What absorbs at 1082 cm⁻¹ in an FTIR spectrum?
A band near 1082 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 1082 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 |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 12 | 10 | 1.0 |
| C-O single bond | 9 | 8 | 1.0 |
| Methoxy (OCH3) | 7 | 6 | 1.0 |
| Methacrylate | 7 | 6 | 1.0 |
| Acetate | 7 | 6 | 1.0 |
| Alkyl C-H | 7 | 6 | 1.0 |
| Hydroxyl (O-H) | 6 | 6 | 1.0 |
| Nucleic acid | 6 | 6 | 1.0 |
| Silicon (Si) | 6 | 5 | 1.0 |
| Amide | 5 | 5 | 1.0 |
| Phosphate (PO4) | 4 | 4 | 1.0 |
| Carboxyl (COOH) | 3 | 3 | 1.0 |
| Carbohydrate | 3 | 3 | 1.0 |
| Siloxane (Si-O-Si) | 3 | 2 | 1.0 |
| Protein | 2 | 2 | 1.0 |
| Ring structure | 2 | 2 | 1.0 |
| C c single bond | 2 | 2 | 1.0 |
| Secondary amine | 2 | 2 | 1.0 |
| C n single bond | 2 | 2 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Phosphorus | 1 | 1 | 1.0 |
| Phospholipid | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Hydrogen bond | 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 |
|---|---|---|---|
| graphene oxide | 1082, 1150, 3400 | Methacrylate, C-O single bond, Methoxy (OCH3) | 1 |
| polymer | 1082, 1718, 1722 | Methacrylate, C-O single bond, Methoxy (OCH3) | 1 |
| montmorillonite | 1082, 1637, 523 | Silicon-oxygen (Si-O), Methacrylate | 1 |
| silver nanoparticles | 1082, 1636, 1631 | Methacrylate, C-O single bond, 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 1082 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
-
Alkyl C-H confidence 1.0
“The peak at 1082 cm-1 for cm-1 cm-1 1486 of ODA belongs to the C-H bend, and it moves to 1464 in functionalized GO.”
Daud 等 - 2017 - Functionalizing Graphene Oxide with Alkylamine by DOI: 10.3390/nano7060135 -
Hydroxyl (O-H) confidence 1.0
“The peaks at 3850, 3418, 2923, 1540.5, cm-1 and 1081.6 were attributed to O-H stretching of intra molecular hydrogen bonds, C phenolic groups, and C-N stretching vibrations of aliphatic and aromatic amines.”
Divya 等 - 2018 - Biopolymer gelatin-coated zinc oxide nanoparticles DOI: 10.1016/j.jphotobiol.2017.11.008 -
Phosphate (PO4) confidence 1.0
“LLM confirmed rule peak-group candidate”
Erukhimovitch 等 - 2002 - Spectroscopic characterization of human and mouse DOI: 10.1562/0031-8655(2002)076 -
Amide confidence 1.0
“(a), PANI (b), and PANI-GQDs (c) cm-1 1082 are due to C-N stretching of benzenoid and the quinoid unit of PANI, respectively.”
Gebreegziabher 等 - 2020 - Polyaniline-graphene quantum dots (PANI-GQDs) hybr DOI: 10.1007/s42823-019-00064-6 -
Hydroxyl (O-H) confidence 1.0
“2 (1-4)-glucosidic cm-1, the the special broad peak of band in poly saccharide unit at 1150 C-O-C cm-1, the (stretching vibration) in OH group stretching vibration peak at 1082 1060-1015 cm-1, cm-1 and peak at is due to CH-OH in the glucose”
Removal of Hexavalent Chromium by Cross-Linking Chitosan and N,N’-Methylene Bis-Acrylamide DOI: 10.1007/s40710-020-00447-2 -
C c single bond confidence 1.0
“of vibrational bands were at 1594, 1082, and 474 cm-1, The main position band was at 1594 corresponding C-C to the stretching vibration and the peaks were at C-H cm-1, 1082 attributed to the stretching vibration, cm-1, whereas weak peak was”
Logaranjan 等 - 2016 - Shapeand Size-Controlled Synthesis of Silver Nan DOI: 10.1186/s11671-016-1725-x -
confidence 1.0
“The peak assignments are: 1122 (C-C cm21 cm21 stretch), 1115 (C-C stretch), 1100 (Si-O cm21 stretch of clay), 1082 (Si-O stretch of clay and”
Loo 和 Gleason - 2004 - Investigation of polymer and nanoclay orientation DOI: 10.1016/j.polymer.2004.06.025 -
confidence 1.0
“The peaks match very well withtheνSi-O-Sitetracyclicpeak,1082cm-1;thewCH(trans),vinyl, Acknowledgments 1026cm-1;andwCH 2,vinyl,966cm-1,ofatetracyclicsiloxanewith definitive vinyl groups (Wachholz et al., 1995).”
Reactions between organic acids and montmorillonite clay under Earth-forming conditions DOI: 10.1016/j.chemgeo.2010.12.023
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