What absorbs at 768 cm⁻¹ in an FTIR spectrum?
A band near 768 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
Brzi odgovor
A band near 768 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 |
|---|---|---|---|
| Water (H2O) | 2 | 2 | 1,0 |
| Aromatic ring | 2 | 2 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Chlorine | 1 | 1 | 1,0 |
| Silicon silicon | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 0,9 |
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 768 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
-
Phosphate (PO4) pouzdanost 1,0
“cm-1 (ii) The peak at 768 is assigned to symmetric stretching vibrations of the P-O-P rings and possible sharing At high dose of irradiation, most of the IR spectral bands of (AlO show distinct decrease in their intensities and a prominent”
Photoluminescence, optical and structural properties of Pr3+-doped fluorophosphate glasses and their induced defects by gamma irradiation DOI: 10.1007/s10854-018-9120-2 -
Aromatic ring pouzdanost 1,0
“The band at 768 was 3.18% regression attributed to the ortho-disubstituted phenyl group.”
Attenuated total reflection‐Fourier transform infrared spectroscopy (ATR‐FTIR) for quantification of piroxicam in tablet dosage from as a green analytical method DOI: 10.1002/vjch.202000049 -
pouzdanost 1,0
“Explicit assignment in text”
Novel Copper(II) Complexes with N4,S-Diallylisothiosemicarbazones as Potential Antibacterial/Anticancer Drugs DOI: 10.3390/inorganics11050195 -
Hydroxyl (O-H) pouzdanost 1,0
“The around 1600 cm-1 H-O-H bending were assigned to Si-Si and The former could be attributed to the bands at ν= 768 and 728 Al-Si stretching vibrations, respectively.”
Nojiri 等 - 2013 - Structural change of alkali feldspar by ball milli DOI: 10.2465/jmps.121122 -
Water (H2O) pouzdanost 1,0
“cm-1 cm-1, both DFO-B applications, the increased maxima at 1637 and 3342 assigned to as the intensive agarose peaks at 1370cm-1, 1037 cm-1, 928 cm-1, 887 cm-1 and 768 cm-1 were hydroxyls, are probably due to the water absorbed during the a”
Desferrioxamine B: Investigating the Efficacy of Hydrogels and Ethanol Gels for Removing Akaganeite and Maghemite from Dry Wooden Substrates DOI: 10.3390/f14020247 -
pouzdanost 1,0
“cm-1 cm-1 parameter in this study, we attempted to estimate those 768 (C-Cl stretch = alkyl halides) and 646 (- C:C-H: phytochemicals quantitatively in MEAIL.”
Identification of food preservative, stress relief compounds by GC–MS and HR-LC/Q-TOF/MS; evaluation of antioxidant activity of Acalypha indica leaves methanolic extract (in vitro) and polyphenolic fraction (in vivo) DOI: 10.1007/s13197-017-2590-z) -
Metal oxygen pouzdanost 1,0
“In Figure 7, the strong peak at 768 cm-1 is due to the W-O bond in the tetrahedral.”
Electro-Oxidation of Metal Oxide-Fabricated Graphitic Carbon Nitride for Hydrogen Production via Water Splitting DOI: 10.3390/coatings12050548 -
Alkyl C-H pouzdanost 0,9
“Text: '768 cm-1 for C-H bending'.”
Bromo-substituted blocked hexamethylene diisocyanate adduct: synthesis, characterization and applica DOI: 10.1080/10601325.2020.1845569
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