Hvad absorberer ved 400 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 400 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 400 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 |
|---|---|---|---|
| Metal oxygen | 21 | 19 | 1,0 |
| Hydroxyl (O-H) | 15 | 15 | 1,0 |
| Amide | 14 | 14 | 1,0 |
| N h | 12 | 12 | 1,0 |
| Alkyl C-H | 10 | 10 | 1,0 |
| Silicon (Si) | 9 | 8 | 1,0 |
| Methacrylate | 8 | 8 | 1,0 |
| Acetate | 8 | 8 | 1,0 |
| Secondary amine | 8 | 8 | 1,0 |
| N-O bond | 7 | 7 | 1,0 |
| Carboxyl (COOH) | 7 | 5 | 1,0 |
| Silicon-oxygen (Si-O) | 6 | 6 | 1,0 |
| Carbonyl (C=O) | 5 | 5 | 1,0 |
| Water (H2O) | 5 | 5 | 1,0 |
| Methoxy (OCH3) | 5 | 5 | 1,0 |
| C-O single bond | 5 | 5 | 1,0 |
| C n single bond | 4 | 4 | 1,0 |
| Amine primary | 4 | 4 | 1,0 |
| Ammonium | 4 | 4 | 1,0 |
| Ketone | 3 | 3 | 1,0 |
| Ester | 3 | 3 | 1,0 |
| C c single bond | 3 | 3 | 1,0 |
| Methyl | 3 | 3 | 1,0 |
| C=n | 3 | 3 | 1,0 |
| Siloxane (Si-O-Si) | 3 | 3 | 1,0 |
| Carbohydrate | 2 | 2 | 1,0 |
| Phosphate (PO4) | 2 | 2 | 1,0 |
| Metal oxo | 2 | 2 | 1,0 |
| Silanol (Si-OH) | 2 | 2 | 1,0 |
| Silicon silicon | 2 | 2 | 1,0 |
| Nitrogen heterocycle | 1 | 1 | 1,0 |
| Metal hydroxyl | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Protein | 1 | 1 | 1,0 |
| Urethane | 1 | 1 | 1,0 |
| Lignin | 1 | 1 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Carbon dioxide | 1 | 1 | 1,0 |
| Imide | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| Carbonate | 1 | 1 | 1,0 |
| Silicon nitrogen | 1 | 0 | 1,0 |
| Nitride | 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 |
|---|---|---|---|
| graphene oxide | 400, 1150, 3400 | Hydroxyl (O-H) | 1 |
| CeO2 | 400, 1554, 1630 | Hydroxyl (O-H), Metal oxygen | 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 400 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
-
tillid 1,0
“The formation of iron oxide NPs was confirmed with these distinctive peaks in the region between [400 and cm-1 600] where these extended peaks corresponded to iron oxide magnetite Fe 3O 4-NPs [30].”
Effect of Ferric Chloride Concentration on the Type of Magnetite (Fe3O4) Nanoparticles Biosynthesized by Aqueous Leaves Extract of Artemisia and Assessment of Their Antioxidant Activities DOI: 10.1007/s10876-020-01868-7 -
Water (H2O) tillid 1,0
“Secondly, the absorp1700-1600cm-1 tion band in region is attributed to the bend vibration of hygroscopic, adsorbed, bound water or structural 400cm-1 OH.”
Cai 等 - 2007 - A Fourier transform infrared spectroscopic study o DOI: 10.1016/j.saa.2006.02.053 -
Metal oxygen tillid 1,0
“The presence of peak at enceofresidualorganicsinthesample.Asignificantspectroscopic 460cm-1 band at 840, 654, 600 and corresponds to Al-O vibrationwhereasbandat400cm-1 correspondstoCe-Ovibration.The 400cm-1 band at 460 [16] and [17] which a”
Chandradass 等 - 2009 - Effect of different fuels on the alumina-ceria com DOI: 10.1016/j.jallcom.2008.12.119 -
Carbonyl (C=O) tillid 1,0
“in the high frequency region with the most characteristic carbonyl vibrations haveusedthelast400nsofeachreplicatosample328geometriesto highlighted.”
Chenchiliyan 等 - 2023 - Ground-state heterogeneity and vibrational energy DOI: 10.1063/5.0135268 -
Silicon (Si) tillid 1,0
“The weak absorption in the near infrared region (~400 cm-1) of three compounds is ascribed to Si-Si bonds.”
Synthesis, characterization and properties of diamidodisilanes and azocyclosilane DOI: 10.1360/982004-590 -
N-O bond tillid 1,0
“Of the success of the functionalization is further Sample O/C Ratio N/O Ratio revealed by the appearance of a new peak at 400 eV (N1s) (Figure 5a), which is further confirmed by”
Daud 等 - 2017 - Functionalizing Graphene Oxide with Alkylamine by DOI: 10.3390/nano7060135 -
Hydroxyl (O-H) tillid 1,0
“Figure 4 compares, as an example, the O-H stretching bands well-defined composition of the sample under study, the main band measured at 400 °C on the studied sample both in situ and after cm-1 M(1)Fe2+M(1)Fe2+M(3)Fe2+-OH at 3678 is assigne”
Deprotonation of Fe-dominant amphiboles: Single-crystal HT-FTIR spectroscopic studies of synthetic potassic-ferro-richterite DOI: 10.2138/am-2017-5859 -
C c single bond tillid 1,0
“The 400 band assigned to C-C-C bending shows a blue shift during heating, suggesting an increase in conformational disorder, cm-1 band assigned to CH twisting shows a red shift owing to an increase in whereas the 1330 2 the interchain dista”
Hiejima 等 - 2017 - Investigation of the Molecular Mechanisms of Melti DOI: 10.24517/00050382
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