What absorbs at 671 cm⁻¹ in an FTIR spectrum?
A band near 671 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 671 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 |
|---|---|---|---|
| Metal oxygen | 6 | 6 | 1,0 |
| Alkyl C-H | 3 | 3 | 1,0 |
| Aromatic ring | 2 | 2 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1,0 |
| Silicon (Si) | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Chlorine | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 0,9 |
| Sulfate (SO4) | 1 | 1 | 0,9 |
Le classement reflète les preuves bibliographiques accumulées, et non une règle faisant autorité. Confirmez toujours dans le contexte de votre échantillon.
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 671 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
-
Metal oxygen confiance 1,0
“The Sn-O stretching is observed at 671 for binary zinc tin”
Effect of annealing temperature on optical properties of binary zinc tin oxide nano-composite prepared by sol⠍gel route using simple precursors: Structural and optical studies by DRS, FT-IR, XRD, FESEM investigations DOI: 10.1016/j.saa.2014.08.031 -
Metal oxygen confiance 1,0
“All the cases of spectra that produced 𝐶𝑜 0.5𝑍𝑛 0.5𝐶𝑑 𝑥𝐹𝑒 (2-𝑥)𝑂 cm-1 cm-1), absorption peaks in the fingerprint region (400 -800 which is due to M-O stretching 671 that ensures the presence of ferrites in prepared samples and designates th”
Manimegalai 等 - 2022 - Experimental investigation on ferrofluid propertie DOI: 10.15251/DJNB.2022.172.661 -
Phosphate (PO4) confiance 1,0
“ATD-FTIR spectra of the Salisbury's patina exhibit peaks at 2361, 2341 and 671 cm-1 (assigned to phosphates);”
Martin-Gil 等 - 2005 - The orange-brown patina of Salisbury Cathedral (We DOI: 10.1065/espr2005.05.257 -
Metal oxygen confiance 1,0
“Also in the fingerprint cm-1 region, it has been observed peaks at around 671 and 507 represent vibration of Ag-O metal oxides [22-24].”
Rupiasih 等 - 2019 - The Current-Voltage Properties of ChAgNP Composit DOI: 10.1088/1757-899X/515/1/012064 -
Alkyl C-H confiance 1,0
“cm1 cm1 stretching at 671.43 and 892.51 The peaks at 834.50 and 798.47 indicate C-H”
Agrawal 等 - 2023 - Biotreatment of azo dye containing textile industr DOI: 10.21203/rs.3.rs-1876766/v2 -
Metal oxygen confiance 1,0
“Tamilselvi et al., 2013 449cm-1, 511cm-1, 584cm-1, 3.3.1 Combined Effect of Methanol to Oil Molar Ratio observed major peaks at 671cm-1, confirmed and Catalyst Loading which the presence of Mg-O vibrations.”
Ameen 等 - 2022 - Biodiesel Synthesis From Cucumis melo Var. agresti DOI: 10.3389/fenrg.2022.830845 -
confiance 1,0
“The absorption band at 671 is assigned to Ni-O-Si in calcined Ni 20/m-SiO 2, Ni 15Cu 5/m-SiO 2, Ni 10Cu 10/m-SiO 2, and Ni 5Cu 15/mcm-1”
Enhanced Cyclopentanone Yield from Furfural Hydrogenation: Promotional Effect of Surface Silanols on Ni-Cu/m-Silica Catalyst DOI: 10.3390/catal13030580 -
Alkene (C=C) confiance 1,0
“[BBSQ-FeCl BBSQ-Cu2+ 3+] on ion,34 assigned to while the system Therefore,inordertoexploretheinteractionbetweenBBSQand Commons Downloaded [BBSQ-Cu2+], showed a peak at 671.3481, assigned to and Fe3+, Cu2+, Hg2+, and the metal chelator ethyl”
NIR squaraine dyes for dual colorimetric and fluorescent determination of Fe3+, Cu2+, and Hg2+ ions DOI: 10.1039/d3ra02419a
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