Hvad absorberer ved 1397 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1397 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 1397 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 |
|---|---|---|---|
| Methacrylate | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| Alkyl C-H | 3 | 3 | 1,0 |
| C-O single bond | 3 | 3 | 1,0 |
| Carboxyl (COOH) | 3 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Amide | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| Carbonate | 2 | 1 | 1,0 |
| C=n | 1 | 1 | 1,0 |
| Protein | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Lipid | 1 | 0 | 1,0 |
| N n bond | 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 |
|---|---|---|---|
| ZnO | 1397, 1400, 3430 | Alkyl C-H, Acetate, Methacrylate | 1 |
| nanoparticles | 1397, 1732, 1647 | Alkyl C-H, C-O single bond, Methacrylate | 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 1397 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
“90 cm-1 peaks at 1547 and 1502 represents the C O and loss cm-1 spectrum.28 C O in the The IR bands at 1397 Weight 85 group.28 is assigned to the carbonate The bands correcm-1 (cid:6) sponding to stretching frequency centered at 1050”
Hadia 等 - 2014 - Effect of the Temperature on Structural and Optica DOI: 10.1166/jnn.2014.8861 -
Aromatic ring tillid 1,0
“Materials Science in Semiconductor Processing 96 (2019) 104-115 1397cm-1 are assigned to the C˭C vibration in aromatic ring and”
Effect of co-sensitization in solar exfoliated TiO2 functionalized rGO photoanode for dye-sensitized solar cell applications DOI: 10.1016/j.mssp.2019.02.027 -
C-O single bond tillid 1,0
“There were significant differences in the absorption band areas of the bands located in cm-1 cm-1 cm-1 the regions of 1087 (C-OH stretching), 1397 (CH from proteins and lipids), 1543 3 cm-1”
Mostaco-Guidolin 等 - 2010 - Molecular and chemical characterization by Fourier DOI: 10.3233/SPE-2010-0466 -
Carboxyl (COOH) tillid 1,0
“The results of TLC analysis indicated that purified EPSs cm-1, A peak at 1397 which is due to the carboxyl L.”
Optimization of food-grade medium for co-production of bioactive substances by Lactobacillus acidophilus LA-5 for explaining pharmabiotic mechanisms of probiotic DOI: 10.1007/s13197-020-04894-5 -
tillid 1,0
“ber 1396.84 Similarly, N-H stretch of amide in PA solid state interactions between PA and IB, and partial disIB.28 cm-1 The details of % crystallinity at 3162.69 was also shifted to higher wave number.”
Bhandari 等 - 2018 - Co-Amorphization of Ibuprofen by Paracetamol for I DOI: 10.17344/acsi.2017.3822 -
Amide tillid 1,0
“Comparing the three infrared spectra in Figure 2A, the newly generated peak at 1397 is the cm-1 stretching vibration peak of the C-N-C bond and the peak at 1167 is the stretching vibration peak of the C-N in the amide bond (curve c in Figur”
Inhibition of Poly(ethylenediaminetetraacetic acid-diethanolamine) on Deposition of Calcium Sulfate Crystal in Simulated Industrial Water DOI: 10.3390/cryst10060544 -
Alkyl C-H tillid 1,0
“N-H 725 bending vibration 1371 CH bending vibration 1397 CH bending vibration 2 2”
Cheng 等 - 2022 - Development of a High-Strength and Adhesive Polyac DOI: 10.1021/acsomega.1c06626 -
Alkyl C-H tillid 1,0
“The peaks at 1397 and 1017 were attributed to the characteristic absorption bands of the CH groups.”
Du 等 - 2020 - Synthesis, Property and Mechanism Analysis of a No DOI: 10.3390/min10020128
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