What absorbs at 2335 cm⁻¹ in an FTIR spectrum?
A band near 2335 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 4 cited sources
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Thiol | 1 | 1 | 1.0 |
| Carbon dioxide | 1 | 1 | 1.0 |
| Urethane | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Acetate confidence 1.0
“However, the three cm-1 peaks appearing in the range between 2270 and 2410 are attributed to urethane groups, while the absorption peak cm-1 at 2335 might be due to C=O stretching (bonded) in cm-1are urethane.”
Analysis of silver nanoparticles produced by chemical reduction of silver salt solution DOI: 10.5755/j01.ms.22.4.12503 -
Carbon dioxide confidence 1.0
“Characteristic cm(cid:1)1 in the carbon dioxide bands at 2335 and 2366 assigned to bands for small (dimeric) and larger water clusters, and bulk- (cid:5)3600, dioxide51 shows that it asymmetric stretching modes of carbon like water are dist”
Ngoc Minh Nguyen Huynh 等 - 2018 - Reduced graphene oxide as a water, carbon dioxide DOI: 10.1039/c8ra03080d -
Thiol confidence 1.0
“cm(cid:2)1 S-H The characteristic bands of at 2335 and 2362 were still γ A method of grafting a mesoporous -alumina layer, supported present with no change in intensity.”
PDMS grafting of mesoporous γ-alumina membranes for nanofiltration of organic solvents DOI: 10.1016/j.memsci.2014.07.010 -
confidence 0.9
“CO absorption band”
Stoichiometric Determination of Moisture in Edible Oils by Mid-FTIR Spectroscopy DOI: 10.1016/j.aca.2016.03.016
Have a spectrum with this band?
Upload your FTIR spectrum and get a full interpretation report — peak assignments with literature citations, library matches, and a confidence-rated evidence chain — in seconds.
Interpret my spectrum