What absorbs at 1191 cm⁻¹ in an FTIR spectrum?
A band near 1191 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 |
|---|---|---|---|
| C c single bond | 2 | 1 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| S eq o | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Methoxy (OCH3) | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| C-O single bond | 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
-
C c single bond confidence 1.0
“C-C-Cinplanebend 102 1153.454 1114.2 23.5 CHinplanebend 163 366.7925 354.3 26.7 C-C-Cinplanebend 103 1146.305 1107.3 48.5 CNstretching 1222.3 164 357.1741 345.0 36.5 C-C-Cinplanebend 104 1137.087 1098.4 579.3 CNstretching 1191 165 352.9152”
Computational and spectral studies of 3,3'-(propane-1,3-diyl)bis(7,8-dimethoxy-1,3,4,5-tetrahydro-2H-benzo[d]azepin-2-one) DOI: 10.1016/j.heliyon.2019.e02420 -
Acetate confidence 1.0
“Specifically, the intensity of absorption at 1205 cm-1 (δC-O-H, aromatic ring) and 1191 cm-1 (νC-O, glycosidic bond) decreased in the DAU:POSS complex.”
Piorecka 等 - 2020 - Hydrophilic Polyhedral Oligomeric Silsesquioxane, DOI: 10.3390/ma13235512 -
S eq o confidence 1.0
“The cm-1 absorption peak at 1191 was assigned to the S=O asymmetric vibration peak of -SO 3H groups [46].”
Preparation of a Cation Exchange Membrane by a Sol-Gel Method-Based Polyvinyl Alcohol to Improve Alkali Recovery via Diffusion Dialysis in the Textile Industry DOI: 10.3390/separations10070370 -
confidence 0.7
“Spectral structural carbohydrates peak area”
de Oliveira 和 Yu - 2023 - Quantitation of relationship and development of nu DOI: 10.5713/ab.22.0076
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