Hvad absorberer ved 1631 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1631 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 1631 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 |
|---|---|---|---|
| Amide | 28 | 28 | 1,0 |
| Carbonyl (C=O) | 17 | 17 | 1,0 |
| Methacrylate | 16 | 16 | 1,0 |
| Acetate | 16 | 16 | 1,0 |
| Carboxyl (COOH) | 15 | 14 | 1,0 |
| Ketone | 12 | 12 | 1,0 |
| Ester | 12 | 12 | 1,0 |
| N h | 10 | 9 | 1,0 |
| Hydroxyl (O-H) | 8 | 8 | 1,0 |
| Water (H2O) | 7 | 6 | 1,0 |
| Secondary amine | 7 | 6 | 1,0 |
| Alkene (C=C) | 6 | 6 | 1,0 |
| Aromatic ring | 6 | 6 | 1,0 |
| Alkyl C-H | 5 | 5 | 1,0 |
| C-O single bond | 5 | 5 | 1,0 |
| C n single bond | 4 | 4 | 1,0 |
| Methoxy (OCH3) | 4 | 4 | 1,0 |
| C=n | 3 | 2 | 1,0 |
| Protein | 2 | 2 | 1,0 |
| Protein beta sheet | 2 | 2 | 0,95 |
| Metal oxygen | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Amine primary | 1 | 1 | 1,0 |
| Carbon dioxide | 1 | 1 | 1,0 |
| Silanol (Si-OH) | 1 | 1 | 1,0 |
| Protein random coil | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 0,9 |
| Chitosan | 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 |
|---|---|---|---|
| silver nanoparticles | 1631, 1636, 1637 | Methacrylate, Acetate, Amide | 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 1631 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
“The peaks at 1631 are due to C=O stretching in amide group while the cm-1”
Development of a water dispersible granule (WDG) formulation of Bacillus thuringiensis for the manag DOI: 10.1080/09583157.2021.1895073 -
Hydrogen bond tillid 1,0
“The rate constant (k, of the 4-NP frameworkwaskeptunchangedafterloadingPt1CexonZSM-5.The reduction was taken as the slope of the correlation ln(c0/c) cm(cid:3)1 band at 1631 was due to hydrogen bonding stretching viagainst t (min).”
CO oxidation and 4-nitrophenol reduction over ceria-promoted platinum nanoparticles impregnated with ZSM-5 zeolite DOI: 10.1016/j.jre.2021.07.009 -
tillid 1,0
“A similar FTIR band at 1631 is ascribed to al.46 phase, explaining the blueshift of the chief band according to VegPbI 2-MAI-DMF complex by Guo In fact, the existence of et”
Hydration of mixed halide perovskites investigated by Fourier transform infrared spectroscopy DOI: 10.1063/1.5087914 -
Water (H2O) tillid 1,0
“A moderate cm-1 peak at 1629~1608 was assigned to a δ(N-H) vibration of the glycosidic ligand in the IR cm-1 spectrum of aminated glucose compared to the sharp bands at 1631 attributed to a δ(HOH) cm-1 vibration of crystal water in that of”
Liao 等 - 2011 - Synthesis and Characterization of an Aminated D-gl DOI: 10.4028/www.scientific.net/AMR.197-198.65 -
Hydroxyl (O-H) tillid 1,0
“LLM confirmed rule peak-group candidate”
Mu 等 - 2009 - Synthesis, characterization and photoluminescence DOI: 10.1088/0957-4484/20/34/345602 -
C=n tillid 1,0
“of aromatic aldehydes and CO is indicated by the band at 2856 A protein-specific 2 cm-1 peak at 1631 was linked to the stretching vibrations of the C=N and C=C bonds.”
Biosynthesis and Characterization of Silver Nanoparticles Using Tribulus terrestris Seeds: Revealed Promising Antidiabetic Potentials DOI: 10.3390/molecules28104203 -
Hydroxyl (O-H) tillid 1,0
“Analysis using FTIR in accordance with the characteristics of GO-Fe 4 cm-1 cm-1 cm-1 (O-H stretching), 1631 (C = C aromatic), and 565 (Fe-O).”
Rukman 等 - 2019 - GO-Fe3O4 Nanocomposite from coconut shell Synthes DOI: 10.1088/1755-1315/217/1/012008 -
Aromatic ring tillid 1,0
“Peaks observed at 1631 and 1730 possibly refer to C=C 11 stretching of aromatic rings, N-H vibration of amines and C=O stretching of amides 12 and carboxylic groups [39].”
Cytotoxicity and antibacterial activities of plant-mediated synthesized zinc oxide (ZnO) nanoparticles using Punica granatum (pomegranate) fruit peels extract DOI: 10.1016/j.molstruc.2019.04.026
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