What absorbs at 2876 cm⁻¹ in an FTIR spectrum?
A band near 2876 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 5 cited sources
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Alkyl C-H | 3 | 3 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Thiol | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Thiol confidence 1.0
“cm)1 cm)1 cm)1 (CH symmetric stretch), 2646.9 (S-H bands differentiate chocolate (H) and the three stretch), 2875.5 907.9 2 cm)1 cm)1) cm)1 cm)1 (CH scissors), 1395.3 (symmetric region bands (1558.8, 1540.3, and 1507 and stretch), 1457.1 sh”
Elkins - 2011 - Rapid Presumptive Fingerprinting of Body Fluids DOI: 10.1111/j.1556-4029.2011.01870.x -
Alkyl C-H confidence 1.0
“- O-H asymmetric and symmetric stretching 3293 3356 C-H asymmetric and symmetric stretching 2876 2872 2881 2858 2851 2851 vibration”
Sukprasert 等 - 2020 - Synchrotron FTIR Light Reveals Signal Changes of B DOI: 10.1155/2020/6149713 -
Alkyl C-H confidence 1.0
“3 cm-1, 4716 8709 symmetric stretching vibration at 2876 the cm-1, CH symmetric stretching vibration at 2857 4777 9181 2 COOcm-1 the symmetric stretch band at 1391 and”
Wang 等 - 2012 - Differentiation in MALDI-TOF MS and FTIR spectra b DOI: 10.1186/1471-2180-12-182 -
Hydroxyl (O-H) confidence 1.0
“cm-1 cm-1 while 1086.5 stretching peak at 2875.6 cm-1 Differential scanning calorimetry (DSC) peak was for O-H bending and 1343.7 was attributed to C-O stretching (Figure 1 E) [15].”
Anuml 等 - 2021 - Development and characterization of ceftriaxone in DOI: 10.4314/tjpr.v20i4.2 -
Alkyl C-H confidence 1.0
“CH3 Asymmetric stretching 2916 CH2 Asymmetric stretching Polypropylene 2876 CH3 Symmetric stretching”
Modification of surface characteristic and tribo-electric properties of polymers by DBD plasma in atmospheric air DOI: 10.1051/epjap/2017170149
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