What absorbs at 1004 cm⁻¹ in an FTIR spectrum?
A band near 1004 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 1004 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 |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 4 | 2 | 1,0 |
| Silicon (Si) | 3 | 2 | 1,0 |
| Phosphate (PO4) | 2 | 2 | 1,0 |
| Siloxane (Si-O-Si) | 2 | 1 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Protein | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 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 |
| Amino acid | 1 | 1 | 1,0 |
| S eq o | 1 | 0 | 1,0 |
| Sulfonyl | 1 | 0 | 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 |
|---|---|---|---|
| kaolinite | 1004, 3696, 693 | Silicon-oxygen (Si-O), Silicon (Si), Siloxane (Si-O-Si) | 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 1004 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
-
Amino acid confiance 1,0
“LLM confirmed rule peak-group candidate”
Ngarize 等 - 2005 - A comparative study of heat and high pressure indu DOI: 10.1016/j.foodhyd.2004.12.008 -
Silicon (Si) confiance 1,0
“cm-1 cm-1 The moderately strong broad band at 1033 and the strong sharp band at 1004 correlated to the antisymmetric and symmetric stretching modes of Si-O-Si, respectively [20].”
Souissi 等 - 2022 - Synthesis, Thermal Properties and Electrical Condu DOI: 10.21203/rs.3.rs-1294285/v1 -
Phosphate (PO4) confiance 1,0
“Moreover, the evident sharp absorption peak at 1004 is ascribed to the symmetrical stretching of PO 2”
Dai 等 - 2020 - Effects of a Reactive Phosphorus-Sulfur Containing DOI: 10.3390/polym12071441 -
Acetate confiance 1,0
“cm-1 cm-1 cm-1 1256 (amide III vibration modes), 1163 and 1062 (C-O-C bridge stretching), cm-1 cm-1 1004 and 968 (C-O stretching vibration in secondary and primary OH groups).”
Physicochemical Properties and Functional Characteristics of Ecologically Extracted Shrimp Chitosans with Different Organic Acids during Demineralization Step DOI: 10.3390/molecules27238285 -
Silicon (Si) confiance 1,0
“cm-1 appeared at 2921.4 and The band at 1003.5 is assigned to Si-O bond.”
Liu 等 - 2014 - NIR initiated and pH sensitive single-wall carbon DOI: 10.1039/C3TB21362E. -
Hydroxyl (O-H) confiance 1,0
“cm-1 At 1004 attributed to stretching, OH coupled with bending CO of capsule and pneumoniaeCol-S K.”
Evaluation of Chemical Changes in Laboratory-Induced Colistin-Resistant Klebsiella pneumoniae DOI: 10.3390/ijms22137104 -
Ring structure confiance 1,0
“For all cm-1 of the samples, the narrow band near 1004 corresponded to the ring vibration of Phe”
Ex Vivo Vibration Spectroscopic Analysis of Colorectal Polyps for the Early Diagnosis of Colorectal Carcinoma DOI: 10.3390/diagnostics11112048 -
Phosphate (PO4) confiance 1,0
“The 1004 peak representing ferric phosphate still unreacted rust.”
Rust Conversion Performance of Phosphoric Acid-Gallic Acid in Vinyl Chloride Acrylic Emulsion DOI: 10.3390/coatings11020152
Avez-vous un spectre avec cette bande ?
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