What absorbs at 1092 cm⁻¹ in an FTIR spectrum?
A band near 1092 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 1092 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 |
|---|---|---|---|
| Phosphate (PO4) | 8 | 8 | 1.0 |
| Methoxy (OCH3) | 8 | 7 | 1.0 |
| C-O single bond | 8 | 7 | 1.0 |
| Methacrylate | 7 | 6 | 1.0 |
| Acetate | 7 | 6 | 1.0 |
| Silicon-oxygen (Si-O) | 7 | 4 | 1.0 |
| Hydroxyl (O-H) | 5 | 5 | 1.0 |
| Phosphorus | 4 | 4 | 1.0 |
| Siloxane (Si-O-Si) | 4 | 3 | 1.0 |
| Silicon (Si) | 3 | 2 | 1.0 |
| Carbohydrate | 2 | 2 | 1.0 |
| Carboxyl (COOH) | 2 | 2 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Carbonate | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Methyl | 1 | 1 | 0.9 |
| Aldehyde (CHO) | 1 | 1 | 0.8 |
| Silanol (Si-OH) | 1 | 0 | 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 |
|---|---|---|---|
| CdS | 1092, 1375, 1114 | Methoxy (OCH3), Methacrylate, C-O single bond | 1 |
| lipids | 1092, 1735, 810 | Methacrylate, Methoxy (OCH3), 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 1092 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
“cm-1 462, 670, 805, 938 are identified as characteristics abIntensity α-Si3N4 sorption bands of [9,10] The absorption band at cm-1 corresponds to the Si-O bond-stretching vibra1092 tion [9].”
Chattopadhyay 等 - 2009 - Defects dynamics in annealed Si3N4 by positron ann DOI: 10.1002/pssc.200982077 -
Carbohydrate confidence 1.0
“Also, cm-1 the bands at 1092 and 1031 corresponding to carbohydrate rings of alginate were present.”
Silico-manganese fumes waste encapsulated cryogenic alginate beads for aqueous environment de-colorization DOI: 10.1016/j.jclepro.2019.118867 -
Phosphate (PO4) confidence 1.0
“cm-1 1092 Band positions have also been recorded and some of them have been assigned to HA phosphate vibration”
Lebon 等 - 2008 - Characterization of archaeological burnt bones co DOI: 10.1007/s00216-008-2469-y -
Carbonate confidence 1.0
“The strong factor group analysis of calcite, internal A mode 1, symmetric 1g cm-1 cm-1 ∼1085 Raman band at 1092 corresponding to the case in which all stretch) of the carbonate anion located at is the theCO2groupvibrateinidenticalphase.Thes”
Nagabhushana 等 - 2009 - Swift heavy ion irradiation induced phase transfor DOI: 10.1016/j.ssc.2009.07.049 -
Acetate confidence 1.0
“cm-1,1406 cm-1 cm-1 assigned to C=O GO peaks at 1092 and 1728 with corresponding functional cm-1 cm-1 groups (C-O), (O-H) and (C=O) respectively as well as peaks at 855 and 553 having functional group”
Antibacterial and in vivo toxicological studies of Bi2O3/CuO/GO nanocomposite synthesized via cost effective methods DOI: 10.1038/s41598-022-17332-7 -
Siloxane (Si-O-Si) confidence 1.0
“Moreover, the band around 1092 assoof Si-CH versely related to the square of the characteristic energy ciated with siloxane bonds shifted to lower wavenumbers Qn 29Si (see (1)), which is in turn related to the adsorbent-adsorbate spectra on”
Rios 等 - 2011 - Characterisation of hybrid xerogels synthesised in DOI: 10.1007/s10450-011-9331-9 -
Acetate confidence 1.0
“cm(cid:2)1 was attributed to the another absorption band at 1092 The formation of CdS nanoparticles can be also confirmed by photoluminescence (PL) spectroscopy, because CdS hydroxy C-O stretching band.”
Wang 等 - 2007 - Synthesis and characterization of CdSPVA nanocomp DOI: 10.1016/j.apsusc.2007.04.020 -
Phosphate (PO4) confidence 1.0
“PO2 stretch C = O stretch C-H bend 1172 C-O stretch 1060 COH stretch 1467 1090 C-H bend PO2 stretch 1092”
Prediction of Neonatal Respiratory Distress Biomarker Concentration by Application of Machine Learning to Mid-Infrared Spectra DOI: 10.3390/s22051744
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