Hvad absorberer ved 1660 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1660 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 1660 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 | 93 | 79 | 1,0 |
| Carbonyl (C=O) | 51 | 45 | 1,0 |
| Methacrylate | 32 | 28 | 1,0 |
| Acetate | 32 | 28 | 1,0 |
| Carboxyl (COOH) | 29 | 25 | 1,0 |
| Ester | 27 | 23 | 1,0 |
| Ketone | 26 | 22 | 1,0 |
| N h | 14 | 13 | 1,0 |
| Secondary amine | 12 | 12 | 1,0 |
| Alkene (C=C) | 9 | 9 | 1,0 |
| Protein | 8 | 8 | 1,0 |
| Methoxy (OCH3) | 8 | 7 | 1,0 |
| C-O single bond | 8 | 7 | 1,0 |
| Hydroxyl (O-H) | 7 | 7 | 1,0 |
| C n single bond | 7 | 7 | 1,0 |
| Protein alpha helix | 7 | 6 | 1,0 |
| Protein beta turn | 5 | 5 | 1,0 |
| Hydrogen bond | 4 | 4 | 1,0 |
| Alkyl C-H | 3 | 3 | 1,0 |
| Lignin | 2 | 2 | 1,0 |
| Ammonium | 2 | 2 | 1,0 |
| Protein random coil | 2 | 2 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| Carbohydrate | 2 | 2 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| Water (H2O) | 2 | 2 | 1,0 |
| C=n | 2 | 1 | 1,0 |
| Carbonate | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Nucleic acid | 1 | 1 | 1,0 |
| Sulfate (SO4) | 1 | 1 | 1,0 |
| Chitosan | 1 | 1 | 1,0 |
| Protein beta sheet | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Amine primary | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Bromine | 1 | 1 | 1,0 |
| Oxygen heterocycle | 1 | 1 | 0,6 |
| Phosphorus | 1 | 0 | 1,0 |
| Phosphate (PO4) | 1 | 0 | 1,0 |
| Imide | 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 |
|---|---|---|---|
| epoxy | 1660, 1735, 1035 | Methacrylate, Acetate, Amide | 1 |
| PANI | 1660, 2930, 1300 | 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 1660 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
-
N h tillid 1,0
“PG100 film at 2856 The carbonyl C=O double bond stretching mode dominates the amide I band, with contributions from the CN stretch, CCN deformation and in-plane NH bending modes and is mostly found in the region of 1660 cm-1 to 1620 cm-1, w”
Application of Poultry Gelatin to Enhance the Physicochemical, Mechanical, and Rheological Properties of Fish Gelatin as Alternative Mammalian Gelatin Films for Food Packaging DOI: 10.3390/foods12030670 -
Bromine tillid 1,0
“cm-1is (cid:3) at 1435 assigned to the 4(F) bending mode of Brönsted acid (cid:3) bound ammonium ions [49,51,53], but the corresponding sites 2 cm-1 (E) vibration mode is absent at 1660 [59].”
Low-temperature selective catalytic reduction of NO with NH3 over V/ZrO2 prepared by flame-assisted spray pyrolysis: Structural and catalytic properties DOI: 10.1016/j.apcatb.2012.08.012 -
Alkene (C=C) tillid 1,0
“The band at 1660 can be attributed to the -C=Cstretching vibration of alkenes cm-1 [36].”
Mesoporous magnetite nanoparticles synthesis using the Peltophorum pterocarpum pod extract, their antibacterial efficacy against pathogens and ability to remove a pollutant dye DOI: 10.1016/j.molstruc.2018.10.042 -
Carbonyl (C=O) tillid 1,0
“Young and Chang [15] studied the FTIR changes of PMR-15 after thermal spiking and also observed this change along with the ingrowth cm(cid:2)1, of peaks at 1660 and 930 both arising from the bridging carbonyl group.”
Fox 等 - 2004 - Investigation of failure mechanisms in aged aerosp DOI: 10.1016/j.engfailanal.2003.05.010 -
Alkene (C=C) tillid 1,0
“The intense FT-IR peaks at cm-1 1660 and 3461 of GQDs spectrum reveals the presence of a C=C and an O-H stretching, in that order.”
Gebreegziabher 等 - 2020 - Polyaniline-graphene quantum dots (PANI-GQDs) hybr DOI: 10.1007/s42823-019-00064-6 -
Acetate tillid 1,0
“The first was at 1717 which cm-1 refers to (C O) group of a free aldehyde end of glutaraldehyde, and another peak was at 1660 Keywords: referring to (C N ) group.”
Covalent immobilization of Enterococcus faecalis Esawy dextransucrase and dextran synthesis DOI: 10.1016/j.ijbiomac.2015.09.076 -
Amide tillid 1,0
“Moreover, the FTIR Electron irradiation cm-1, spectra showed higher intensities of the peaks at 1660 and 1720 which are attributed to stretching rate effect Dose vibrations of amide C O and ketone/acid C O, at lower dose rates.”
Dose rate effects on shape memory epoxy resin during 1 MeV electron irradiation in air DOI: 10.1016/j.jmst.2020.06.020 -
Amide tillid 1,0
“The peaks at 1692 1687 (-) cm-1 77 and 100 K are enlarged by 1/0.36 and 1/0.64, respectively, and 1673 can be attributed to the amide I vibrations (+) (-) to normalize the population of D447 photoconverted to S390 of turn structure, and the”
Iwata 等 - 2003 - Light-induced structural changes in the LOV2 domai DOI: 10.1021/bi0345135
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