What absorbs at 3628 cm⁻¹ in an FTIR spectrum?
A band near 3628 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
Réponse rapide
A band near 3628 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.
Attributions possibles de groupes fonctionnels
| Groupe fonctionnel | Faits à l＇appui | Sources citées | Confiance maximale |
|---|---|---|---|
| Hydroxyl (O-H) | 4 | 3 | 1,0 |
| Water (H2O) | 2 | 2 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Styrene | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
Le classement reflète les preuves bibliographiques accumulées, et non une règle faisant autorité. Confirmez toujours dans le contexte de votre échantillon.
Matériaux possibles
| Matériel | Pics de support | Groupes chevauchants | Sources citées |
|---|---|---|---|
| montmorillonite | 3628, 1637, 523 | Hydroxyl (O-H), Water (H2O) | 1 |
| CMC | 3628, 1423, 1196 | Hydroxyl (O-H), Water (H2O), Secondary amine | 1 |
Les matériaux sont affichés uniquement lorsque le même ensemble de littérature soutient cette bande et au moins un pic caractéristique supplémentaire.
Logique du spectre
This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 3628 cm⁻¹ is usually not enough for material identification by itself.
Utilisation réelle
Ce type de requête est courant dans l＇identification des polymères, le criblage des plastiques inconnus, le dépannage du contrôle qualité, la vérification des matériaux recyclés et l＇examen de l＇attribution des pics appuyée par la littérature.
Erreurs courantes
- Traiter une bande isolée comme preuve d＇un matériau sans vérifier au moins un ou deux pics de support.
- Ignorer le chevauchement : plusieurs groupes fonctionnels peuvent contribuer près du même nombre d＇onde.
- Sauter la validation lorsque des additifs, des mélanges, l＇oxydation ou la contamination peuvent déformer le spectre.
Conseil de vérification
Lorsque l＇ambiguïté persiste, validez l＇hypothèse avec DSC, GC-MS ou TGA, en particulier pour les mélanges, les échantillons dégradés et les polymères chargés.
Bibliographie derrière ces attributions
-
Alkene (C=C) confiance 1,0
“transformation of epoxy group are observed at 1715 cm-1 bending of C-H double bond of vinyl groups, and 910 cm-1 A broad vibration between 3628 and 3142 is associated corresponds to double bonds of styrene monomer.”
Eduardo Correa 等 - 2017 - Influence of tribological test on the global conve DOI: 10.1590/0104-1428.14916 -
Hydroxyl (O-H) confiance 1,0
“All the FTIR 136 spectra have a band at 3628 cm-1, which is attributed to the elongation vibration of the OH 137”
Optimization of the Pentachlorophenol Adsorption by Organo-Clays Based on Response Surface Methodology DOI: 10.3390/ma15207169 -
Water (H2O) confiance 1,0
“The water O-H stretches at 18O 3631cm-1 assign water stretching vibrations, we normally use 3628 and probably correspond to the previously Fukuda et al.: Water vibration of Clpump in water 171 2685cm-1, bonding strength of such water molecu”
Fukuda 等 - 2013 - Detection of a protein-bound water vibration of ha DOI: 10.2142/biophysics.9.167 -
Hydroxyl (O-H) confiance 1,0
“They were found as red-shift peaks due to the difference of surface binding or adsorption strength between the different Pd catalysts since the hydroxyl group vibration of the free hemiaminal is 3628 cm-1, according to DFT calculation at th”
Underlying Mechanisms of Reductive Amination on Pd-Catalysts: The Unique Role of Hydroxyl Group in Generating Sterically Hindered Amine DOI: 10.3390/ijms23147621 -
N h confiance 1,0
“1 3600 Hydroxyl groups of the glucose and the -NH stretching cm-1 The peaks at 3628, 1544, and 1231 in the biomass were reduced and broadened.”
Bonding Behavior and Mechanism of U(VI) by Chemically Modified Deinococcus radiodurans DOI: 10.3390/min11101108 -
Water (H2O) confiance 1,0
“istic absorption band at 3400 cm-1 due to the O-H stretching of adsorbed water and the 2 cm-1 characteristic absorption band at 3400 due to the O-H stretching of adsorbed water shoulder at 3628 cm-1 due to structural -OH groups of MMT.”
Assessing the Carboxymethylcellulose Copper-Montmorillonite Nanocomposite for Controlling the Infection of Erwinia carotovora in Potato (Solanum tuberosum L.) DOI: 10.3390/nano11030802
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