What absorbs at 2904 cm⁻¹ in an FTIR spectrum?
A band near 2904 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 7 cited sources
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Alkyl C-H 신뢰도 0.9
“Text: '2904cm-1 C-H Diffraction was due to stretching of CH or CH2 groups.'”
Almahamid 等 - 2022 - Application of Factorial Design and Response Surfa DOI: 10.1155/2022/1967606 -
Alkyl C-H 신뢰도 0.9
“Explicit assignment: 'bands at 2914 and 2904 are attributed to the C-H stretch of the methylene groups'”
Kalmodia 等 - 2015 - Attenuated Total Reflectance Fourier Transform Inf DOI: 10.1038/srep16649 -
Alkyl C-H 신뢰도 0.9
“Explicit assignment in text: 'stretch at 2904 is marked for asymmetric ν str(-CH2-)'”
Wertz 等 - 2018 - Characterisation of oil and aluminium complex on r DOI: 10.1016/j.saa.2018.05.109) -
신뢰도 0.8
“Text: 'cmK1 are assigned to stretching of the at 2904 and 2891 The decomposition measurements were obtained between C-H bond in methylene groups'”
Toledano-Thompson 等 - 2005 - Characterization of henequen cellulose microfibers DOI: 10.1016/j.carbpol.2005.06.024 -
신뢰도 0.8
“Assigned to antisymmetric stretching.”
Piliego 等 - 2013 - 5.2% efficient PbS nanocrystal Schottky solar cell DOI: 10.1039/c3ee41479e -
Methyl 신뢰도 0.8
“assigned to stretching groups of Si-O-Si”
Sonmez 等 - 2018 - IDENTIFYING THE OPTIMUM METHOD FOR MODIFYING THE Z DOI: 10.1016/j.apcata.2012.03.037. -
Alkyl C-H 신뢰도 0.7
“Text: 'bands at 2904 and 2940 are assigned to aliphatic C-O-C group existing in 1057 cm-1 cellulose whereas band at 1130 arises from the stretching vibrations of C-O bonds in ether.' Note: 2904 and 2940 are assigned to -CH groups, but the text is ambiguous; however, the snippet mentions 'aliphatic C-O-C' but the peaks 2904/2940 are typically C-H stretches. The assignment is taken as given.”
Arabyarmohammadi 等 - 2018 - Simultaneous immobilization of heavy metals in soi DOI: 10.1007/s40201-018-0294-6
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