What absorbs at 2200 cm⁻¹ in an FTIR spectrum?
A band near 2200 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
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| N h | 3 | 3 | 0.9 |
| C n single bond | 3 | 2 | 0.9 |
| Hydroxyl (O-H) | 2 | 2 | 0.9 |
| Nitrile | 2 | 2 | 0.9 |
| Silicon hydride | 1 | 1 | 0.9 |
| C=n | 1 | 1 | 0.8 |
| C#c | 1 | 1 | 0.8 |
| Water (H2O) | 1 | 1 | 0.7 |
| Alkyl C-H | 1 | 1 | 0.7 |
| Adsorbed carbon monoxide | 1 | 0 | 0.8 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Hydroxyl (O-H) confidence 0.9
“Stretching vibration of OH and N-H group”
Eddya 等 - 2020 - A comparison of chitosan properties after extracti DOI: 10.1016/j.heliyon.2020.e03486 -
confidence 0.9
“Explicit assignment: 'Ni2+- of species (2200 and 2214'”
Penkova 等 - 2007 - Effect of the preparation method on the state of n DOI: 10.1021/jp071927p -
Silicon hydride confidence 0.9
“Explicitly labeled as Si-H peak.”
Spee 等 - 2011 - Low Temperature Silicon Nitride by Hot Wire Chemic DOI: 10.1166/jnn.2011.5100 -
Nitrile confidence 0.9
“assigned to C≡N nitrile bond”
Wei - 2002 - Formation of hydrogenated carbon nitride films by DOI: 10.1063/1.1518137 -
Hydroxyl (O-H) confidence 0.9
“Text: 'very broad peak from 2200 cm-1 of the OH stretching'”
Hoang 等 - 2022 - Acidolysis of Poly(ethylene terephthalate) Waste U DOI: 10.1021/acsomega.2c06642 -
confidence 0.9
“strong H-Se absorbance band”
Pacheco-Londono 等 - 2019 - Surface Persistence of Trace Level Deposits of Hig DOI: 10.3390/molecules24193494 -
C#c confidence 0.8
“Range 2100-2200 ascribed to C≡C; peak at 2200 within range”
Dinc 等 - 2020 - Characterization of short-length multi-walled carb DOI: 10.1007/s42823-019-00081-5 -
Nitrile confidence 0.8
“Text states 'two peaks (2125 and 2200 cm-1) ... corresponding to C≡N, C=N, C-N bonds'.”
Wu 等 - 2009 - Bonding structure and optical properties of a-CNx DOI: 10.1016/j.vacuum.2009.04.055
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