What absorbs at 1075 cm⁻¹ in an FTIR spectrum?
A band near 1075 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 1075 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 |
|---|---|---|---|
| Methoxy (OCH3) | 15 | 14 | 1.0 |
| Methacrylate | 15 | 14 | 1.0 |
| Acetate | 15 | 14 | 1.0 |
| C-O single bond | 15 | 14 | 1.0 |
| Silicon-oxygen (Si-O) | 12 | 12 | 1.0 |
| Silicon (Si) | 6 | 6 | 1.0 |
| Phosphate (PO4) | 5 | 5 | 1.0 |
| Hydroxyl (O-H) | 5 | 5 | 1.0 |
| Siloxane (Si-O-Si) | 5 | 5 | 1.0 |
| Alkyl C-H | 3 | 3 | 1.0 |
| Amide | 3 | 3 | 1.0 |
| Methyl | 2 | 2 | 1.0 |
| Secondary amine | 2 | 2 | 1.0 |
| C n single bond | 2 | 2 | 1.0 |
| N-O bond | 2 | 2 | 1.0 |
| Sulfate (SO4) | 2 | 2 | 1.0 |
| Carbohydrate | 2 | 2 | 1.0 |
| Phosphorus | 2 | 2 | 1.0 |
| C c single bond | 2 | 2 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Sulfur | 1 | 1 | 1.0 |
| Lipid | 1 | 1 | 1.0 |
| Carbonate | 1 | 1 | 1.0 |
| C-S single bond | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Silanol (Si-OH) | 1 | 1 | 1.0 |
| Metal oxygen | 1 | 1 | 1.0 |
| Silicon nitrogen | 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 |
|---|---|---|---|
| starch | 1075, 1650, 1540 | Methacrylate, Acetate, C-O single bond | 1 |
| Chitosan | 1075, 1650, 1655 | Acetate, Methacrylate, C-O single bond | 1 |
| gelatin | 1075, 1652, 3300 | Methacrylate, Acetate, C-O single bond | 1 |
| silver nanoparticles | 1075, 1636, 1631 | 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 1075 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
“The ab1075cm-1 C-O rubber compound before adding curatives was measured by a Rubber sorption peak at is attributed to deformation of "Si-O-CH 3" Process Analyzer (RPA 2000) at 100°C and 0.5Hz frequency with 2CH and the intensity of the peak”
Reactive grafting of 3-octanoylthio-1-propyltriethoxysilane in styrene butadiene rubber_ Characterization and its effect on silica reinforced tire composites DOI: 10.1016/j.polymer.2019.121693 -
Silicon (Si) confidence 1.0
“In the present work, green synthesized silver nanoparticles were covalently immobilized on a glass surface topreventaggregationofnanoparticlesandtoenhancetheirapplicability.Fouriertransforminfrared(FTIR)ofsilvernanoparticle cm-1, cm-1, cm-1”
Development of sustainable and reusable silver nanoparticle-coated glass for the treatment of contaminated water DOI: 10.1007/s11356-019-05647-4 -
confidence 1.0
“10 shows a measurement that was performed ing cm-1 cm-1 the broad band between 1075 and 1175 resolved again after overnight exposure to air of >90% RH of a steel sample with (cid:4) to a asymmetric S O stretching vibration peak triplet.”
Simultaneous in situ Kelvin probe and Raman spectroscopy analysis of electrode potentials and molecular structures at polymer covered salt layers on steel DOI: 10.1016/j.electacta.2012.08.042 -
Acetate confidence 1.0
“The C-O-C 𝑐𝑚-1, stretching vibration appears at 1075.12 while the C-N stretches around 1311.35 𝑐𝑚-1 (Timotius et al., 2022).”
Timotius 等 - 2022 - The Study of Methylene Blue Loading into Chitosan- DOI: 10.14716/ijtech.v13i8.6133 -
confidence 1.0
“FTIR results showed that the reduction of Si-O-Si symmetric stretching vibrations cm-1 at 1075 was due to the use of a high percentage of gelatin.”
The effect of gelatin as pore expander in green synthesis mesoporous silica for methylene blue adsorption DOI: 10.1038/s41598-022-19615-5 -
Acetate confidence 1.0
“A significant decrease is evident cm(cid:0) cm(cid:0) 1, 1 (C-O) (C-O-C) in the bands at 1075 associated with v and 1152 equivalent to v glycosidic.”
Aguirre-Loredo 等 - 2023 - Improvements of thermal and mechanical properties DOI: 10.1016/j.heliyon.2023.e16782 -
Phosphate (PO4) confidence 1.0
“mode is centered at 1232 and the PO symmetric cm-1 2stretching mode PO at 1075 , these results are similar to previously reported results [25].”
Aisha 等 - 2014 - Preparation and characterization of nano liposomes DOI: 10.1155/2011/103039. -
C-O single bond confidence 1.0
“C-O-C stretch TEGDMA 1075 C-OH stretch HEMA 1100/1050”
Determination of Dental Adhesive Composition throughout Solvent Drying and Polymerization Using ATR–FTIR Spectroscopy DOI: 10.3390/polym13223886
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