What absorbs at 753 cm⁻¹ in an FTIR spectrum?
A band near 753 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 753 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 | 4 | 4 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| Aromatic ring | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Chlorine | 2 | 2 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1,0 |
| C-S single bond | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Bromine | 1 | 1 | 1,0 |
| Carbon bromine | 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 |
|---|---|---|---|
| PVP | 753, 2983, 1648 | Alkyl C-H, Methacrylate, Acetate | 1 |
| chitosan | 753, 1650, 1655 | Alkyl C-H, Acetate, Methacrylate | 1 |
| HCl | 753, 1708, 1032 | Aromatic ring, Methacrylate, Acetate | 1 |
| montmorillonite | 753, 1637, 523 | Methacrylate, Acetate | 1 |
| nanocomposites | 753, 1717, 1630 | Alkyl C-H, Methacrylate, Acetate | 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 753 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
-
confiance 1,0
“Finally, the band at cm-1 cm-1 cm-1 818 correlates with Si-O stretching, at 753 to Al-O-Si, at 699 to Si-O, and cm-1 at 616 to the coupled Al-O and Si-O [35].”
Caliman 等 - 2023 - Gellan Gum-Montmorillonite Nanocomposites for Elec DOI: 10.3390/coatings13020350 -
Acetate confiance 1,0
“cm-1 band observed at 1067.69 cm-1 corresponded to C-O stretching of alcohols, whereas the The absorption bands observed at 752.97 and 574.11 were assigned to C-Cl and C-Br stretching of alkyl halides, respectively.”
Facile Green Synthesis of Zinc Oxide Nanoparticles with Potential Synergistic Activity with Common Antifungal Agents against Multidrug-Resistant Candidal Strains DOI: 10.3390/cryst12060774 -
confiance 1,0
“The band corresponds to asymmetric 1562 semiquinonoid structures [2, 11] 2927cm-1, C-H stretching vibration appear at and the band υ stretching vibrations in quinonoid unit 753cm-1 C�N at is assigned to the vibration of N-H.”
Benahmed 等 - 2018 - Spectroscopic Study of PolyanilineAgCl@Ag Nanocom DOI: 10.1155/2018/7320654 -
Carboxyl (COOH) confiance 1,0
“3 862 VW C-COO stretch - - 753 VW C=O bend - -”
Califano 等 - 2008 - Matrix-assisted pulsed laser evaporation of poly ( DOI: 10.1117/1.2830660(cid:4) -
Aromatic ring confiance 1,0
“The 753 band is assigned to the Ar-H out-of-plane vibration.”
Developing Further Versatility in Benzoxazine Synthesis via Hydrolytic Ring-Opening DOI: 10.3390/polym12030694 -
C c single bond confiance 1,0
“While XPS proved beneficial assignment: ring C-C vibration at 753 cm-1, C-C vibrations at 850 cm-1, C-C ring breathing in analysing the surface composition of each fibrous scaffold, it was difficult to pinpoint at 934 cm-1, C-Cbackbone at 1”
Electrospun Fibres of Chitosan/PVP for the Effective Chemotherapeutic Drug Delivery of 5-Fluorouracil DOI: 10.3390/chemosensors9040070 -
confiance 1,0
“ence of moisture, and at 1120 cm-1 longitudinal Si-O stretching, between 1000 cm-1 and 1030 cm-1 Si-O stretching due to the presence of quartz, O-H folding at 911 cm-1 from internal hydroxyl, Si-O folding at 753 cm-1, perpendicular stretchi”
Development of an Epoxy Matrix Hybrid Composite with Astrocaryum Aculeatum (Tucumã) Endocarp and Kaolin from the Amazonas State in Brazil DOI: 10.3390/polym15112532 -
Alkyl C-H confiance 1,0
“In the spectrum of ZnMOF-BTA, metallic-oxygen bands are observed at 435 cm-1 and 463 cm-1 and are assigned to stretching vibrations of Zn-O bonds in the MOF [32], and bands observed at 745 cm-1 and 753 cm-1 correspond to the characteristic”
Synthesis, Characterization and Investigation of Anticorrosion Properties of an Innovative Metal–Organic Framework, ZnMOF-BTA, on Carbon Steel in HCl Solution DOI: 10.3390/coatings12091288
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