What absorbs at 1236 cm⁻¹ in an FTIR spectrum?
A band near 1236 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 |
|---|---|---|---|
| C-O single bond | 4 | 4 | 0.9 |
| Amide | 3 | 3 | 1.0 |
| Carboxyl (COOH) | 2 | 1 | 0.9 |
| Alkyl C-H | 1 | 1 | 0.8 |
| Methyl | 1 | 1 | 0.8 |
| Lignin | 1 | 1 | 0.7 |
| Silicon-oxygen (Si-O) | 1 | 1 | 0.6 |
| Acetate | 1 | 0 | 0.9 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Amide confidence 1.0
“Explicit assignment: '1236 cm-1 (amide III)'”
Li 等 - 2020 - Improving Mildew Resistance of Soy Meal by Nano-Ag DOI: 10.3390/polym12010169 -
confidence 0.95
“Explicit assignment: '1236 cm-1, referente ao ... do éter aromático'”
Fernandes 等 - 2018 - Membranes of polysulfoneclay influence of differ DOI: 10.1590/S1517-707620170001.0317 -
C-O single bond confidence 0.9
“Explicitly stated: 'a peak at 1,236 represented C-O cm-1'.”
Kumar 等 - 2012 - Mycogenic synthesis of silver nanoparticles by the DOI: 10.1007/s11051-012-0860-2 -
Carboxyl (COOH) confidence 0.9
“Attributed to -COO groups of cellulose.”
Carranza-Nunez 等 - 2021 - Physicochemical Characterization of Natural Fibers DOI: 10.1016/j.carbpol.2013.01.074 -
C-O single bond confidence 0.9
“explicit assignment”
Gouvinhas 等 - 2015 - Discrimination and characterisation of extra virgi DOI: 10.1016/j.foodchem.2014.11.037 -
C-O single bond confidence 0.9
“Explicit assignment.”
Lyszczek 等 - 2022 - A Top-Down Approach and Thermal Characterization o DOI: 10.3390/ma15248826 -
confidence 0.9
“Explicit assignment: 'absorption band at 1236 cm is due to the tensile vibrations of the C-O groups of esters and phenols.'”
Naseriyeh 等 - 2022 - Preparation of liposomal hydrogel containing Calen DOI: 10.14715/cmb/2022.68.11.1 -
Amide confidence 0.9
“Explicit assignment: 1317 and 1236 (amide III)”
Uthaiwat 等 - 2021 - Characteristic Evaluation of Gel Formulation Conta DOI: 10.3390/polym13071142
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