Hvad absorberer ved 890 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 890 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 890 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 | 8 | 7 | 1,0 |
| Carbohydrate | 7 | 7 | 1,0 |
| C-O single bond | 6 | 6 | 1,0 |
| Phosphate (PO4) | 5 | 4 | 1,0 |
| Methoxy (OCH3) | 3 | 3 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| Metal oxygen | 3 | 2 | 1,0 |
| Silicon hydride | 3 | 2 | 1,0 |
| Alkene (C=C) | 3 | 2 | 1,0 |
| Hydroxyl (O-H) | 3 | 2 | 1,0 |
| Silicon (Si) | 2 | 2 | 1,0 |
| Phosphorus | 2 | 2 | 1,0 |
| Silicon carbon | 2 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Carbonate | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Nucleic acid | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Ring structure | 1 | 0 | 1,0 |
| Water (H2O) | 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 |
|---|---|---|---|
| Al2O3 | 890, 1722, 1383 | Alkyl C-H | 1 |
| polysaccharide | 890, 1637, 1320 | Alkyl C-H, C-O single bond | 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 890 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
“2 cm-1: jugated ketone (phenyl-carbonyl) in lignin, 1160 C-O-C asymmetrical stretching in cellulose and hemicm-1: cm-1: celluloses, 1030 C-O, C=C, and C-C-O stretching in wood, and 890 glycosidic linkage.”
Physicochemical characterisation of barley straw treated with sodium hydroxide or urea and its digestibility and in vitro fermentability in ruminants DOI: 10.1038/s41598-022-24738-w -
Carbohydrate tillid 1,0
“acid.44 illustrated both IOP and Se-IOP contained 1000 to 1200 the presence of β-galactopyranose and β-galacturonic ring.12 cm-1 The absorption peak at 889.51 or 889.1 Four carbon signal peaks in the region of 80.0-70.0 ppm and pyranoid sho”
Hu 等 - 2017 - Effects of Selenizing Modification on Characterist DOI: 10.1007/s13233-017-5030-z -
C-O single bond tillid 1,0
“cm-1 890 The bands of the mushrooms at about 1023, 1000, 930, 920, and 850 are assigned to α-glycosidic bond.”
Liu 等 - 2006 - A study of the mushrooms of boletes by Fourier tra DOI: 10.1117/12.667136 -
tillid 1,0
“The broad cm-1 band centered at 890 is clearly observed which is assigned to the Non-bridging oxygen hole centers (NBOHC) formed by Si-O-Si vibration [20, 22].”
Lu 等 - 2013 - Red Light Emission from Silicon Created by Self-io DOI: 10.4028/www.scientific.net/AMM.320.109 -
Hydroxyl (O-H) tillid 1,0
“Nowe01017 Article Ce ascribed to OH stretching vibrations, whereas the bands with maxima at 890 and cm(cid:1)1 1411 appeared caused by the in-plane and out-of-plane bending vibrations of OeH CeH bonds, respectively [28].”
Interactions between polyols and wheat biopolymers in a bread model system fortified with inulin: A Fourier transform infrared study DOI: 10.1016/j.heliyon.2018. -
C-O single bond tillid 1,0
“Moreover, the band cm-1 - C=O Distinctively, the weak absorption peak at 890 cm indicated the existing of β-type glycosidic bond 1 at 1640 was due to (-COOH) stretching vibration, which was the proof of the presence”
Song 等 - 2020 - Acetylated Polysaccharides From Pleurotus geestera DOI: 10.3390/ijms21082810 -
Acetate tillid 1,0
“trabeum fungus also yielded an increase in the band at 1150 cm-1 (vibration of C-O-C bonds from cellulose and hemicelluloses [22]), accompanied by the disappearance of the band at 890 cm-1 (out-of-plane bending of the exomethylene groups fr”
Acosta 等 - 2022 - Alumina as an Antifungal Agent for Pinus elliottii DOI: 10.3390/jof8121299 -
Alkyl C-H tillid 1,0
“Agar specific peak at 890 α-galactose (AnGal-units) whereas agar is less sulfated polydue to anomeric CH in the β-galactose residues and a band”
Antioxidant and cytotoxic activities of sulfated polysaccharides from five different edible seaweeds DOI: 10.1007/s11694-020-00661-4
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