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
Snel antwoord
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.
Mogelijke functionele-groeptoewijzingen
| Functionele groep | Ondersteunende feiten | Geciteerde bronnen | Hoogste vertrouwen |
|---|---|---|---|
| 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 |
Ranglijst weerspiegelt cumulatief literatuurbewijs, niet één gezaghebbende regel. Bevestig altijd aan de hand van uw monsterecontext.
Mogelijke materialen
| Materiaal | Ondersteunende pieken | Overlappende groepen | Geciteerde bronnen |
|---|---|---|---|
| ZnO | 688, 1400, 3430 | Metal oxygen | 1 |
| kaolinite | 688, 3696, 693 | Metal oxygen | 1 |
| nanocomposites | 688, 1717, 1630 | Ring structure | 1 |
Materialen worden alleen getoond wanneer dezelfde literatuurpool deze band en ten minste één extra karakteristieke piek ondersteunt.
Spectrumlogica
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.
Gebruik in de praktijk
Dit type query komt vaak voor bij polymeeridentificatie, screening van onbekende kunststoffen, probleemoplossing bij QC, verificatie van gerecycled materiaal en literatuurondersteunde beoordeling van piektoewijzing.
Veelgemaakte fouten
- Het behandelen van een enkele geïsoleerde band als bewijs van een materiaal zonder ten minste een of twee ondersteunende pieken te controleren.
- Overlap negeren: meerdere functionele groepen kunnen bijdragen rond hetzelfde golfgetal.
- Validatie overslaan wanneer additieven, mengsels, oxidatie of verontreiniging het spectrum kunnen verstoren.
Advies voor verificatie
Wanneer dubbelzinnigheid blijft bestaan, valideer de hypothese met DSC, GC-MS of TGA, vooral voor mengsels, gedegradeerde monsters en gevulde polymeren.
Literatuur achter deze toewijzingen
-
vertrouwen 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 -
vertrouwen 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 -
vertrouwen 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) vertrouwen 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 vertrouwen 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 vertrouwen 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 vertrouwen 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 vertrouwen 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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