Hvad absorberer ved 1628 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1628 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 1628 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 | 18 | 18 | 1,0 |
| Hydroxyl (O-H) | 16 | 15 | 1,0 |
| Methacrylate | 12 | 12 | 1,0 |
| Acetate | 12 | 12 | 1,0 |
| Protein beta sheet | 11 | 11 | 1,0 |
| Water (H2O) | 11 | 9 | 1,0 |
| N h | 10 | 10 | 1,0 |
| Carboxyl (COOH) | 9 | 9 | 1,0 |
| Carbonyl (C=O) | 9 | 9 | 1,0 |
| Alkyl C-H | 9 | 9 | 1,0 |
| Ester | 8 | 8 | 1,0 |
| Ketone | 7 | 7 | 1,0 |
| Methoxy (OCH3) | 6 | 6 | 1,0 |
| Alkene (C=C) | 6 | 6 | 1,0 |
| Secondary amine | 5 | 5 | 1,0 |
| C n single bond | 4 | 4 | 1,0 |
| Aromatic ring | 4 | 4 | 1,0 |
| C-O single bond | 4 | 4 | 1,0 |
| C c single bond | 3 | 3 | 1,0 |
| Amino acid | 2 | 2 | 1,0 |
| Hydrogen bond | 2 | 1 | 1,0 |
| Ring structure | 2 | 1 | 1,0 |
| Lipid | 1 | 1 | 1,0 |
| Protein random coil | 1 | 1 | 1,0 |
| Protein alpha helix | 1 | 1 | 1,0 |
| Amine primary | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| C=n | 1 | 1 | 1,0 |
| N c o | 1 | 1 | 1,0 |
| Protein | 1 | 1 | 1,0 |
| Urea | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Oxygen heterocycle | 1 | 1 | 0,8 |
Rangering afspejler akkumuleret litteraturevidence, ikke en enkelt fast regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| copper oxide | 1628, 624, 1686 | Hydroxyl (O-H), Methacrylate, Amide | 1 |
| PMMA | 1628, 1722, 1383 | Methacrylate, Acetate | 1 |
| iron oxide nanoparticles | 1628, 2972, 528 | Hydroxyl (O-H), 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 1628 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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Hydroxyl (O-H) tillid 1,0
“Obvious Fourier transform infrared cm-1, cm-1, (FTIR) spectra for the GT extract were observed, showing absorption bands at 3401 1628 cm-1, and 1029 corresponding to O-H/N-H, C=O, and C-O groups, respectively.”
Aziz 等 - 2017 - From Insulating PMMA Polymer to Conjugated Double DOI: 10.3390/polym9110626 -
tillid 1,0
“The cm-1 180 peaks around 1628, 1512, 1384, 1258, 1028 and 688 indicating the possible presence of 181 N-H bend, C-C, C-H, C-N stretch and =C-H groups of amines, aromatics, alkanes, and 182 aliphatic amines (Irshad et al., 2017;”
Bio-inspired synthesis of flower shaped iron oxide nanoparticles (FeONPs) using phytochemicals of Solanum lycopersicum leaf extract for biomedical applications DOI: 10.1016/j.bcab.2020.101698 -
Hydroxyl (O-H) tillid 1,0
“The peak at 1710 was standard[24] according to the ASTM from the data attributed to the C = O stretching vibrations in the of three-point bend test at 1 month storage time by cm-1 carboxylic group and the peak at 1628 was drawing a tangent”
Fareed 和 Stamboulis - 2014 - Nanoclay addition to a conventional glass ionomer DOI: 10.4103/1305-7456.143619 -
Hydroxyl (O-H) tillid 1,0
“centered at 3425 The absorption peaks centered at cm-1 1628 and 1384 is ascribed to O-H bending vibrations on the surface of nano-composite.”
Photo-catalytic activity of highly efficient binary Mn–Fe nano composite oxides for degradation of cresol fast violet: phase formation and band gap study DOI: 10.1007/s10854-017-7206-x -
Carboxyl (COOH) tillid 1,0
“The band at 1627.92 indicates the presence of a -COOH group cm-1 and the band on 1519.91 indicate of -NH group.”
Hastuti 和 Assya'adha - 2020 - Synthesis and Characterization of Chitosan Membran DOI: 10.1088/1757-899X/833/1/012068 -
Alkene (C=C) tillid 1,0
“The absorption bands situated at about 1628 and of wavelength were assigned to the C=C as well as O-H stretching vibrational movements.”
Jing 等 - 2019 - Biosynthesis of copper oxide nanoparticles and the DOI: 10.1016/j.jphotobiol.2019.111557 -
Water (H2O) tillid 1,0
“cm-1 well equivalent with the rutile structure of SnO The band at 1628 may be due to the bending 2 There are new diffraction peaks observed with the values of vibration of the hydrogen-bonded water molecules within the”
Hybrid structure of biotemplate-zinc-tin oxide for better optical, morphological and photocatalytic properties DOI: 10.1088/1361-6641/aa577c -
Water (H2O) tillid 1,0
“3 A (3) C OeH In IR spectrum the stretching and deformation vibration peaks 1628cm-1 assigned at 3430 and are due to the adsorbed water moleis the absorbance control, and A is the sample absorWhere, A C S”
Green synthesis of ionic liquid assisted ytterbium oxide nanoparticles by Couroupita guianensis abul leaves extract for biological applications DOI: 10.1016/j.jece.2020.103992
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