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
Hurtigt svar
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.
Mulige funktionelle gruppetildelinger
| Funktionel gruppe | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| 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 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| silica | 518, 1100, 1080 | Silicon (Si) | 2 |
| montmorillonite | 518, 1637, 523 | Silicon (Si) | 1 |
Materialer vises kun, når den samme litteraturpulje understøtter dette bånd og mindst en yderligere karakteristisk top.
Spektrumlogik
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.
Anvendelse i virkeligheden
Denne type forespørgsel er almindelig ved polymeridentifikation, screening af ukendt plast, fejlfinding i kvalitetskontrol, verifikation af genanvendt materiale og litteraturunderstøttet gennemgang af peak-tildeling.
Almindelige fejl
- Behandling af et isoleret bånd som bevis på et materiale uden at kontrollere mindst en eller to understøttende toppe.
- Ignorerer overlap: flere funktionelle grupper kan bidrage nær samme bølgetal.
- Spring validering over, når additiver, blandinger, oxidation eller forurening kan forvrænge spektret.
Verifikationsrådgivning
Når tvetydighed fortsat består, valider hypotesen med DSC, GC-MS eller TGA, især for blandinger, nedbrudte prøver og fyldte polymerer.
Litteratur bag disse tildelinger
-
Silicon (Si) tillid 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) tillid 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 -
tillid 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 tillid 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
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