What absorbs at 2887 cm⁻¹ in an FTIR spectrum?

Réponse rapide

A band near 2887 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 2887 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

• Alkyl C-H confiance 1,0

  “cm´1, for the OH group of pure PHB appears between 3200 and 4000 but the broad band of the OH The stretching peaks at 1452, 1379, 1223, and 2887 cm-1 correspond to the methyl group.”

  Influence of Electrospinning Parameters on Fiber Diameter and Mechanical Properties of Poly(3-Hydroxybutyrate) (PHB) and Polyanilines (PANI) Blends DOI: 10.3390/polym8030097
• Carbohydrate confiance 1,0

  “4000 3500 3000 2500 2000 1500 1000 stronger hydrogen bonding could be concluded from the double (cm-1) Wave Number 2919cm-1 2887cm-1 999cm-1 992cm-1 peaks at to and to in nanocomposites samples when compared with pure starch (Ding, Ainswort”

  Glycerol/starch/Na+-montmorillonite nanocomposites: A XRD, FTIR, DSC and 1H NMR study DOI: 10.1016/j.carbpol.2010.10.018
• Alkyl C-H confiance 1,0

  “Instead, the large cm-1 vibration band located at 2887 and corresponding to the C-H stretching from the aliphatic chain showed a decrease in intensity during laser irradiation.”

  Spectroscopic Characterization of Emulsions Generated with a New Laser-Assisted Device DOI: 10.3390/molecules25071729
• Hydroxyl (O-H) confiance 1,0

  “The H-O-H stretching vibrations of a collection of water molecules engaged in crystallization are restretching vibrations of a collection of water molecules engaged in crystallization are stretching vibrations of a collection of water molec”

  Synthesis and Characterization of New Composite Materials Based on Magnesium Phosphate Cement for Fluoride Retention DOI: 10.3390/ma16020718
• Alkyl C-H confiance 0,8

  “Intense spectra in group 2887-2925 attributed to CH2/CH3.”

  Potato Starch Utilization in Ecological Loose-Fill Packaging Materials—Sustainability and Characterization DOI: 10.3390/ma13061390
• Alkyl C-H confiance 0,7

  “Context: C-H stretching at three frequencies.”

  Alghamdi 等 - 2021 - Effects of various media on micellization, adsorpt DOI: 10.1098/rsos.211527