Hvad absorberer ved 1418 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1418 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 1418 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 | 8 | 1,0 |
| Methoxy (OCH3) | 9 | 9 | 1,0 |
| Acetate | 9 | 9 | 1,0 |
| Methacrylate | 8 | 8 | 1,0 |
| C-O single bond | 7 | 6 | 1,0 |
| Carboxyl (COOH) | 4 | 4 | 1,0 |
| C c single bond | 3 | 3 | 1,0 |
| Hydroxyl (O-H) | 3 | 3 | 1,0 |
| Methyl | 2 | 2 | 1,0 |
| N h | 2 | 2 | 1,0 |
| Protein | 2 | 2 | 1,0 |
| Aromatic ring | 2 | 2 | 1,0 |
| Carbonate | 2 | 2 | 1,0 |
| Fluorine (C-F) | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Ammonium | 1 | 1 | 1,0 |
| Chitosan | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Oxalate | 1 | 1 | 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 |
|---|---|---|---|
| Chitosan | 1418, 1650, 1655 | Alkyl C-H, Acetate, Methacrylate | 1 |
| NaOH | 1418, 3429, 897 | Alkyl C-H, Methoxy (OCH3), Methacrylate | 1 |
| polyaniline | 1418, 1565, 1570 | Alkyl C-H, Methacrylate, Acetate | 1 |
| copolymer | 1418, 2921, 1540 | Alkyl C-H, Methacrylate, Acetate | 1 |
| silver nanoparticles | 1418, 1636, 1631 | Alkyl C-H, 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 1418 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
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Aromatic ring tillid 1,0
“cm-1, which indicate C C the peaks at 1535and 1487 wileyonlinelibrary.com] stretching mode in quinoid ring and benzenoid ring, cm-1 respectively,[22]peaks at 1418and at 3361 appear TABLE 1 Peak position and ((cid:1))”
Dey Sadhu 等 - 2020 - Preparation and characterization of polyanilinea DOI: 10.1002/pc.25738 -
tillid 1,0
“2 3 cm-1, cm-1, group peak at 1376 C-N axial deformation (amino group peak) at 1418 CH 2 (1-4)-glucosidic”
Removal of Hexavalent Chromium by Cross-Linking Chitosan and N,N’-Methylene Bis-Acrylamide DOI: 10.1007/s40710-020-00447-2 -
C c single bond tillid 1,0
“cm-1(broadband 3273 with high intensity), aromatic C-C the improvement in the thermal stability of the prepared S/ cm-1, cm-1, stretching at 1418 and rocking of CH at 715 GG-microencapsulate.”
Garden cress gum and maltodextrin as microencapsulation coats for entrapment of garden cress phenolic-rich extract: improved thermal stability, storage stability, antioxidant and antibacterial activities DOI: 10.1007/s10068-022-01171-3 -
Carbonyl (C=O) tillid 1,0
“A major peak at 1638 corresponds to carbonyl stretch of cm-1 quinone24, conjugate ketone or the peak at 1418 and 1364 corresponds to O-C-H, C-C-H, C-O-H bending 2 Scientific RepoRtS | | https://doi.org/10.1038/s41598-020-62895-y (2020) 10:6”
Microbial quality assessment of minimally processed pineapple using GCMS and FTIR in tandem with chemometrics DOI: 10.1038/s41598-020-62895-y -
Carbonate tillid 1,0
“FTIR analysis of TiO2NPs using ESE showed sharp peaks at 720, 870, 1047/1060, and 1410/1418 cm-1, which can be attributed to the vibrations of carbonate CO3-2 anions (Figure 6B) [58,59].”
Green Synthesis of Silver and Titanium Oxide Nanoparticles Using Tea and Eggshell Wastes, Their Characterization, and Biocompatibility Evaluation DOI: 10.3390/su151511858 -
Protein tillid 1,0
“The peaks at 1418, 875, and cm-1 perature and weight loss of the unmodified and modified 712 correspond to other proteins in the membrane.”
The Taste of Waste: The Edge of Eggshell Over Calcium Carbonate in Acrylonitrile Butadiene Rubber DOI: 10.1007/s10924-019-01530-y -
Alkyl C-H tillid 1,0
“The cm-1 cm-1 peak near 1418 is attributed to the CH bending [48].”
Enhanced Saccharification of Purple Alfalfa via Sequential Pretreatment with Acidified Ethylene Glycol and Urea/NaOH DOI: 10.3390/pr10010061 -
Chitosan tillid 1,0
“The FTIR spectra of the CTS-ZMS (red line and black line) illustrated the band at 1654 cm-1 corresponded to the -NH2 bond of the amine group while the band at 1418 cm-1 was attributed to -COObond, these two bands indicated the typical group”
Chitosan Modified Zeolite Molecular Sieve Particles as a Filter for Ammonium Nitrogen Removal from Water DOI: 10.3390/ijms21072383
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