What absorbs at 905 cm⁻¹ in an FTIR spectrum?
A band near 905 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
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Silicon (Si) | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Oxygen heterocycle | 1 | 1 | 1.0 |
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
“S2 of the supplemented file, and the lattice of S1000 expands compared to S600 and S800, the peak at 905 K is related not to the oxygen absorption into the particle but to the oxygen redistribution from the absorbed oxygen to the”
Control of magnetic properties and band gap by Co/Mn ordering and oxygen distributions of La2CoMnO6 DOI: 10.1016/j.jmmm.2017.03.040 -
Oxygen heterocycle confidence 1.0
“LLM confirmed rule peak-group candidate”
Radzir 等 - 2015 - Effect of lithium bis(trifluoromethylsulfonyl)imid DOI: 10.1007/s10008-015-2910-z -
Alkene (C=C) confidence 1.0
“The band with the maximum at ~905 present in both oil samples cis-substituted can be attributed to the stretching vibrations of olefin groups, which may be additionally enhanced by the vibrations of the vinyl group.”
Comparative Analysis of Phytochemicals and Antioxidant Properties of Borage Oil (Borago officinalis L.) and Milk Thistle (Silybum marianum Gaertn) DOI: 10.3390/app13042560 -
Ring structure confidence 1.0
“The sity at 905 cm-1 related to the α-l-guluronic asymmetric ring vibration can be seen, too [49].”
Microwave Assisted Extraction of Raw Alginate as a Sustainable and Cost-Effective Method to Treat Beach-Accumulated Sargassum Algae DOI: 10.3390/polym15142979 -
Alkyl C-H confidence 1.0
“C-H rock vibration 905”
Trilokesh 和 Uppuluri - 2019 - Isolation and characterization of cellulose nanocr DOI: 10.1038/s41598-019-53412-x -
Silicon (Si) confidence 1.0
“The sharp band at 905 cm-1 was attributed to a Si-H2 scissoring mode, while the broad band at 1030 cm-1 was attributed to Si-O-Si asymmetric bending.”
Controlling and Predicting the Dissolution Kinetics of Thermally Oxidised Mesoporous Silicon Particles: Towards Improved Drug Delivery DOI: 10.3390/pharmaceutics11120634
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