What absorbs at 549 cm⁻¹ in an FTIR spectrum?
A band near 549 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
Hurtigt svar
A band near 549 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 |
|---|---|---|---|
| Metal oxygen | 3 | 3 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 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 |
|---|---|---|---|
| silver nanoparticles | 549, 1636, 1631 | Methacrylate, C-O single bond, Methoxy (OCH3) | 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 549 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
-
Alkyl C-H tillid 1,0
“Cthe spectra at 3keV with an atomic percentage of 55.32 indicates the presence of band at wavenumber 549 Previous studies have also reported that the nanoparticle size Br functional group belongs to alkyl halides.”
Biofabrication of silver nanoparticles from aqueous leaf extract of Leucas aspera and their anticancer activity on human cervical cancer cells DOI: 10.1088/2043-6254/ab5103 -
tillid 1,0
“Text: 'vibration bands at around 549 and 1226 indicated the presence of double 5-ring in ZSM-5.'”
Synthesis of ZSM5 Zeolite Particles Using Triethanol Amine as StructureDirecting Agent DOI: 10.1111/j.1551-2916.2011.05006.x -
Metal oxygen tillid 1,0
“Cr O , nopeakof 2oranyotherstoichiometryofchromiumoxidewasfoundinthe CrO 2 3 investigation.TheRamanbandcentredat549cm-1isofA 1gmodesymmetry,whiletheshiftat304cm-1and 350cm-1areofE gsymmetry[16,17].”
Ogwu 等 - 2016 - Corrosion, ion release and Mott-Schottky probe of DOI: 10.1088/2053-1591/3/4/045401 -
Metal oxygen tillid 1,0
“437cm(cid:2)1and 598cm(cid:2)1 absorption bands at 549, are related to the vibrations of the metal-oxygen bond in octahedral and tetrahedral sites, respectively.”
Rasouli 等 - 2020 - Structural, magnetic, and microwave absorption pro DOI: 10.1080/08327823.2020.1714104 -
Aromatic ring tillid 1,0
“1A, 1E), both the 1,649 and and cm-1, cm-1, cm-1 1,516 1,496 (aromatic ring skeleton vibracm-1 absorption peaks appear simultaneously the 1,549 cm-1, cm-1 1,375 (C-H bending vibration), and tion), 1,472 in their spectra.”
Ch'ng 等 - 2016 - Vasorelaxation Study and Tri-Step Infrared Spectro DOI: 10.3831/KPI.2016.19.016 -
Acetate tillid 1,0
“Cells were cultured in T-75 conformational changes in both proteins and nucleic acids, as 80-90% flasks (Greiner, USA) and at confluence, they were C-O well as showed a higher band of carbohydrates in A549 sub-cultured in a 1:10 to 1:12 spl”
Guler 等 - 2019 - Characterization of CD133(+)CD44(+) human prostat DOI: 10.1039/c9an00093c -
tillid 1,0
“bond between Mg and O shows a peak at 549 cm-1 Int.”
Lopez-Rodriguez 等 - 2023 - Dyeing with Hydrotalcite Hybrid Nanoclays and Disp DOI: 10.3390/ijms24010808 -
Metal oxygen tillid 0,9
“Explicit assignment in text.”
Velayutham 和 Selvapandiyan - 2019 - Effect of yttrium ion on the properties of tri eth DOI: 10.1016/j.heliyon.2019.e02091
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