What absorbs at 1258 cm⁻¹ in an FTIR spectrum?
A band near 1258 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 1258 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 |
|---|---|---|---|
| Alkyl C-H | 6 | 6 | 1,0 |
| C-O single bond | 4 | 4 | 1,0 |
| Methacrylate | 4 | 4 | 1,0 |
| Amide | 4 | 4 | 1,0 |
| Acetate | 4 | 4 | 1,0 |
| Hydroxyl (O-H) | 4 | 4 | 1,0 |
| Silicon carbon | 3 | 3 | 1,0 |
| Secondary amine | 3 | 3 | 1,0 |
| Methoxy (OCH3) | 3 | 3 | 1,0 |
| Silicon (Si) | 2 | 2 | 1,0 |
| N h | 2 | 2 | 1,0 |
| C n single bond | 2 | 2 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Phosphate (PO4) | 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 |
|---|---|---|---|
| PET | 1258, 1408, 800 | Methacrylate, Alkyl C-H, C-O single bond | 1 |
| Polystyrene | 1258, 1020, 1600 | Alkyl C-H, Methacrylate, Amide | 1 |
| Polyethylene | 1258, 1737, 1720 | Alkyl C-H, Methacrylate, C-O single bond | 1 |
| collagen | 1258, 1408, 1660 | Amide, Methacrylate, Alkyl C-H | 1 |
| hydroxyapatite | 1258, 1620, 1639 | Alkyl C-H, Methacrylate, 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 1258 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
-
Hydroxyl (O-H) confiance 1,0
“1 showed the overall pattern of both spectra which indi1265cm(cid:3)1 cm(cid:3)1 addition, peaks around and 1258 were attributed cated the basis absorption of mid infrared for the raw material of C@O to bond of flavonoids, steroidal and tri”
Chen 等 - 2014 - Determination of chemical changes in Isatis indigo DOI: 10.1016/j.saa.2014.01.048 -
C c single bond confiance 1,0
“1074 stretching 1113 C-H wagging at benzoic ring C-N stretching in imidazole ring and C-C stretching between 1258”
Degradation of Losartan Potassium Highlighted by Correlated Studies of Photoluminescence, Infrared Absorption Spectroscopy and Dielectric Spectroscopy DOI: 10.3390/pharmaceutics14112419 -
Alkyl C-H confiance 1,0
“The comparison purpose , all the FTIR spectra in DHOA system was spectra of pure TBP in MeOH and ACN showed the phosphoryl cm-1, normalized with C-H bending at 1376 which do not shift cm-1, peak at 1258±1 which appeared very close to the ba”
Verma 等 - 2018 - Structural investigations on uranium(VI) and thori DOI: 10.1039/C7NJ04460G. -
Silicon carbon confiance 1,0
“and Si-CH deformation band at 1258 Similarly the intensity of those bands”
Thermal and surface properties of hybrid materials obtained from epoxy-functional urethane and siloxane DOI: 10.1007/s00289-015-1545-7 -
Amide confiance 1,0
“X-ray scatis cm(cid:2)1 C-N bending vibration, the band centered at 1258 to the tering measurements suggest the self-assembling of disordered article cm(cid:2)1 C-O stretching vibration and the sharp band at 1077 to the Article.”
Design of a fluorescent and clickable Ag38(SRN3)24 nanocluster platform: synthesis, modeling and self-assembling DOI: 10.1039/d1na00090j -
Acetate confiance 1,0
“Comparative ATR/FTIR spectra recorded for (a) V1 modified with different metal fillers and (b) V2 modified with different metal fillers However, it should be noted that the addition of metal powders leads to a general change in the shape cm”
Caramitu 等 - 2022 - Physico-chemical Characterization of Paint Films w DOI: 10.37358/Mat.Plast.1964 -
N h confiance 1,0
“1258 This absorption band appears due to CC and CN stretching, NH bending and CH bending vibrations, but also OH deformation and CO stretching vibration interactions.”
Spectroscopic Investigations of Porphyrin-TiO2 Nanoparticles Complexes DOI: 10.3390/molecules28010318 -
Amide confiance 1,0
“cm-1 ν(CN) δ(NH) The vibrations at 1258 correspond to amide III, and are attributed to and from the”
Drobota 等 - 2020 - Preparation and Characterization of Electrospun Co DOI: 10.3390/ma13183961
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