Hvad absorberer ved 1517 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1517 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 1517 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 |
|---|---|---|---|
| Aromatic ring | 8 | 8 | 1,0 |
| Amide | 8 | 6 | 1,0 |
| Alkyl C-H | 5 | 4 | 1,0 |
| Methacrylate | 4 | 4 | 1,0 |
| C-O single bond | 4 | 4 | 1,0 |
| Acetate | 4 | 4 | 1,0 |
| Alkene (C=C) | 4 | 3 | 1,0 |
| Methoxy (OCH3) | 3 | 3 | 1,0 |
| Carboxyl (COOH) | 3 | 3 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Ketone | 2 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Carbonyl (C=O) | 2 | 2 | 1,0 |
| N-O bond | 2 | 2 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| N h | 2 | 2 | 1,0 |
| Lignin | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| C=n | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| Amino acid | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 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 |
|---|---|---|---|
| hydroxyapatite | 1517, 1620, 1639 | Alkyl C-H, Methacrylate, Amide | 1 |
| silver nanoparticles | 1517, 1636, 1631 | Alkyl C-H, Methacrylate, Amide | 1 |
| quercetin | 1517, 1745, 1612 | Methacrylate, Alkyl C-H, 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 1517 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
“[20] reported that phenolic acid bands including ferulic acid are divided primarily into an absorption band, which showed strong cm-1, aromatic ring vibration at 1517 and secondary absorption bands 1690, 1620 and”
Biochemical and Structural Characterization of Ferulated Arabinoxylans Extracted from Nixtamalized and Non-Nixtamalized Maize Bran DOI: 10.3390/foods11213374 -
Amide tillid 1,0
“tivearomaticpeaks.Thisisespeciallyimportantinthecaseofthetyrocm-1 (Barth and Zscherp, 2002) and sine peak, which occurs at 1517 1.5 1.5 height OH therefore cannot be separated out as easily as the amide II band.”
Shedding light on sporopollenin chemistry, with reference to UV reconstructions DOI: 10.1016/j.revpalbo.2016.11.014 -
Water (H2O) tillid 1,0
“The broad peak at 1517 cm-1 indicates the AC adsorption of water on the coated samples.”
Novel synthesis of bioactive hydroxyapatite/f-multiwalled carbon nanotube composite coating on 316L SS implant for substantial corrosion resistance and antibacterial activity DOI: 10.1016/j.jallcom.2018.10.341 -
Alkyl C-H tillid 1,0
“Peaks seemingly due to O-H stretch appeared at 3460 cm-1, cm-1, C-H stretch (aromatic) at 2915 C=O stretch due to vinyl acetate at 1730 C=O at 1727 cm-1, 1610 cm-1, 778 cm-1, 1517 cm-1, and 756 cm-1 corresponds to crystalline form”
How to Improve Solubility and Dissolution of Irbesartan by Fabricating Ternary Solid Dispersions: Optimization and In-Vitro Characterization DOI: 10.3390/pharmaceutics14112264 -
S eq o tillid 1,0
“It was found that the pal peaks belonging to measure functional group such smallest particle size was observed in batch P1 as com1064cm-1 1517cm-1 as (S=O stretching), (N-H stretchpared to other formulations.”
Giri 等 - 2019 - Hydrochlorothiazide Nanocrystals Stabilization by DOI: 10.5530/ijper.53.3.81 -
N-O bond tillid 1,0
“Qn-AgNPs was not as strong as Qn in general, and characteristic peaks were observed cm-1, cm-1, cm-1), cm-1), in C=C stretching (1653 1599 815 N-O stretching (1517 and cm-1) C-O stretching (1163 related to the Qn which might exist on the su”
Synthesis of Biomolecule Functionalized Biocompatible Silver Nanoparticles for Antioxidant and Antibacterial Applications DOI: 10.3390/coatings12091292 -
Amino acid tillid 1,0
“Interestingly, the Tyrosine band at ~1517”
Biomacromolecular Profile in Human Primary Retinal Pigment Epithelial Cells—A Study of Oxidative Stress and Autophagy by Synchrotron-Based FTIR Microspectroscopy DOI: 10.3390/biomedicines11020300 -
N h tillid 1,0
“1571 1571 1573 Proteins CH3 and CH2 deformations 1472 1474 1474 1472 Lipid Proteins NH bend + C-N stretch Amide residues 1517 1515 1515 1515 Tyrosine Proteins Colored shapes represent the assigned biomolecules, which can be correlated with”
Comprehensive Evaluation of PAXgene Fixation on Oral Cancer Tissues Using Routine Histology, Immunohistochemistry, and FTIR Microspectroscopy DOI: 10.3390/biom11060889
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