Hvad absorberer ved 1627 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1627 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 1627 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 |
|---|---|---|---|
| Amide | 22 | 20 | 1,0 |
| Carboxyl (COOH) | 13 | 11 | 1,0 |
| Methacrylate | 12 | 11 | 1,0 |
| Acetate | 12 | 11 | 1,0 |
| Carbonyl (C=O) | 12 | 11 | 1,0 |
| Alkene (C=C) | 9 | 8 | 1,0 |
| N h | 9 | 8 | 1,0 |
| Ketone | 8 | 7 | 1,0 |
| Ester | 8 | 7 | 1,0 |
| Hydroxyl (O-H) | 5 | 5 | 1,0 |
| C-O single bond | 5 | 5 | 1,0 |
| Alkyl C-H | 5 | 5 | 1,0 |
| Secondary amine | 5 | 4 | 1,0 |
| Methoxy (OCH3) | 4 | 4 | 1,0 |
| Aromatic ring | 4 | 3 | 1,0 |
| C n single bond | 3 | 3 | 1,0 |
| C=n | 3 | 3 | 1,0 |
| Protein beta sheet | 3 | 2 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| Water (H2O) | 2 | 2 | 1,0 |
| Silicon (Si) | 2 | 2 | 1,0 |
| Siloxane (Si-O-Si) | 2 | 2 | 1,0 |
| Aldehyde (CHO) | 1 | 1 | 1,0 |
| Protein | 1 | 1 | 1,0 |
| Carbon dioxide | 1 | 1 | 1,0 |
| Protein alpha helix | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 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 |
|---|---|---|---|
| pectin | 1627, 1746, 1150 | Methacrylate, Acetate, Carboxyl (COOH) | 1 |
| ZnO NPs | 1627, 1664, 875 | Amide, Methacrylate, Acetate | 1 |
| CdS | 1627, 1375, 1092 | Methacrylate, Acetate | 1 |
| calcium phosphate | 1627, 1070, 1149 | Methacrylate | 1 |
| alginate | 1627, 1100, 1715 | Methacrylate, Acetate, Carboxyl (COOH) | 1 |
| epoxy | 1627, 1660, 1735 | Methacrylate, Acetate, 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 1627 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
-
Hydroxyl (O-H) tillid 1,0
“Meanwhile, a moderately sharp peak emerged cm-1 at 1627 corresponds to the hydroxyl (O-H) bending vibrational mode [32].”
Aziz 等 - 2023 - Water remediation capability of cubic-phase CdS na DOI: 10.15251/DJNB.2023.181.203 -
Carbonyl (C=O) tillid 1,0
“cm-1 and 2856 are characteristic stretch, two bands at 2933 viewed at wileyonlinelibrary.com] ─CH ─CH of aliphatic asymmetric and symmetric stretching of 2 cm-1 verified groups, and the amidic carbonyl stretch at 1627 the”
Influence of amine‐terminated additives on thermal and mechanical properties of diglycidyl ether of bisphenol A (DGEBA) cured epoxy DOI: 10.1002/app.48404 -
Acetate tillid 1,0
“cm-1, the monomers of both gums, as well as the bands present at 1627 and 1409 which are related to The band on the scaffold spectrum at 1149 cm-1 is derived from the C-O type bonds present in the monomers of both gums, as well as the bands”
Development of Composite Scaffolds Based on Cerium Doped-Hydroxyapatite and Natural Gums—Biological and Mechanical Properties DOI: 10.3390/ma12152389 -
C=n tillid 1,0
“cm-1, For quantification, absorbance of C=O stretch cantered at 1754 between wave number of 1750 - cm-1 cm-1, 1730 was selected for Aspirin and absorbance of C=N stretch cantered at 1627 between 1690 cm-1 - 1620 was used for Omeprazole.”
Chandarana 和 Kapupara - 2020 - Fourier Transform Infrared Spectrophotometry An E DOI: 10.30744/brjac.2179-3425.AR-25-2020 -
Amide tillid 1,0
“The FTIR spectrum of extracellular mycosynthesis of ZnO NPs by Alternaria alternata cm-1 showed the absorption band at 1627 corresponding to the amide I of polypeptides [18].”
An Investigation of the Cytotoxicity and Caspase-Mediated Apoptotic Effect of Green Synthesized Zinc Oxide Nanoparticles Using Eclipta prostrata on Human Liver Carcinoma Cells DOI: 10.3390/nano5031317 -
Carbonyl (C=O) tillid 1,0
“The band at 1627 was Lathyrus sativus peel extract could be conceptualized by the following (C-- ascribed due to the carbonyl group O) of carboxylic acid (capping reaction Scheme 1 proposed by (Awwad and Salem, 2012) and (Ramesh cm(cid:0) 1”
Green synthesis of magnetite nanoparticles using Lathyrus sativus peel extract and evaluation of their catalytic activity DOI: 10.1016/j.clet.2021.100117 -
Acetate tillid 1,0
“Moreover, the peak at 1627 corresponds to -C=O cm-1 should be a sign of the excess of GA [18] and the disappearance of peak at 1400 for -CH and -CH”
Hendrawanh 等 - 2019 - Poly (vinyl alcohol)glutaraldehydePremna oblongi DOI: 10.1088/1757-899X/509/1/012048 -
Carboxyl (COOH) tillid 1,0
“Stronger to carboxyl ion stretching band Cumolative intensity of ester carbonyl peak at 1746 compared to 40 free carboxyl band at 1627 indicated an increase in the”
Nisinloaded alginatehigh methoxy pectin microparticles: preparation and physicochemical characterisation DOI: 10.1111/ijfs.12516
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