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
Greitas atsakymas
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.
Galimi funkcinių grupių priskyrimai
| Funkcinė grupė | Pagrindžiantys faktai | Cituoti šaltiniai | Aukščiausias pasitikėjimas |
|---|---|---|---|
| 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 |
Reitingavimas atspindi sukauptą literatūros įrodymų kiekį, o ne vieną autoritetingą taisyklę. Visada patvirtinkite pagal savo mėginio kontekstą.
Spektro logika
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.
Realus naudojimas
Šis užklausų tipas yra įprastas polimerų identifikavime, nežinomų plastikų atrankinėje analizėje, kokybės kontrolės gedimų šalinime, perdirbtų medžiagų patikroje ir literatūra pagrįstoje smailių priskyrimo peržiūroje.
Dažnos klaidos
- Vieną izoliuotą juostą laikant medžiagos įrodymu, nepatikrinus bent vienos ar dviejų patvirtinančių smailių.
- Ignoruojamas persidengimas: kelios funkcinės grupės gali prisidėti prie to paties bangos skaičiaus.
- Praleidžiant patvirtinimą, kai priedai, mišiniai, oksidacija ar užteršimas gali iškraipyti spektrą.
Patikros patarimas
Kai išlieka neaiškumų, patvirtinkite hipotezę naudodami DSC, GC-MS arba TGA, ypač mišiniams, suirusiems mėginiams ir užpildytiems polimerams.
Literatūra, kuria remiantis atlikti šie priskyrimai
-
Phosphate (PO4) pasitikėjimas 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 pasitikėjimas 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 -
pasitikėjimas 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) pasitikėjimas 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) pasitikėjimas 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 -
pasitikėjimas 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 pasitikėjimas 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 pasitikėjimas 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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