What absorbs at 2871 cm⁻¹ in an FTIR spectrum?
A band near 2871 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 6 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
-
Alkyl C-H confidence 0.95
“Explicit assignment: -CH2 Group Symmetric Stretching ~2871, -CH Group Symmetric Stretching ~2871”
Faiza 等 - 2022 - Degradation Performance Investigation of Hydrother DOI: 10.3390/polym14061094 -
Alkyl C-H confidence 0.9
“Text states 'absorption bands at 2959 and 2871 and CH2'.”
Gnatyuk 等 - 2018 - 2D-BN nanoparticles as a spectroscopic marker and DOI: 10.1039/c8ra05085f -
Alkyl C-H confidence 0.9
“Text: 'C-H vibrations (near 2936 and 2871)'.”
Ltifi 等 - 2018 - Physicochemical characteristics of organophilic cl DOI: 10.1007/s13201-018-0732-8 -
confidence 0.8
“Characteristic of alkane homologues due to CH2CH functional.”
Elemike 等 - 2017 - Synthesis, crystal structures, quantum chemical st DOI: 10.1016/j.molstruc.2017.06.104 -
Alkyl C-H confidence 0.8
“Text: '2871 for symmetric modes' and 'sp3-C-H constant'.”
Gupta 等 - 2004 - Synthesis of DLC films by electrodeposition techni DOI: 10.1016/j.diamond.2004.02.006 -
Lipid confidence 0.7
“Listed as major peak of lipid region.”
Saladrigas-Manjon 等 - 2020 - Effects of Cannabis Use on the Protein and Lipid P DOI: 10.3390/biom10020329
Have a spectrum with this band?
Upload your FTIR spectrum and get a full interpretation report — peak assignments with literature citations, library matches, and a confidence-rated evidence chain — in seconds.
Interpret my spectrum