Hvad absorberer ved 1080 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1080 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 1080 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 | 52 | 49 | 1,0 |
| Methacrylate | 45 | 43 | 1,0 |
| Acetate | 45 | 43 | 1,0 |
| Methoxy (OCH3) | 45 | 43 | 1,0 |
| Silicon-oxygen (Si-O) | 42 | 37 | 1,0 |
| Phosphate (PO4) | 19 | 19 | 1,0 |
| Silicon (Si) | 19 | 17 | 1,0 |
| Siloxane (Si-O-Si) | 17 | 15 | 1,0 |
| Amide | 13 | 13 | 1,0 |
| Carbohydrate | 12 | 12 | 1,0 |
| Alkyl C-H | 12 | 10 | 1,0 |
| Hydroxyl (O-H) | 12 | 10 | 1,0 |
| Phosphorus | 6 | 6 | 1,0 |
| Secondary amine | 6 | 6 | 1,0 |
| C n single bond | 6 | 6 | 1,0 |
| Ring structure | 5 | 5 | 1,0 |
| C c single bond | 5 | 4 | 1,0 |
| Nucleic acid | 5 | 4 | 1,0 |
| N h | 4 | 4 | 1,0 |
| Ester | 3 | 3 | 1,0 |
| Carboxyl (COOH) | 3 | 3 | 1,0 |
| Carbonyl (C=O) | 3 | 3 | 1,0 |
| Chitosan | 3 | 3 | 1,0 |
| Aromatic ring | 3 | 3 | 1,0 |
| Aldehyde (CHO) | 3 | 3 | 0,9 |
| Phospholipid | 2 | 2 | 1,0 |
| Protein | 2 | 2 | 1,0 |
| Metal oxygen | 2 | 2 | 1,0 |
| Boron nitrogen | 2 | 0 | 1,0 |
| Amine primary | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Chlorine | 1 | 1 | 1,0 |
| Oxygen heterocycle | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Silicon carbon | 1 | 1 | 1,0 |
| Protein beta turn | 1 | 1 | 1,0 |
| Lipid | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Metal hydroxyl | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Sulfonyl | 1 | 1 | 0,9 |
| Carbonate | 1 | 0 | 1,0 |
| Thiocarbonyl | 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 |
|---|---|---|---|
| glycerol | 1080, 1585, 1630 | Methacrylate, Acetate, C-O single bond | 2 |
| PVA | 1080, 1660, 2930 | Acetate, Methacrylate, C-O single bond | 1 |
| starch | 1080, 1650, 1540 | Methacrylate, Acetate, C-O single bond | 1 |
| CeO2 | 1080, 1554, 1630 | Acetate, Methacrylate, Methoxy (OCH3) | 1 |
| AgNPs | 1080, 1232, 1048 | Methacrylate, Acetate, Methoxy (OCH3) | 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 1080 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
“cm-1 ing of CH wagging is related to the band at 1412 cm-1 in PVA, and C-H deformation is In addition, the -C-Ostretching in PVA is the source for the band at 1080 [22], 2 which is decreased and shifted in its intensity in PSP_1 and PSP_2,”
Characteristics of a Plasticized PVA-Based Polymer Electrolyte Membrane and H+ Conductor for an Electrical Double-Layer Capacitor: Structural, Morphological, and Ion Transport Properties DOI: 10.3390/membranes -
tillid 1,0
“366 J.Chandradassetal./JournalofAlloysandCompounds479(2009)363-367 peakwasobservedat1080◦Cforcitricacidcorrespondsto(cid:5)-Al 2O 3”
Chandradass 等 - 2009 - Effect of different fuels on the alumina-ceria com DOI: 10.1016/j.jallcom.2008.12.119 -
Acetate tillid 1,0
“between 930 and These peaks resulted from 1079.60cm(cid:1)1 C-O the bond stretching.”
Characterization of nanoscale retrograded starch prepared by a sonochemical method DOI: 10.1002/star.201500313 -
Acetate tillid 1,0
“broad peaks that were observed at 3391.55 (between cm-1 cm-1) cm-1 Moreover, the absorption peak at 1069.07 is related 3300 and 3500 and 1243.37 (between 1080 cm-1) to the stretching vibration of Alcohol C-O, Ester C-O, or and 1360 represen”
Green Synthesis, Characterization and Antifungal Activity of Silver Nanoparticles Using Stems and Flowers of Felty Germander DOI: 10.1007/s10904-020-01449-1 -
tillid 1,0
“This corresponds to the increase in Si-O vibration peak at 1080 cm(cid:2)1 and leads to a partial loss of H.”
Gorbanyuk 等 - 2006 - Porous silicon microstructure and composition char DOI: 10.1016/j.tsf.2005.08.188 -
tillid 1,0
“Additionally to the peaks in not annealed samples we found a Si-O stretching peak at x cm-1 ~1080 [12].”
Si and SiC nanocrystals in an amorphous SiC matrix: Formation and electrical properties DOI: 10.1002/pssc.201000176 -
Amide tillid 1,0
“The peaks of amide-III and 1080 Banker, G.”
Effect of plasticizer content on the functional properties of extruded gelatin-based composite films DOI: 10.1016/j.foodhyd.2012.10.009 -
Phosphate (PO4) tillid 1,0
“Moreover, IR cm-1 2absorption bands at 1080 and 968 were attributed to symmetric PO stretching and O-P-O bending vibration, respectively.”
A novel FTIR discrimination based on genomic DNA for species-specific analysis of meat and bone meal DOI: 10.1016/j.foodchem.2019.05.088
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