What absorbs at 2345 cm⁻¹ in an FTIR spectrum?
A band near 2345 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 |
|---|---|---|---|
| Carbon dioxide | 2 | 1 | 0.95 |
| C-O single bond | 1 | 1 | 0.95 |
| Nitrile | 1 | 1 | 0.8 |
| C#c | 1 | 1 | 0.8 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Carbon dioxide confidence 0.95
“Explicit assignment: 'absorption at 2345 due to CO2'”
Marie 等 - 2012 - PEM Anchorage on Titanium Using Catechol Grafting DOI: 10.1371/journal.pone.0050326 -
C-O single bond confidence 0.95
“Explicitly assigned in text: 'the band in 2345 with the ν(CO) stretching mode'”
Sandrini 等 - 2018 - Mechanistic aspects of glycerol electrooxidation o DOI: 10.1016/j.elecom.2017.11.027 -
C#c confidence 0.8
“Peak at 2345 corresponds to triple bond stretching (C≡C or C≡N).”
Mohan 等 - 2018 - Biochar production and applications in soil fertil DOI: 10.1039/c7ra10353k -
confidence 0.7
“Explicit assignment: asymmet- 2 for physisorbed CO.”
Brink 等 - 2015 - Developmental and evolutionary novelty in the serr DOI: 10.1038/srep12338
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