What absorbs at 3633 cm⁻¹ in an FTIR spectrum?
A band near 3633 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 4 cited sources
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Hydroxyl (O-H) | 4 | 4 | 1.0 |
| Metal hydroxyl | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Hydroxyl (O-H) confidence 1.0
“The double peaks at 3680 cm-1 and 3633 cm-1 were observed due to the stretching vibration of the hydroxyl group at the surface of HNTs.”
Synthesis and Optimization of Superhydrophilic-Superoleophobic Chitosan–Silica/HNT Nanocomposite Coating for Oil–Water Separation Using Response Surface Methodology DOI: 10.3390/nano12203673 -
Hydroxyl (O-H) confidence 1.0
“LLM confirmed rule peak-group candidate”
Growth, structure, Hirshfeld surface and spectroscopic properties of 2-amino-4-hydroxy-6-methylpyrimidinium-2,3-pyrazinedicorboxylate single crystal DOI: 10.1016/j.molstruc.2017.11.019 -
Hydroxyl (O-H) confidence 1.0
“Most of the SM samcm-1, which are due obvious peaks at 3633, 3525 and 3323 ples are in the form of amorphous carbon, while semi-coke to -OH stretching vibration in alcohols and stretching vibrashows a tendency to graphitize.”
Huang 等 - 2021 - Experimental research on semi-coke for blast furna DOI: 10.1007/s42243-020-00480-3 -
confidence 1.0
“In the control CTAC-MMT, the absorption peak observed at 3633 was attributed to the stretching vibration of Al-Al-OH groups in the octahedral layer.”
Mushtaq 等 - 2020 - Composite of PLA Nanofiber and Hexadecyl Trimethyl DOI: 10.3390/coatings10050484
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