Hvad absorberer ved 1445 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1445 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 1445 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 | 12 | 10 | 1,0 |
| Amide | 8 | 8 | 1,0 |
| Acetate | 7 | 6 | 1,0 |
| Methacrylate | 6 | 6 | 1,0 |
| Carboxyl (COOH) | 4 | 4 | 1,0 |
| Aromatic ring | 4 | 4 | 1,0 |
| Methoxy (OCH3) | 4 | 4 | 1,0 |
| Secondary amine | 4 | 4 | 1,0 |
| Nitrogen heterocycle | 4 | 4 | 1,0 |
| Lewis acid site | 4 | 3 | 1,0 |
| C-O single bond | 3 | 3 | 1,0 |
| Alkene (C=C) | 3 | 3 | 1,0 |
| Hydroxyl (O-H) | 3 | 3 | 1,0 |
| N h | 3 | 3 | 1,0 |
| Ketone | 2 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Carbonyl (C=O) | 2 | 2 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| C n single bond | 2 | 2 | 1,0 |
| Methyl | 2 | 2 | 1,0 |
| Lignin | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Isocyanate | 1 | 1 | 1,0 |
| C=n | 1 | 1 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Amine primary | 1 | 1 | 1,0 |
| Lipid | 1 | 1 | 1,0 |
| Carbonate | 1 | 1 | 1,0 |
| Protein | 1 | 1 | 1,0 |
| Bronsted acid site | 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 |
|---|---|---|---|
| Nanotubes | 1445, 1735, 1630 | Alkyl C-H, Methacrylate, Acetate | 1 |
| TiO2 | 1445, 1700, 1093 | Alkyl C-H, Methacrylate, Acetate | 1 |
| dentin | 1445, 575, 1740 | Amide, 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 1445 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
“LLM confirmed rule peak-group candidate”
Azmina 等 - 2012 - Preparation of Palm Oil Based Carbon Nanotubes at DOI: 10.4028/www.scientific.net/AMR.364.408 -
Protein tillid 1,0
“shows anincrease in collagen thata bandarearatio, 1665/1445 cm-1 Defining band area ratios content, while the decrease in the 1665/1445 changes in FTIR spectra of liquid samples is crucial to disfluids meanstheimpairedcollagendepositioninin”
The role of topically applied l-ascorbic acid in ex-vivo examination of burn-injured human skin DOI: 10.1016/j.saa.2017.05.055 -
tillid 1,0
“839, 1243, 1445, 1673 and 1726 The vibrational mode at the in-plane stretching and swinging of the N H, C H, and C O cm-1 cm-1 839 is derived from the out-of-plane swinging of the C O bonds.”
A comparative study on the experimental and calculated results of mid-infrared and Raman vibrational modes of nucleic acid bases DOI: 10.1016/j.jmgm.2017.04.016 -
Alkyl C-H tillid 1,0
“And bands identified at 1445 and 1500 were attributed to CH group.”
Yadav 等 - 2021 - Evaluation of tire derived rubber (TDR) fixed biof DOI: 10.1080/09593330.2020.1737736 -
tillid 1,0
“All the catalysts exhibited tained after pyridine adsorption on TiO dehydrated at 150 °C, then vacuum treated at cm-1 250 2 bands at 1445 and 1610 that correspond to the vibrations characteristic of pyridine ambient temperature and 150 °C,”
TiO2 Catalyzed Dihydroxyacetone (DHA) Conversion in Water: Evidence That This Model Reaction Probes Basicity in Addition to Acidity DOI: 10.3390/molecules27238172 -
Carbonate tillid 1,0
“The 1445 peak corresponds to the carbonate band (23).”
Abreu 等 - 2016 - Effect of Non-Thermal Argon Plasma on Bond Strengt DOI: 10.1590/0103-6440201600914 -
Acetate tillid 1,0
“cm-1 (stretching), 3065 due to = C-H (aromatic stretching), 2984 and 2950 due to C-H cm-1 cm-1 (stretching), 1696 due to C=O (stretching vibration), 1615 and 1488 due to C=C cm-1 cm-1 (ring stretching), 1445 due to CH3 (stretching), 1303 an”
Adam 等 - 2022 - Comparative Evaluation of Amlodipine Besylate Gene DOI: 10.14227/DT290422PGC2 -
Hydroxyl (O-H) tillid 1,0
“NH3 deformation in amino acids appeared at 1534 cm-1 and the band in 1445 cm-1 cm´1, can be associated with the in-plane -OH bending vibration in carboxylic acids.”
Biosorption of B-aflatoxins Using Biomasses Obtained from Formosa Firethorn [Pyracantha koidzumii (Hayata) Rehder] DOI: 10.3390/toxins8070218
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