What absorbs at 3199 cm⁻¹ in an FTIR spectrum?
A band near 3199 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 3 cited sources
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| N h | 3 | 3 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Thiol | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Thiol confidence 1.0
“The FTIR spectrum revealed two adsorption peaks at 3442 and 3199 cm-1, which linked to the characteristic bands of S-H and N-H groups, whereas Figure 5c demonstrates characteristic malachite surface NH2, C-H, C=O, C-O-C and C-S peaks at app”
Ibrahim 等 - 2022 - Effect of Ammonium Sulfide on Sulfidization Flotat DOI: 10.3390/min12101193 -
Carboxyl (COOH) confidence 1.0
“C-O-H (bending)/C-O 1248 (stretching), alcohol, ester, ether, carboxylic acid 5 3322 NH (symmetric/asymmetric stretching) 2 O-H (stretching)/-CH 3199 (antisymmetric stretching) 2”
Hayyan 等 - 2015 - Functionalization of graphene using deep eutectic DOI: 10.1186/s11671-015-1004-2 -
N h confidence 1.0
“In addition, the acti2 cm-1 ± peaks at 3199 and 3081 corresponding to the stretching vation energy of dehydration process was about 218 11 kJ/ NH of 3-carboxymethyl-6-benzyl-2,5-diketopiperazine (DKP) mol determined by TGA method.”
Non-isothermal dehydration kinetic study of aspartame hemihydrate using DSC, TGA and DSC-FTIR microspectroscopy DOI: 10.1016/j.ajps.2017.12.001
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