Hvad absorberer ved 1200 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1200 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 1200 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 |
|---|---|---|---|
| C-O single bond | 49 | 48 | 1,0 |
| Methacrylate | 47 | 46 | 1,0 |
| Acetate | 47 | 46 | 1,0 |
| Methoxy (OCH3) | 45 | 44 | 1,0 |
| Alkyl C-H | 26 | 23 | 1,0 |
| Hydroxyl (O-H) | 23 | 20 | 1,0 |
| Amide | 19 | 19 | 1,0 |
| Carbohydrate | 17 | 16 | 1,0 |
| Silicon-oxygen (Si-O) | 17 | 14 | 1,0 |
| Phosphate (PO4) | 13 | 13 | 1,0 |
| Silicon (Si) | 12 | 10 | 1,0 |
| Siloxane (Si-O-Si) | 11 | 10 | 1,0 |
| Secondary amine | 10 | 10 | 1,0 |
| Carboxyl (COOH) | 10 | 9 | 1,0 |
| C n single bond | 9 | 9 | 1,0 |
| C c single bond | 9 | 8 | 1,0 |
| N h | 8 | 8 | 1,0 |
| Borate | 7 | 7 | 1,0 |
| Aromatic ring | 7 | 6 | 1,0 |
| Carbonyl (C=O) | 6 | 5 | 1,0 |
| Ring structure | 6 | 4 | 1,0 |
| Phosphorus | 5 | 5 | 1,0 |
| Ester | 5 | 5 | 1,0 |
| Water (H2O) | 5 | 5 | 1,0 |
| Alkene (C=C) | 4 | 4 | 1,0 |
| N-O bond | 4 | 4 | 1,0 |
| Ketone | 3 | 3 | 1,0 |
| Metal oxygen | 3 | 2 | 1,0 |
| Protein | 3 | 2 | 1,0 |
| Nucleic acid | 2 | 2 | 1,0 |
| Silicon carbon | 2 | 2 | 1,0 |
| Lignin | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| Chlorine | 1 | 1 | 1,0 |
| Sulfate (SO4) | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Nitride | 1 | 1 | 1,0 |
| Aldehyde (CHO) | 1 | 1 | 1,0 |
| Nitrogen heterocycle | 1 | 1 | 0,8 |
Rangering afspejler akkumuleret litteraturevidence, ikke en enkelt fast regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| PEG | 1200, 1650, 1342 | Methacrylate, Acetate, C-O single bond | 1 |
| hydroxyapatite | 1200, 1620, 1639 | Methacrylate, Acetate | 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 1200 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
-
Carbohydrate tillid 1,0
“The FTIR bands in the region of 900fucoidan standard is due to more sulfation at 1200cm-1 are characteristic of carbohydrates equatorial at the position in C3 and C2 (Patankar, (Pielesz and Biniaś, 2010).”
Artemisia 等 - 2019 - The Properties of Brown Marine Algae Sargassum tur DOI: 10.14499/indonesianjpharm30iss1pp43 -
Hydroxyl (O-H) tillid 1,0
“The baseline was subtracted from the raw nitrogencooledMCT-Adetector.Forpolarizedinfraredmeasurements,a spectrum and the OH absorption band area was calculated by 1200line/mmzincselenidewiregridpolarizerwasused.Spectrawere acquiredwitha100µ”
Calibration of the infrared molar absorption coefficients for H in olivine, clinopyroxene and rhyolitic glass by elastic recoil detection analysis DOI: 10.1016/j.chemgeo.2009.01.001 -
Silicon (Si) tillid 1,0
“Short-term acid leaching of palygorskitesresultsinsignificantchangestoFTIRabsorptionbandsnear1200and790cm-1.Astheacidattackprogresses,thebandat1200cm-1 790cm-1, shifts to lower wavenumbers, whilst the band at which here is assigned to Si U-”
Cai 等 - 2007 - A Fourier transform infrared spectroscopic study o DOI: 10.1016/j.saa.2006.02.053 -
tillid 1,0
“Changes in the peaks and cm-1) appearence of new bands (between 1200 and 1500 revealed on the interactions between RR 120 molecules and functional groups of MOS (e.g., amino, carbonyl and amide groups) play significant roles in this process”
Adsorption Kinetic and Isotherms of Reactive Red 120 on <i>Moringa oleifera</i> Seed as an Eco-Friendly Process DOI: 10.1016/j.molstruc.2019.05.106 -
Phosphate (PO4) tillid 1,0
“6 also shows the average IR spectra of the carbonate and 1200cm-1 phosphate bands between 800 and for the calcified calcifieddepositsoftendonandmusclesamples(Fig.6).Ithasbeen reportedthatapeaknear1020cm-1isattributedtothe(cid:2) sample depo”
Chiou 等 - 2011 - FT-IR microscopic imaging of calcified deposit of DOI: 10.1016/j.vibspec.2011.06.004 -
Secondary amine tillid 1,0
“1350cm(cid:3)1 1280cm(cid:3)1 Since the peaks in the range of till are 935cm(cid:3)1, 1151cm(cid:3)1, cm(cid:3)1 1230cm(cid:3)1 autopeaks at 1200 and in (CAN described as peaks for aromatic secondary amine stretch), M23/08.”
Choong 等 - 2014 - Identification of geographical origin of Lignosus DOI: 10.1016/j.molstruc.2014.04.001 -
Acetate tillid 1,0
“The multiple bands between 1200 and 1000 may be assigned to C-O stretching of RIPT”
Mesoporous magnetite nanoparticles synthesis using the Peltophorum pterocarpum pod extract, their antibacterial efficacy against pathogens and ability to remove a pollutant dye DOI: 10.1016/j.molstruc.2018.10.042 -
Silicon carbon tillid 1,0
“sic absorption band of chitosan at 1200 950 is less intense”
New versatile approach for analysis of PEG content in conjugates and complexes with biomacromolecules based on FTIR spectroscopy. DOI: 10.1016/j.colsurfb.2016.01.030
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