What absorbs at 688 cm⁻¹ in an FTIR spectrum?
A band near 688 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 688 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 |
|---|---|---|---|
| Metal oxygen | 3 | 2 | 1,0 |
| Aromatic ring | 2 | 2 | 1,0 |
| Borate | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 0 | 1,0 |
| Metal hydroxyl | 1 | 0 | 1,0 |
Rangiranje odražava akumulirane literaturne dokaze, a ne jedno autoritativno pravilo. Uvijek provjerite u kontekstu vašeg uzorka.
Mogući materijali
| Materijal | Potporni vrhovi | Preklapajuće skupine | Citirani izvori |
|---|---|---|---|
| ZnO | 688, 1400, 3430 | Metal oxygen | 1 |
| kaolinite | 688, 3696, 693 | Metal oxygen | 1 |
| nanocomposites | 688, 1717, 1630 | Ring structure | 1 |
Materijali su prikazani samo kada ista literatura podržava ovu traku i barem jedan dodatni karakteristični vrh.
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 688 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
-
pouzdanost 1,0
“The peak cm-1 at 602 can be attributed to terminal oxygen vibration cm-1 of Sn-OH, while the peak appearing at 688 is due to (F1).”
Synthesis, structural and optical properties of Fe-doped nanocrystalline SnO2 DOI: 10.1007/s10854-017-7018-z -
pouzdanost 1,0
“In addition to the Ni-O Characterization above bands, the characteristic absorption band of obcm-1 served at 688 corresponds to the stretching vibrations of Ni-O.ItwasobservedthatwiththeadditionofNiOinPMOTFourier transform infrared (FTIR) s”
Sehgal 和 Narula - 2015 - Structural, morphological, optical, and electrical DOI: 10.1007/s00396-015-3663-z -
pouzdanost 1,0
“reveals the characteristic vibrational bands at 557, 688, 717, 881, 935 and 1039 The cm-1 vibrational modes at 557 and 717 are assigned to the structural vibrations of yttrium-oxygen cm-1 (Y-O) bonds, the peak at 688 to the stretching mode”
Luminescence and electron spin resonance studies of narrow-band UVB emitting Gd3+ doped Y2SiO5 nanophosphors synthesized by sol-gel method DOI: 10.1016/j.ijleo.2021.167228 -
Silicon (Si) pouzdanost 1,0
“cm-1 Three medium bands appeared at 688, 752 and 795 were assigned to the deformation modes of AlVI-O-Si bands [21-22].”
Souissi 等 - 2022 - Synthesis, Thermal Properties and Electrical Condu DOI: 10.21203/rs.3.rs-1294285/v1 -
Amide pouzdanost 1,0
“582cm-1 The peaks at 688 and 900 and have been previously assigned to the α-form of various b nylons16-20 as the amide V and VI, respectively.”
[gamma]-Crystalline form of nylon-10,10 in nylon-10,10-montmorillonite nanocomposite DOI: 10.1002/pi.1154 -
Aromatic ring pouzdanost 1,0
“Meanwhile, C=C of aromatic ring vibrations were observed at 687.5 the presence of these peak intensities is attributed to pure cinnamaldehyde (Figure 6 (b;”
Alamier 等 - 2022 - Thermodynamic and Spectroscopic Studies of SDS in DOI: 10.3390/app122312020 -
Borate pouzdanost 1,0
“The absorption peaks at 687.62, 953.71 and 1345.78 attribute to borate network according to Table 3.”
Facile Synthesis of Calcium Borate Nanoparticles and the Annealing Effect on Their Structure and Size DOI: 10.3390/ijms131114434 -
Metal oxygen pouzdanost 1,0
“1554 - 1427 Zn-O stretching 688 450”
Fadillah 等 - 2017 - Fabrication and Characterization of ZnO and Li dop DOI: 10.1063/1.4991157
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