What absorbs at 758 cm⁻¹ in an FTIR spectrum?
A band near 758 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 758 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 |
| Aromatic ring | 2 | 2 | 1,0 |
| Oxygen heterocycle | 2 | 2 | 0,9 |
| Amide | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Fluorine (C-F) | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| C-S single bond | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Silicon carbon | 1 | 0 | 0,7 |
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 |
|---|---|---|---|
| polyvinylpyrrolidone | 758, 1660, 1700 | Amide, Alkyl C-H | 1 |
| PVP | 758, 2983, 1648 | Alkyl C-H, Amide | 1 |
| ZnO nanoparticles | 758, 1219, 1726 | Alkyl C-H, 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 758 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
“Out of plane symmetric deformation in NO and out of plane bending in C-H vibrations are 2 cm-1, observed at 758 and 829, 853 respectively, in IR spectra.”
Dalal 等 - 2015 - Structural, electrical, ferroelectric and mechanic DOI: 10.1039/C5RA10501C. -
Acetate confiance 1,0
“The peak at 758 can be attributed to the C-O bond stretching.”
Khan 等 - 2016 - Sol-gel synthesis of thorn-like ZnO nanoparticles DOI: 10.1038/srep27689 -
C-S single bond confiance 1,0
“1,091 and 1,051 The absorption bands around 758 cm-1 and 653 observed in the FTIR spectra of the monomer C-S and polymer are characteristic of stretching mode of A B Fig.”
Raj 等 - 2010 - Synthesis and characterization of novel nano-size DOI: 10.1007/s11581-009-0328-2 -
Hydroxyl (O-H) confiance 1,0
“However, the large deviation of experimental C-H and O-H stretching 758cm-1 vibrations with the DFT peaks as shown in Figure 3 has been peak, which is clearly marked with its value in addressed by Ullah et al.”
Ullah 等 - 2016 - Fourier Transform Infrared Spectroscopy of Bisphe DOI: 10.1155/2016/2073613 -
Aromatic ring confiance 1,0
“Inordertomakeaconvenientdiscussion,thewholespectrumis CeH 1e2vinyl olefinic 910 bending vibration groups CeH CeHbending divided into three parts: the hydroxyl and stretching region 758 Aromatic vibration Phenylgroups cm(cid:1)1),”
Thermal ageing behavior of styrene-butadiene random copolymer: A study on the ageing mechanism and relaxation properties DOI: 10.1016/j.polymdegradstab.2012.06.015 -
Alkyl C-H confiance 1,0
“N c h The FTIR spectra of complex A showed an absorption i k c l h c g cm-1 c band at 758 corresponding to adjacent H atom of c g”
Aiad 等 - 2012 - Synthesis and Biocidal Activity of Some Naphthalen DOI: 10.1007/s11743-011-1286-z -
Aromatic ring confiance 1,0
“The peak at 757.67 indicates to the existence of aromatic ring alkanes.”
Pyrolysis of Solid Waste for Bio-Oil and Char Production in Refugees’ Camp: A Case Study DOI: 10.3390/en14133861 -
C c single bond confiance 1,0
“The peak at 758 800 (cid:3)C for all the PVP amount exhibit and also is assigned to the C-C”
Alibe 等 - 2019 - Effects of polyvinylpyrrolidone on structural and DOI: 10.1007/s10973-018-7874-7
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