What absorbs at 3623 cm⁻¹ in an FTIR spectrum?
A band near 3623 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 |
|---|---|---|---|
| Hydroxyl (O-H) | 8 | 6 | 1.0 |
| Metal hydroxyl | 2 | 2 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| N h | 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
“cm-1 cm-1 The sharp peaks at 3623.22 and 3702.31 were ascribed to the inner surface N-H stretching and inner hydroxyl group with higher amount of Al-OH in the octahedral sheet, respectively.”
Preparation and characterization of adsorbents derived from bentonite and kaolin clays DOI: 10.1007/s13201-018-0827-2 -
Hydroxyl (O-H) confidence 1.0
“In the 1), FTIR spectrum of the halloysite clay mineral sample (spectrum the peaks at 3698 and cm-1 3623 were due to the stretching vibrations of the OH groups of the Al-OH.”
Enhancing the Thermal Stability of Ionogels: Synthesis and Properties of Triple Ionic Liquid/Halloysite/MCC Ionogels DOI: 10.3390/molecules26206198 -
Hydrogen bond confidence 1.0
“Comparing the hydrogen bonding carboxylic acid O-H stretching appeared spectrum of the nanocomposite with the spectrum of the 3623cm-1.”
Alkurdi 等 - 2022 - Development and Evaluation of a Novel Polymer Drug DOI: 10.1155/2022/7903310 -
Hydroxyl (O-H) confidence 1.0
“3697 O-H stretching 3623 O-H stretching 3440 O-H stretching, hydration”
Caccamo 等 - 2020 - Self-Assembly Processes in Hydrated Montmorillonit DOI: 10.3390/ma13051100 -
Hydroxyl (O-H) confidence 1.0
“The stretching cm-1 region shows the typically broad band at 3623 assigned to the vibrations of the region shows the typically broad band at 3623 cm-1 assigned to the vibrations of the OH”
The Antimicrobial Properties of Modified Pharmaceutical Bentonite with Zinc and Copper DOI: 10.3390/pharmaceutics13081190 -
Hydroxyl (O-H) confidence 0.9
“Explicit assignment: 'υOH at 3623 cm-1'”
The Influence of Long-Time Storage on the Structure and Properties of Multi-Block Thermoplastic Polyurethanes Based on Poly(butylene adipate) Diol and Polycaprolactone Diol DOI: 10.3390/ma16020818
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