What absorbs at 2957 cm⁻¹ in an FTIR spectrum?
A band near 2957 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
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
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confidence 1.0
“attributed to asymmetric elongation”
Fernández 等 - 2017 - DOI: 10.17230/ingciencia.13.25.6 -
Alkyl C-H confidence 1.0
“Explicitly assigned to C-H stretching.”
Ghaforinejad 等 - 2021 - Molecular separation of ions from aqueous solution DOI: 10.1038/s41598-021-89371-5 -
Alkyl C-H confidence 0.9
“explicit assignment in text”
Al-Deyab 等 - 2010 - Synthesis and Characterization of Organotin Contai DOI: 10.3390/molecules15031784 -
confidence 0.9
“Explicit assignment”
Durak 等 - 2021 - Changes in Chemical Composition and Accumulation o DOI: 10.3390/ijms22020511 -
confidence 0.9
“Assigned to CH sp3.”
Guimaraes Silva 等 - 2018 - PET glycolysis optimization using ionic liquid [Bm DOI: 10.1590/0104-1428.00418 -
Alkyl C-H confidence 0.9
“Peak assigned to asymmetric CH stretching.”
Spalding 等 - 2018 - Enabling quantification of protein concentration i DOI: 10.1039/C5CS00585J. -
Alkyl C-H confidence 0.9
“Explicit assignment in text”
Thur 等 - 2019 - Bipyridine-based UiO-67 as novel filler in mixed-m DOI: 10.1016/j.progpolymsci.2008.12.004. -
Methyl confidence 0.9
“strain and vibration of CH3 group”
Widjaja 等 - 2023 - Poly lactic acid production using the ring opening DOI: 10.1016/j.heliyon.2023.e17985
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