What absorbs at 1142 cm⁻¹ in an FTIR spectrum?
A band near 1142 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 8 cited sources
Réponse rapide
A band near 1142 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 |
|---|---|---|---|
| Hydrogen bond | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Acetate | 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 |
|---|---|---|---|
| PVA | 1142, 1660, 2930 | Amide | 2 |
| gelatin | 1142, 1652, 3300 | Amide | 1 |
| zirconia | 1142, 1100, 460 | Phosphate (PO4) | 1 |
| honey | 1142, 2005, 1199 | Amide | 1 |
| chitosan | 1142, 1650, 1655 | Amide | 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 1142 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
“42 43 cm-1 In the spectrum of PMMA, there is a distinct absorption band at 1142 which is due to O-CH 3 44”
Ataei 等 - 2020 - Electrosprayed PMMA microcapsules containing green DOI: 10.1088/1361-665X/ab9754 -
Amide confiance 1,0
“II), and 1328 (amide III) The absorption peaks at 1142 (antisymmetric elongation of II), and 1328 (amide III) cm-1.”
Chitosan/PVA Based Membranes Processed by Gamma Radiation as Scaffolding Materials for Skin Regeneration DOI: 10.3390/membranes11080561 -
confiance 1,0
“Explicit assignment: 'C-N stretching vibrations are shown at 1286 and 1142 cm-1'.”
Liao LePing 等 - 2011 - Preparation and characterization of microcapsule c DOI: 10.1007/s11434-010-4133-0 -
S eq o confiance 1,0
“The consensus is that 1240 and 1142 cm-1 bands arise from νS=O vibrations in chelating cm-1 ν consensus is that 1240 and 1142 bands arise from vibrations in chelating (bridging) bidentate”
Acidity-Reactivity Relationships in Catalytic Esterification over Ammonium Sulfate-Derived Sulfated Zirconia DOI: 10.3390/catal7070204 -
confiance 1,0
“cm-1 cm-1 1591.8 (N-H bending), 1322.5 (R-SO sym2 (a) (c) caffeine physical mixtures at drug/coformer ratios: 1:1, 2:1, cm-1 metric stretching), 1142.1 (S-O stretching) and (e) 1:2, furosemide-caffeine co-crystals at drug/coformer ratios: c”
Principal component and cluster analyses as supporting tools for co-crystals detection DOI: 10.1007/s10973-017-6436-8 -
confiance 1,0
“The intensity of these bands disappear and bands at 880 and 1142 cm-1 show up which corresponds to Fe-S specific the bands is not very high, but their position is clear.”
Synthesis and Characterization of Cu2FeSnS4–Cu2MnSnS4 Solid Solution Microspheres DOI: 10.3390/ma13194440 -
Phosphate (PO4) confiance 1,0
“It PDBA improved the thermal stability of PET/PDBA and reduced the decomposition rate of cm-1 should be noted that a new absorbance peak of P-O-C appeared at 1142 cm-1 in material.”
A High-Phosphorus-Content Polyphosphonate with Combined Phosphorus Structures for Flame Retardant PET DOI: 10.3390/polym15071713 -
Hydrogen bond confiance 1,0
“Nonetheless, the band at 1142 sample gel fraction (GF) related to the formation of PVA crystallites (intraand intermolecular hydrogen bonding between the chains W”
dos Santos 等 - 2020 - Layered cryogels laden with Brazilian honey intend DOI: 10.1590/0104-1428.06820
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