What absorbs at 518 cm⁻¹ in an FTIR spectrum?
A band near 518 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 4 cited sources
Hiter odgovor
A band near 518 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.
Možne dodelitve funkcionalnih skupin
| Funkcionalna skupina | Podporna dejstva | Citirani viri | Najvišje zaupanje |
|---|---|---|---|
| Silicon (Si) | 3 | 3 | 1,0 |
| Metal oxygen | 2 | 2 | 1,0 |
| Silicon silicon | 1 | 1 | 1,0 |
| Phosphorus | 1 | 0 | 1,0 |
| Phosphate (PO4) | 1 | 0 | 1,0 |
Razvrstitev odraža zbrane literaturne dokaze, ne enega avtoritativnega pravila. Vedno preverite glede na kontekst vašega vzorca.
Možni materiali
| Material | Podporni vrhovi | Prekrivajoče se skupine | Citirani viri |
|---|---|---|---|
| silica | 518, 1100, 1080 | Silicon (Si) | 2 |
| montmorillonite | 518, 1637, 523 | Silicon (Si) | 1 |
Materiali so prikazani le, ko ista literaturna podlaga podpira ta pas in vsaj en 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 518 cm⁻¹ is usually not enough for material identification by itself.
Uporaba v resničnem svetu
Ta vrsta poizvedbe je pogosta pri identifikaciji polimerov, pregledovanju neznanih plastičnih mas, odpravljanju težav pri QC, preverjanju recikliranih materialov in literaturno podprtem pregledu dodelitev vrhov.
Pogoste napake
- Obravnavanje enega izoliranega pasu kot dokaza o materialu brez preverjanja vsaj enega ali dveh podpornih vrhov.
- Ignoriranje prekrivanja: več funkcionalnih skupin lahko prispeva blizu istega valovnega števila.
- Izpuščanje validacije, ko lahko dodatki, mešanice, oksidacija ali kontaminacija popačijo spekter.
Nasvet za preverjanje
Ko ostaja dvoumnost, potrdite hipotezo z DSC, GC-MS ali TGA, zlasti za mešanice, degradirane vzorce in polnjene polimere.
Literatura za temi dodelitvami
-
Silicon (Si) zaupanje 1,0
“The pronounced peak around cm-1 518 was observed from the Raman spectrum, characteristic of crystalline silicon.”
Nanostructured Silicon Derived from an Agricultural Residue Bagasse Ash via Magnesiothermic Reduction Method DOI: 10.3390/coatings13020221 -
Silicon (Si) zaupanje 1,0
“tions of SiO4 tetrahedra at 668 and 603 cm-1 (νsSi-O-Si), and 518 and 473 cm-1, due to Sicm-1 cm-1, (ν tions of SiO tetrahedra at 668 and 603 sSi-O-Si), and 518 and 473 due to 4 O-Si and O-Si-O bending vibrations, respectively.”
Phase Composition of Silica Fume—Portland Cement Systems Formed under Hydrothermal Curing Evaluated by FTIR, XRD, and TGA DOI: 10.3390/ma14112786 -
zaupanje 1,0
“In addition, the absorption and 518 cm-1 and 471 cm-1 for Cn-MT2 are attributed to Mg-O-Si and Mg-O bending vibration,”
Qiu 等 - 2020 - Comprehensive Characterization of the Structure an DOI: 10.3390/min10040378 -
Metal oxygen zaupanje 0,9
“Peak at 518 related to Fe-O, Al-O, Fe-Al-O”
Heteropolyacid coupled with cyanoguanidine decorated magnetic chitosan as an efficient catalyst for the synthesis of pyranochromene derivatives DOI: 10.1038/s41598-022-21196-2
Imate spekter s tem pasom?
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