What absorbs at 2360 cm⁻¹ in an FTIR spectrum?
A band near 2360 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 2360 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 |
|---|---|---|---|
| Carbon dioxide | 8 | 8 | 1.0 |
| Hydroxyl (O-H) | 8 | 7 | 1.0 |
| N h | 8 | 7 | 1.0 |
| Carboxyl (COOH) | 6 | 6 | 1.0 |
| Alkyl C-H | 6 | 5 | 1.0 |
| Methacrylate | 5 | 5 | 1.0 |
| Acetate | 5 | 5 | 1.0 |
| Carbonyl (C=O) | 5 | 4 | 1.0 |
| Amide | 4 | 4 | 1.0 |
| Aromatic ring | 3 | 3 | 1.0 |
| Ketone | 3 | 3 | 1.0 |
| Ester | 3 | 3 | 1.0 |
| C-O single bond | 3 | 2 | 1.0 |
| Methoxy (OCH3) | 2 | 2 | 1.0 |
| Thiol | 2 | 1 | 1.0 |
| N c o | 1 | 1 | 1.0 |
| Isocyanate | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| N-O bond | 1 | 1 | 1.0 |
| Amino acid | 1 | 1 | 1.0 |
| C#c | 1 | 1 | 0.8 |
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 |
|---|---|---|---|
| SiO | 2360, 800, 1745 | Hydroxyl (O-H) | 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 2360 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
-
Thiol confidence 1.0
“The medium doublet bands around 2360 revealed the typical S-H stretching of L-cysteine amino acid, which suggested the possible”
Mesoporous magnetite nanoparticles synthesis using the Peltophorum pterocarpum pod extract, their antibacterial efficacy against pathogens and ability to remove a pollutant dye DOI: 10.1016/j.molstruc.2018.10.042 -
Acetate confidence 1.0
“cm-1 few absorption peaks around 2360 1483 1359 and 1315 which could CEPTE 32be due to organic/inorganic impurities like C=O, CO and -NO [23].”
Structural and optical investigations of Nd3+doped Y2O3-SiO2 nanopowder DOI: 10.1016/j.jallcom.2017.09.269 -
Carbonyl (C=O) confidence 1.0
“Absorbance peaks at 2360 suggest the ΔT reduction in after addition of SWCNT to UHM(cid:2) presence of an O=C=O asymmetric stretch [37].”
Khan 等 - 2015 - Morphological characteristics of solution spun nan DOI: 10.1134/S0965545X15060115 -
Silicon (Si) confidence 1.0
“and 2360 These peaks can be attributed to the wagging mode of B-H bond, to the stretching mode of Si-B and to the stretching mode B-H bonds respectively [8].”
Seba 等 - 2009 - Correlation between physicochemical and electrical DOI: 10.4028/www.scientific.net/MSF.609.129 -
Water (H2O) confidence 1.0
“A sharp peak at 2360 could be attributed to H(cid:1)(cid:1)O(cid:1)(cid:1)H deformation vibration of group associated with weakly bond water molecules [41].”
Role of iron in the enhanced reactivity of pulverized Red mud: Analysis by Mssbauer spectroscopy and FTIR spectroscopy DOI: 10.1016/j.cscm.2019.e00266 -
Hydroxyl (O-H) confidence 1.0
“3454 and 2 cm-1 cm-1 2360 revealed O-H stretching;”
Vidhya 等 - 2020 - Energy storage performance of CoNiSe2 nanostructur DOI: 10.1016/j.matlet.2020.128485 -
Hydrogen bond confidence 1.0
“The peak shifting from 2360 1090 cm(cid:0) 1 -OH to 2358 is corresponds to hydrogen bond formation between amine groups (betel leaf) and groups (PVA) in composite film.”
Akram 等 - 2023 - Fabrication and characterization of antimicrobial DOI: 10.1016/j.heliyon.2023.e17961 -
Acetate confidence 1.0
“O-H 3266 Carboxylic acid Strong stretching C-H 2939 Alkane Medium stretching O=C--O 2360 Carbon dioxide Strong stretching”
Chowdhury 等 - 2023 - Green synthesis and characterization of zirconium DOI: 10.1016/j.heliyon.2022.e12711
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