What absorbs at 948 cm⁻¹ in an FTIR spectrum?
A band near 948 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 6 cited sources
Brzi odgovor
A band near 948 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.
Moguće dodjele funkcionalnih skupina
| Funkcionalna skupina | Potporni dokazi | Citirani izvori | Najveća pouzdanost |
|---|---|---|---|
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Silanol (Si-OH) | 2 | 2 | 1,0 |
| Metal oxygen | 2 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 0 | 1,0 |
Rangiranje odražava akumulirane literaturne dokaze, a ne jedno autoritativno pravilo. Uvijek provjerite u kontekstu vašeg uzorka.
Logika spektra
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 948 cm⁻¹ is usually not enough for material identification by itself.
Upotreba u stvarnom svijetu
Ova vrsta upita uobičajena je u identifikaciji polimera, probiru nepoznate plastike, rješavanju problema u kontroli kvalitete, provjeri recikliranog materijala i pregledu dodjele vrhova potkrijepljenom literaturom.
Uobičajene pogreške
- Tretiranje jedne izolirane vrpce kao dokaza materijala bez provjere barem jednog ili dva podržavajuća pika.
- Zanemarivanje preklapanja: više funkcionalnih skupina može doprinositi u blizini istog valnog broja.
- Preskakanje validacije kada aditivi, mješavine, oksidacija ili kontaminacija mogu izobličiti spektar.
Savjet za provjeru
Kada nejasnoća ostane, validirajte hipotezu pomoću DSC, GC-MS ili TGA, posebno za mješavine, degradirane uzorke i punjene polimere.
Literatura iza ovih dodjela
-
Silanol (Si-OH) pouzdanost 1,0
“2020;48 cm-1, vibration of Si-OH appeared at 948 and the anti- (12):64-71+80.”
Qin 等 - 2023 - Preparation and properties of silica solmelamine DOI: 10.1080/15685551.2022.2162280 -
Metal oxygen pouzdanost 1,0
“Hence, the relative intensity of TiOH(948cm-1),Ti-O-Ti band(485cm-1)”
Wan 等 - 2006 - Structure and thermal properties of titanium dioxi DOI: 10.1007/s00289-006-0506-6 -
Silicon (Si) pouzdanost 1,0
“metric and symmetric stretching of Si-O-Si at 1080 with a shoulder at 1200 In cm-1, addition, we can see the bending vibrations of Si-O-Si at 800 and 460 whereas the cm-1 cm-1 band at 948 is assigned to Si-OH bond vibrations.”
Antibacterial Activity and Iron Release of Organic-Inorganic Hybrid Biomaterials Synthesized via the Sol-Gel Route DOI: 10.3390/app11199311 -
Acetate pouzdanost 1,0
“It was observed that C-O-Cstretching 948 etal.,(2021) thecolouredricehadhigherpeakintensitycomparedtothatofthewhite C-Cstretching 881,815 Maetal.,(2018) rice.”
New insight into the pigmented rice of northeast India revealed high antioxidant and mineral compositions for better human health DOI: 10.1016/j.heliyon.2022.e10464 -
Acetate pouzdanost 1,0
“spectrum of the Por-BZ monomer, with the main characteristic signals being those for the cm-1), cm-1), oxazine ring (948 C-O stretching (1222 and N-H stretching of the pyrrole cm-1), 1H 13C units (3319 indicative of the BZ ring having forme”
Zhang 等 - 2022 - Metal Complexes of the Porphyrin-Functionalized Po DOI: 10.3390/polym14030449 -
pouzdanost 0,8
“Peak at 948 cm-1 indicates vibrational mode of PO4^3-.”
Synthesis and structural characterization of samarium doped calcium zinc phosphate nanophosphors DOI: 10.1063/1.5047964
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