Hvad absorberer ved 500 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 500 cm⁻¹ kan pege på flere funktionelle grupper. Nedenfor er de mest sandsynlige tildelinger, rangeret efter hvor meget publiceret bevis der understøtter hver — hver enkelt spores til litteratur (DOI) og krydsvalideres mod vores 130.000+ referencespektre og vidensgraf.
Backed by 8 cited sources
Hurtigt svar
Et bånd nær 500 cm⁻¹ fortolkes normalt ved at kontrollere, hvilke funktionelle grupper der gentagne gange forekommer der i litteraturen, og derefter bekræfte mindst en eller to yderligere peaks i den samme prøve. Denne side rangerer disse tildelinger efter akkumuleret evidens snarere end efter en enkelt fast lærebogsregel.
Mulige funktionelle gruppetildelinger
| Funktionel gruppe | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| Metal oxygen | 22 | 20 | 1,0 |
| Methoxy (OCH3) | 11 | 10 | 1,0 |
| Methacrylate | 11 | 9 | 1,0 |
| Acetate | 11 | 9 | 1,0 |
| Hydroxyl (O-H) | 10 | 8 | 1,0 |
| Alkyl C-H | 9 | 8 | 1,0 |
| Silicon-oxygen (Si-O) | 8 | 8 | 1,0 |
| C-O single bond | 8 | 7 | 1,0 |
| Carboxyl (COOH) | 8 | 6 | 1,0 |
| Siloxane (Si-O-Si) | 6 | 6 | 1,0 |
| Phosphate (PO4) | 5 | 5 | 1,0 |
| Silicon (Si) | 5 | 5 | 1,0 |
| C c single bond | 4 | 4 | 1,0 |
| Amide | 4 | 3 | 1,0 |
| Bromine | 2 | 2 | 1,0 |
| Carbon bromine | 2 | 2 | 1,0 |
| Water (H2O) | 2 | 2 | 1,0 |
| Phosphorus | 2 | 2 | 1,0 |
| Methyl | 2 | 2 | 1,0 |
| N h | 2 | 2 | 1,0 |
| Aromatic ring | 2 | 1 | 1,0 |
| N-O bond | 2 | 1 | 1,0 |
| Oxygen heterocycle | 1 | 1 | 1,0 |
| Silanol (Si-OH) | 1 | 1 | 1,0 |
| Sulfur | 1 | 1 | 1,0 |
| Chlorine | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Protein | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Silicon carbon | 1 | 1 | 1,0 |
| Metalloid oxygen | 1 | 1 | 1,0 |
| Ketone | 1 | 0 | 1,0 |
| Ester | 1 | 0 | 1,0 |
| Carbonyl (C=O) | 1 | 0 | 1,0 |
| Anhydride | 1 | 0 | 1,0 |
Rangering afspejler akkumuleret litteraturevidence, ikke en enkelt fast regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| Zinc Oxide Nanoparticles | 500, 1744, 1627 | Acetate, Methacrylate, Methoxy (OCH3) | 1 |
| nanocomposite | 500, 2921, 3300 | Methacrylate, Acetate, Metal oxygen | 1 |
Materialer vises kun, når den samme litteraturpulje understøtter dette bånd og mindst en yderligere karakteristisk top.
Spektrumlogik
Dette bånd bliver meningsfuldt kun, når det læses sammen med sine nabotoppe. I praksis ser analytikere først på tildelingerne ovenfor, og kontrollerer derefter, om den samme prøve også viser andre toppe, der forventes for det samme strukturelle motiv. Et enkelt bånd nær 500 cm⁻¹ er normalt ikke nok til materialeidentifikation alene.
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
-
Acetate tillid 1,0
“The region at 1053 cm-1 corresponds to -C-O-C stretching bonds whereas the spectra with wavenumber below 500 cm-1 correspond to the presence of metal oxides, and the stretching at 485 cm-1 conCatalysts2021,11,1507 8of20 firms the presence o”
Synthesis and Characterization of Zinc Oxide Nanoparticles Using Acacia caesia Bark Extract and Its Photocatalytic and Antimicrobial Activities DOI: 10.3390/catal11121507 -
Acetate tillid 1,0
“The exothermic peak at 500 by hydrolytically stable -Si-(CH 3) groups present in HMDS corresponds to the critical temperature of -(CH 3) groups at 3 3 and TMCS, according to the chemical reactions (2) and (3) which they get oxidized leaving”
Bhagat 等 - 2007 - Rapid synthesis of water-glass based aerogels by i DOI: 10.1016/j.apsusc.2006.07.016 -
C c single bond tillid 1,0
“1000 C-Ag C-C Plasmon peak 500 Si-O C=O”
Synthesis and Characterization of Silicon Nanowires by Electroless Etching DOI: 10.1007/s11665-018-3179-z -
tillid 1,0
“FTIR analysis confirmed a successful doping procm-1 energy to migrate to the lowest-empty levels within the cess, where the peak at 500 represents the Ti-O bond.”
Structural and optical characteristics of Ti-doped ZnO nanorods deposited by simple chemical bath deposition DOI: 10.1007/s10854-017-6905-7 -
Hydroxyl (O-H) tillid 1,0
“spectra show three spectral regions of particular interest: cm-1, the the fingerprint region between 400 and 1,500 cm-1 that corresponds to region between 2,700 and 3,100 C─H the bonds in organic compounds, and the OH cm-1.”
Combining Fourier transform infrared and Raman spectroscopies with Gaussian deconvolution: An improved approach for the characterization of emeralds DOI: 10.1002/jrs.5810 -
Phosphate (PO4) tillid 1,0
“after Immersion in Phosphate Solution The FTIR spectrum of the undoped glass shows composite and connected vibrational peaks extending from 500 to about cm-1 1650 and followed by the near IR spectrum extending Figure 7 illustrates the FTIR”
Bioactivity Behavior of Multicomponent (P2O5 –B2O3- SiO2-Na2O-CaF2) Glasses Doped with ZnO, CuO or Ag2O and their Glass-Ceramics DOI: 10.1007/s12633-020-00571-6 -
tillid 1,0
“The peak at around 500 in the FTIR studies was used to investigate the extraction of chiZnO NPs spectra is due to Zn-O vibration band whereas in”
Green Synthesis, Structural Characterization and Photocatalytic Activities of Chitosan-ZnO Nano‐composite DOI: 10.1007/s10904-021-01988-1 -
tillid 1,0
“of calcium, which showed a weak positive correlation with To this end, fertilized and control samples were scanned 500cm1.”
Hssaini 等 - 2022 - Do Pollination and Pollen Sources Affect Fig Seed DOI: 10.1155/2022/3969165
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