What absorbs at 2921 cm⁻¹ in an FTIR spectrum?
A band near 2921 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
可能的官能团归属
排名反映了累积的文献证据，而非单一的权威规则。请始终对照您的样品背景进行确认。
这些分配背后的文献
-
Alkyl C-H 置信度 1.0
“Text: 'peak at about 2921 is attributed to asymmetric or symmetric stretching vibrations (C-H) of the methyl (-CH3-) and methylene (-CH2-) groups'”
Grabi 等 - 2021 - Studies of the potential of a native natural bioso DOI: 10.1038/s41598-021-88657-y -
Alkyl C-H 置信度 1.0
“Explicitly stated as C-H deformation band used as reference.”
Nikafshar 和 Nejad - 2022 - Evaluating efficacy of different UV-stabilizersab DOI: 10.1515/hf-2021-0147 -
Alkyl C-H 置信度 1.0
“Explicit assignment in text: '2921 (CH asymmetric stretching vibrations)'”
Peris 等 - 2023 - Roadmap for Postnatal Brain Maturation Changes in DOI: 10.1021/acschemneuro.3c00237 -
Alkyl C-H 置信度 1.0
“Corresponding to C-H stretching vibrations.”
Varela-Fernandez 等 - 2022 - Design, optimization, and in vitro characterizatio DOI: 10.1016/j.ijpharm.2022.121504 -
Methyl 置信度 1.0
“Explicit assignment: 'peaks at 2921 and 2851 were attributed to C-H stretching vibration of -CH3'.”
Zhang 等 - 2020 - Superhydrophobic Polypyrrole-Coated Cigarette Filt DOI: 10.3390/app10061985 -
Alkyl C-H 置信度 0.9
“Corresponds to methylene groups.”
Calabro 等 - 2013 - 50 Hz Electromagnetic Field Produced Changes in FT DOI: 10.1155/2013/414393 -
Alkyl C-H 置信度 0.9
“Explicit assignment: '2921 for ... asymmetric CH2 stretching'”
Hastati 等 - 2021 - Enhanced Hydrophobicity of Nanofibrillated Cellulo DOI: 10.1007/s12649-021-01366-5 -
置信度 0.9
“Confirms layering of C18 on silica encapsulated nanoparticle”
Nair 等 - 2015 - High yield, facile aqueous synthesis and character DOI: 10.1088/2053-1591/2/4/045014
是否有此波段的光谱？
上传您的FTIR光谱，几秒钟内即可获得完整的解读报告——包含带文献引用的峰分配、库匹配和带有置信度评级的证据链。
解读我的光谱