What absorbs at 1789 cm⁻¹ in an FTIR spectrum?
A band near 1789 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 |
|---|---|---|---|
| Methacrylate | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Fatty acid | 1 | 1 | 1.0 |
| Anhydride | 1 | 1 | 0.9 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Fatty acid confidence 1.0
“The region between 1789 cm-1 cm-1 341 and 1263 is a mixed region containing vibrational bands of fatty acids, proteins and”
Rheological, micro-structural and sensorial properties of camel milk yogurt as influenced by gelatin DOI: 10.1016/j.lwt.2018.09.008 -
Carbohydrate confidence 1.0
“The absorption band of 1789 has been assigned to the galactosyl carbohydrate residues.”
Egyptian Opuntia ficus-indica (OFI) Residues: Recovery and Characterization of Fresh Mucilage from Cladodes DOI: 10.3390/horticulturae9070736 -
Anhydride confidence 0.9
“Text states 'newly formed anhydride peaks at 1859 and 1789 cm-l'.”
Ha 等 - 2001 - Spectroscopic stuides on the liquid crystal alignm DOI: 10.1080/10587250108028259
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