What absorbs at 3634 cm⁻¹ in an FTIR spectrum?
A band near 3634 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 |
| Silicon (Si) | 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 band at 3634 is attributed to the acidic bridging hydroxyl”
Comparative Study of Zeolite L Etching with Ammonium Fluoride and Ammonium Bifluoride Solutions DOI: 10.1002/admi.202000348 -
Hydroxyl (O-H) confidence 1.0
“0.5 CEC 1.0 CEC 1.5 CEC 2.0 CEC -1 Structural OH stretching 3634”
Karaca 等 - 2013 - Investigation of the Orientation of CTA(+) Ions in DOI: 10.1155/2013/274838 -
Hydroxyl (O-H) confidence 1.0
“LLM confirmed rule peak-group candidate”
Structural, optical, and bioimaging characterization of carbon quantum dots solvothermally synthesized from o-phenylenediamine DOI: 10.3762/bjnano.14.17 -
Hydroxyl (O-H) confidence 0.8
“Negative band at 3634 represents formation of strong H-bond or proton release.”
Noguchi - 2008 - FTIR detection of water reactions in the oxygen-ev DOI: 10.1098/rstb.2007.2214
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