Hvad absorberer ved 870 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 870 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 870 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 |
|---|---|---|---|
| Alkyl C-H | 10 | 9 | 1,0 |
| Carbonate | 9 | 9 | 1,0 |
| C-O single bond | 7 | 6 | 1,0 |
| Methoxy (OCH3) | 6 | 5 | 1,0 |
| Methacrylate | 6 | 5 | 1,0 |
| Acetate | 6 | 5 | 1,0 |
| Metal oxygen | 4 | 4 | 1,0 |
| Hydroxyl (O-H) | 4 | 2 | 1,0 |
| Phosphate (PO4) | 3 | 3 | 1,0 |
| Aromatic ring | 3 | 3 | 1,0 |
| Silicon-oxygen (Si-O) | 3 | 3 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| Oxygen heterocycle | 2 | 2 | 1,0 |
| Silicon (Si) | 2 | 2 | 1,0 |
| Carbohydrate | 2 | 2 | 1,0 |
| Silicate | 1 | 1 | 1,0 |
| Nucleic acid | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| C-S single bond | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Silanol (Si-OH) | 1 | 1 | 1,0 |
| Silicon hydride | 1 | 1 | 1,0 |
| Silicon carbon | 1 | 1 | 1,0 |
| Fluorine (C-F) | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 0 | 0,9 |
Rangering afspejler akkumuleret litteraturevidence, ikke en enkelt fast regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| ZnO | 870, 1400, 3430 | Alkyl C-H, C-O single bond, Methoxy (OCH3) | 2 |
| SiC | 870, 791, 805 | Alkyl C-H | 1 |
| PVC | 870, 834, 1195 | Alkyl C-H, Methoxy (OCH3), C-O single bond | 1 |
| PVDF | 870, 1160, 840 | Alkyl C-H | 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 870 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
-
Alkyl C-H tillid 1,0
“The thermogram indicated C-H stretching while the bands at 870 and cm-1 the thermostability of the gum to high 770 indicated the C-H bending.”
Bamigbola 等 - 2018 - Isolation and Characterization of Cola acuminata G DOI: 10.9734/JPRI/2018/14526 -
Acetate tillid 1,0
“In contrast, the slow C pool refl ects the mid-range stability as (C-O stretch of cellulose), and 870 (aromatic C-H and C=C).”
Calderon 等 - 2011 - Chemical Differences in Soil Organic Matter Fracti DOI: 10.2136/sssaj2009.0375 -
Alkyl C-H tillid 1,0
“700-900 liptinite, semifusinite, and fusinite from several representative coal out-of-plane deformation at In addition, inertinite Table4 cm-1bandsinthearomatic Evolutionoftheintegratedpeakareasof870,815,and715 C-H out-of-plane deformation”
Chen 等 - 2012 - Characterization of chemical functional groups in DOI: 10.1016/j.coal.2012.09.001 -
Amide tillid 1,0
“cm-1, cm-1, There were three primary peak absorptions on the wavelengths ranged from 400-515 870 cm-1 and 1250 showing that the ZnO absorption was identified on the wavelengths ranged from 400cm-1, 515 while the absorption of H-C-N function”
Idiawati 等 - 2017 - Effect of Growth Time on the Characteristics of Zn DOI: 10.1088/1757-899X/202/1/012050 -
Alkyl C-H tillid 1,0
“Table4 Peakareasforreflectancemicro-FTIRspectra.AR1=areaof3100-3000cm-1/areaof3000-2800cm-1.AR2=areaof900-700cm-1/areaof3000-2800cm-1.%2960=areaofband centeredat2960cm-1/areaof3000-2800cm-1.%2920=areaofbandcenteredat2920cm-1/areaof3000-2800”
Geochemical and petrographic alteration of rapidly heated coals from the Herrin (No. 6) Coal Seam, Illinois Basin DOI: 10.1016/j.coal.2016.08.022 -
C c single bond tillid 1,0
“Asymmetrical stretching vibrations of C-C-C and C-F stretching vibrations were attributed to cm-1 cm-1, the bands at 870 and 842 respectively [24].”
Ramadan 和 Ismail - 2022 - Tunning the Physical Properties of PVDFPVCZinc F DOI: 10.21203/rs.3.rs-935328/v1 -
Alkyl C-H tillid 1,0
“The intense peak at 870 tial oils to acts as stabilizing and reducing agents for biosynthesis of CuO ˭C-H attributed to the vibration due to their presence of alkene funcNPs from copper sulfate.”
Green chemistry route of biosynthesized copper oxide nanoparticles using Psidium guajava leaf extract and their antibacterial activity and effective removal of industrial dyes DOI: 10.1016/j.jece.2021.105033 -
Silicon carbon tillid 1,0
“10001C, annealed at the FWHM of the (002) ZnO peak is films have a great relation with the condition of the SiC 0.191 only which is much smaller than those without SiC buffer layer due to the hetero-interfaces being very sensitive 891cm(cid”
Sha 等 - 2006 - Initial study on the structure and optical propert DOI: 10.1016/j.physe.2006.03.138
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