Hvad absorberer ved 810 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 810 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 810 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 | 10 | 1,0 |
| Silicon-oxygen (Si-O) | 10 | 7 | 1,0 |
| Silicon (Si) | 7 | 6 | 1,0 |
| Alkene (C=C) | 6 | 5 | 1,0 |
| Siloxane (Si-O-Si) | 6 | 4 | 1,0 |
| Aromatic ring | 5 | 5 | 1,0 |
| Methacrylate | 5 | 5 | 1,0 |
| Acetate | 5 | 5 | 1,0 |
| Ring structure | 5 | 4 | 1,0 |
| Methoxy (OCH3) | 4 | 4 | 1,0 |
| C-O single bond | 4 | 4 | 1,0 |
| Nitrogen heterocycle | 4 | 3 | 1,0 |
| Carboxyl (COOH) | 2 | 2 | 1,0 |
| Ketone | 2 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| Amide | 2 | 2 | 1,0 |
| Amino acid | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Aldehyde (CHO) | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Lignin | 1 | 1 | 1,0 |
| Silicon carbon | 1 | 1 | 1,0 |
| Borate | 1 | 1 | 1,0 |
| Oxygen heterocycle | 1 | 1 | 1,0 |
| Carbonate | 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 |
|---|---|---|---|
| PMMA | 810, 1722, 1383 | Alkyl C-H | 1 |
| Polysaccharide | 810, 1637, 1320 | Alkyl C-H | 1 |
| PVDF | 810, 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 810 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
-
Oxygen heterocycle tillid 1,0
“It is worth mentioning that the peak at 810 (figure 8(c)) which corresponds to 27 28 the epoxy ring in AESO structure has gradually become weaker and almost disappeared after 30”
Ataei 等 - 2020 - Electrosprayed PMMA microcapsules containing green DOI: 10.1088/1361-665X/ab9754 -
Nitrogen heterocycle tillid 1,0
“The structure of the g-C 3N can be considered as 4 4 810cm-1 peak at graphite-like single layers aligned each other along the hexagonal can be attributed to the s-triazine (C 3N 3) breathing 1326-1433cm-1 1500-1627cm-1 c-axis[18].Theweakdif”
Solvothermal synthesis of the special shape (deformable) hollow g-C3N4 nanospheres DOI: 10.1016/j.matlet.2011.01.008 -
Borate tillid 1,0
“cm-1 cm-1 B-P ∼810 B-P ∼472 vibration mode located at that band in boron phosphide is located at with a shoulder at cm-1 ∼850 B-O-B P-P along with other peaks related to while symmetrical stretching mode is located at cm-1”
Dalui 等 - 2008 - Boron phosphide films prepared by co-evaporation t DOI: 10.1016/j.tsf.2007.09.047 -
tillid 1,0
“Assigned to α-crystalline phase.”
Spectroscopic and thermal investigations of poly(vinylidene fluoride) films composites with LaNi3Co2 DOI: 10.1002/crat.200610789 -
Alkyl C-H tillid 1,0
“Spectra also showed absorption bands in the 2,990-2,810cm-1, ROP with a reasonable monomer conversion, and it is also which are related to number range of C-H suitable for the copolymerization reaction.”
Herrera-Kao 等 - 2020 - Microwave-assisted synthesis of the lipase-catalyz DOI: 10.1515/epoly-2020-0067 -
Silicon (Si) tillid 1,0
“cm-1 Confirmation of the grafting process can be seen from the new FTIR peaks at 810 cm-1 13C-NMR and 749 which are attributed to the Si-C stretching and Si-C, and new signals at 10.3, 21.7 and 42.7 ppm which are assigned to C7, C8, and C9”
Indarti 等 - 2019 - Silylation of TEMPO oxidized nanocellulose from oi DOI: 10.1016/j.ijbiomac.2019.05.161 -
tillid 1,0
“Here, the O(1s) 5 1070cm(cid:4)1, obvious peaks in SiO spectrum, 810 and and spectrum of the Ta(N,O) film reveals that the oxygen in the 2 four obvious peaks in Ta(N,O) spectra, 510, 615, 805, low nitrogen films is believed to arise from th”
Microstructure and Thermal Diffusivity Investigations of RF-Sputtered Tantalum Nitride Films DOI: 10.1143/JJAP.41.5367 -
Acetate tillid 1,0
“In addition, -1 the absorption peak at 810 cm is typical of C-O-S stretching.”
Kazachenko 等 - 2021 - Food Xanthan Polysaccharide Sulfation Process with DOI: 10.3390/foods10112571
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