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
Rychlá odpověď
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.
Možná přiřazení funkčních skupin
| Funkční skupina | Podpůrná fakta | Citované zdroje | Nejvyšší spolehlivost |
|---|---|---|---|
| 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 |
Pořadí odráží nahromaděné literární důkazy, nikoli jediné autoritativní pravidlo. Vždy potvrďte v kontextu vašeho vzorku.
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.
Reálné použití
Tento typ dotazu je běžný při identifikaci polymerů, screeningu neznámých plastů, řešení problémů s QC, ověřování recyklovaných materiálů a kontrole přiřazení píků podložené literaturou.
Běžné chyby
- Považování jednoho izolovaného pásu za důkaz materiálu bez kontroly alespoň jednoho nebo dvou podpůrných píků.
- Ignorování překryvu: více funkčních skupin může přispívat poblíž stejného vlnočtu.
- Přeskakování validace, když mohou aditiva, směsi, oxidace nebo kontaminace zkreslit spektrum.
Rady pro ověření
Pokud přetrvává nejednoznačnost, ověřte hypotézu pomocí DSC, GC-MS nebo TGA, zejména u směsí, degradovaných vzorků a plněných polymerů.
Literatura za těmito přiřazeními
-
Phosphate (PO4) spolehlivost 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 spolehlivost 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 -
spolehlivost 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) spolehlivost 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) spolehlivost 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 -
spolehlivost 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 spolehlivost 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 spolehlivost 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
Máte spektrum s tímto pásem?
Nahrajte své FTIR spektrum a získejte plnou interpretační zprávu – přiřazení píků s citacemi literatury, shody s knihovnou a řetězec důkazů s hodnocením spolehlivosti – během několika sekund.