What absorbs at 1259 cm⁻¹ in an FTIR spectrum?
A band near 1259 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 |
|---|---|---|---|
| Alkyl C-H | 3 | 2 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| S eq o | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
S eq o confidence 1.0
“The author's thanks to Ministry of 1259cm-1 corresponds to S=O bonds.”
Artemisia 等 - 2019 - The Properties of Brown Marine Algae Sargassum tur DOI: 10.14499/indonesianjpharm30iss1pp43 -
Alkyl C-H confidence 1.0
“Results and discussion cm-1 Si\CH at 1259.4 due to CH symmetric stretching of 3, at 3”
Ferreira 等 - 2013 - Surface modification of poly(dimethylsiloxane) by DOI: 10.1016/j.surfcoat.2013.02.035 -
C c single bond confidence 1.0
“LLM confirmed rule peak-group candidate”
Preparation, Characterization and Antibacterial Evaluation of Soy Protein Isolate Biopolymeric Films Loaded with Nalidixic Acid DOI: 10.1007/s10924-020-01729-4 -
Alkyl C-H confidence 1.0
“The characteristic band at 1259 assigned to the CH 2Cl wagging was only present in the spectra of PSVBC-30 but absent in the other spectra [27].”
Anion Exchange Membranes Based on Imidazoline Quaternized Polystyrene Copolymers for Fuel Cell Applications DOI: 10.3390/membranes11110901
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