What absorbs at 1879 cm⁻¹ in an FTIR spectrum?
A band near 1879 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 2 cited sources
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 0.8 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Alkene (C=C) confidence 1.0
“LLM confirmed rule peak-group candidate”
Liu 等 - 2016 - Thermal degradation properties of biobased iron al DOI: 10.1007/s10853-015-9435-9. -
confidence 1.0
“The incorporation of borate in the support (containing silica, alumina, and zeolite) Catalysts2020,10,1327 5of11 caused slight decrease in the Si-O-Si overtone signals at 2005 and 1879 cm-1, which indicates some”
Development of FTIR Spectroscopy Methodology for Characterization of Boron Species in FCC Catalysts DOI: 10.3390/catal10111327
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