.0 |
| Metal oxygen | 2 | 2 | 1.0 |
| C#c | 1 | 1 | 1.0 |
| C-S single bond | 1 | 1 | 1.0 |
| Ammonium | 1 | 1 | 1.0 |
| Phosphorus | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Borate | 1 | 1 | 1.0 |
| S eq o | 1 | 1 | 1.0 |
| Carbon bromine | 1 | 1 | 1.0 |
| Silanol (Si-OH) | 1 | 1 | 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 |
|---|---|---|---|
| TiO2 | 1028, 1700, 1093 | Methacrylate, Acetate, C-O single bond | 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 1028 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
-
confidence 1.0
“The TG/DTG results showed four steps of thermal degradation at 44via the peak at 1028 (cid:1)C 148, 219-309, 331-489 and 629-810 due to the existence of Ti moieties along with a polymer * Corresponding author.”
Insight on the structural aspect of ENR-50/TiO2 hybrid in KOH/C3H8O medium revealed by NMR spectroscopy DOI: 10.1016/j.arabjc.2018.05.003 -
Metal oxygen confidence 1.0
“LLM confirmed rule peak-group candidate”
Dahham 等 - 2018 - Synthesis and structural studies of an epoxidized DOI: 10.1016/j.polymertesting.2017.11.005 -
Silicon (Si) confidence 1.0
“As the viscosity of the precursor sol is increased, in cm-1 The the peaks from the 1028-1057 range, attributed to case of samples IV and V, the influence of the substrate rotaı(Si-OH) bending vibration mode are noticed in the spectra of tio”
Structural and morphological characterization of Pr3+ and Er3+-containing SiO2–P2O5 sol–gel thin films DOI: 10.1016/j.matchemphys.2011.10.031 -
Acetate confidence 1.0
“1): 900-650cm-1 1028cm-1 The region discriminates fuel oil samples from the 1700 and regions, where the C O and S O 780cm-1 stretchingbandsappear,respectively,andthe900-600cm-1 the other products, mainly the intense peak at (charfinacterist”
Fernandez-Varela 等 - 2006 - Monitoring photooxidation of the Prestige's oil sp DOI: 10.1016/j.talanta.2005.10.006 -
Hydroxyl (O-H) confidence 1.0
“FTIR analysis showed C=O-CH 3, C=C, C-O, and O-H peaks at 1028, 1609,”
Jairath 等 - 2023 - In vitro and in vivo evaluation of Prosopis cinera DOI: 10.47836/ifrj.30.2.06 -
Phosphate (PO4) confidence 1.0
“14(3): 359 Li et al By an esterification cross-linking reaction of corn phosphodiester increased from 1.9 to 66.0 %, starch and STMP, the increased strength of the while RDS content decreased from 86.6 to10.9 cm-1 adsorption peak at 1028 wa”
Li 等 - 2015 - Preparation and In vitro Digestibility of Corn Sta DOI: 10.4314/tjpr.v14i3.1 -
Carbon bromine confidence 1.0
“879 881 879 bending C Br aromatic stretch 1028 1029 1031 1041 1028”
A facile synthesis of poly(aniline-co-o-bromoaniline) copolymer: Characterization and application as semiconducting material DOI: 10.1142/S0217979216500089 -
Carbohydrate confidence 1.0
“Also, the bands at 1028 associated with the presence of cm-1 glucose group, as well as intensities in the 1175-1157 region related to the breakdown of”
Naim 等 - 2022 - ATR-FTIR spectroscopy combined with DNA barcoding DOI: 10.1016/j.vibspec.2022.103446
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