What absorbs at 1139 cm⁻¹ in an FTIR spectrum?

Réponse rapide

A band near 1139 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

Le classement reflète les preuves bibliographiques accumulées, et non une règle faisant autorité. Confirmez toujours dans le contexte de votre échantillon.

Matériaux possibles

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 1139 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

• Acetate confiance 1,0

  “The membrane-vehicle numbers as the proportion of water in the cosolvent increased coefficient partition (K) calculated using eq 4: C-O (Figure 1c) as did the stretching motion of PG at 1139”

  Benaouda 等 - 2012 - Discriminating the Molecular Identity and Function DOI: 10.1021/mp300127f
• C c single bond confiance 1,0

  “Meanwhile, the peaks at around 1139 and cm-1 726 corresponded to C-C-O asymmetric stretching and C-O symmetric stretching, cm-1.”

  Can 等 - 2023 - Choline Chloride-Based Deep Eutectic Solvent-Treat DOI: 10.3390/f14030569
• Carbohydrate confiance 1,0

  “Zoomed in fingerprint region showing carbohydrate specific peaks at carbohydrates (1200 cm-1, cm-1, cm-1 1139cm-1.”

  Dhaulaniya 等 - 2020 - Development of an FTIR based chemometric model for DOI: 10.1080/19440049.2020.1718774
• Acetate confiance 1,0

  “(Figure 2B), which can be assigned to the C=O stretching in aliphatic and aromatic ester 1725 cm-1 (Figure 2B), which can be assigned to the C=O stretching in aliphatic and cm-1 groups, the peak at 1164 (Figure 2C), corresponding to the C-O”

  Cutinase-Catalyzed Polyester-Polyurethane Degradation: Elucidation of the Hydrolysis Mechanism DOI: 10.3390/polym14030411
• Alkyl C-H confiance 1,0

  “The 3 cm-1, cm-1 other bands were observed at 1139 and 990 attributed to the -CH twisting.”

  Carrier mechanism of ZnO nanoparticles-embedded PMMA nanocomposite organic bistable memory device DOI: 10.1016/j.solidstatesciences.2019.106046
• Alkyl C-H confiance 1,0

  “1113cm-1 and1149cm-1 areherebyassignedto1139cm-1 According to DFT calculations, there are 14 C-H stretchand 1164cm-1 ing vibrations in different combinations between 3000 and , respectively, according to Table 1 and relative PED”

  Ullah 等 - 2016 - Fourier Transform Infrared Spectroscopy of Bisphe DOI: 10.1155/2016/2073613
• Silicon (Si) confiance 1,0

  “cm-1 1200-400 The peaks at 1139.24 and 1095.99 are assigned to stretching cm-1 cm-1 vibration of Si-O, the peaks at 1031.25 and 1008.16 are assigned to stretching cm-1 cm-1 vibration of Si(Al)-O, the peaks at 787.56 and 761.71 are assigned”

  Effects and Mechanism of Fe3+ on Flotation Separation of Feldspar and Epidote with Sodium Oleate at Natural pH DOI: 10.3390/separations9050110
• Amide confiance 1,0

  “When comparing in cellulose can be intensity patterns at cm(cid:3)1, 'Days 8-11' with alterations in the protein regions manifests 1054 which displays a reduction over time, and cm(cid:3)1 across all three approaches with the amide III peak”

  Application of vibrational spectroscopy techniques to non-destructively monitor plant health and development DOI: 10.1039/c5ay00377f