What absorbs at 3568 cm⁻¹ in an FTIR spectrum?
A band near 3568 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 5 cited sources
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Hydroxyl (O-H) | 4 | 4 | 1.0 |
| Water (H2O) | 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
“(cm(cid:1)1) Peaks Stretching Functional group 3641.60 OH vibration Hydroxyl group 3568.31 OH Stretching Hydroxyl group”
Spectral characterization of hydroxyapatite extracted from Black Sumatra and Fighting cock bone samples: A comparative analysis DOI: 10.1016/j.sjbs.2020.11.020 -
Hydroxyl (O-H) confidence 1.0
“10 of 17 peaks from 632 and 3568 cm-1 are attributed to the vibrational (υL) and stretching (υs) vi- (OH-) group.”
Physicochemical Characterization of Europium-Doped Hydroxyapatite Thin Films with Antifungal Activity DOI: 10.3390/coatings12030306 -
Water (H2O) confidence 1.0
“It is worth reporting that ∼3568cm-1 weakly bound water molecules (Falini et al., 2002) and/or the broad signal observed at has been previoccurrence of trivalent cations in the serpentine structure ously observed on the spectrum of the refe”
Fritsch 等 - 2021 - Structural, textural, and chemical controls on the DOI: 10.5194/ejm-33-447-2021 -
Hydroxyl (O-H) confidence 1.0
“for 4h and 3568cm-1 300oC Before heating, the hydroxyl band of HAp at heated again at for another 3h for better results.”
Malla 等 - 2020 - Extraction and Characterization of Novel Natural H DOI: 10.1155/2020/1690178 -
Hydroxyl (O-H) confidence 1.0
“However, as no other HPO as a very weak shoulder, with a - were detected in these synthesised materials, the peak at further peak associated with O-H groups observed at 3568 cm-1”
The deposition of strontium and zinc Co-substituted hydroxyapatite coatings DOI: 10.1007/s10856-017-5846-2
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