What absorbs at 632 cm⁻¹ in an FTIR spectrum?
A band near 632 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
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Hydroxyl (O-H) | 4 | 4 | 0.9 |
| Metal oxygen | 1 | 1 | 0.9 |
| Perchlorate | 1 | 1 | 0.9 |
| Phosphate (PO4) | 1 | 1 | 0.8 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Hydroxyl (O-H) confidence 0.9
“Explicit assignment: bending band”
Geetha 和 Buvaneswari - 2010 - Ammonium hydrogen difluoride induced fluorination DOI: 10.1016/j.materresbull.2010.09.005 -
Hydroxyl (O-H) confidence 0.9
“explicit assignment”
Yuan 等 - 2020 - Investigation of the effect of doped Zn atom to th DOI: 10.1007/s41779-019-00430-7 -
Perchlorate confidence 0.9
“Peak at 632 cm-1 assigned to ClO4-.”
Ak 等 - 2008 - Synthesis, characterization and optoelectrochemica DOI: 10.1016/j.jelechem.2008.04.015 -
Metal oxygen confidence 0.9
“explicit assignment”
Aloufi - 2023 - Green synthesis of strontium-doped tin dioxide (Sr DOI: 10.1515/gps-2022-8116 -
confidence 0.9
“Explicit assignment: 'attributed to isolated BA molecules'.”
Cozzolino 等 - 2023 - Segregation of Benzoic Acid in Polymer Crystalline DOI: 10.3390/polym15010177 -
Hydroxyl (O-H) confidence 0.9
“libration band at 632 cm-1”
Grunenwald 等 - 2014 - Revisiting carbonate quantification in apatite (bi DOI: 10.1016/j.jas.2014.05.004 -
confidence 0.9
“Text: 'The band 632cm-1 corresponds to the Cu-O bond'”
Zhang 等 - 2014 - Investigation of Adsorption Behavior of Cu2O Submi DOI: 10.1155/2014/619239 -
Phosphate (PO4) confidence 0.8
“Corresponds to phosphate.”
Hammood 等 - 2019 - Effect of calcination temperature on characterizat DOI: 10.1007/s42452-019-0396-5
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