Hvad absorberer ved 699 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 699 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 699 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 | 8 | 8 | 1,0 |
| Aromatic ring | 6 | 6 | 1,0 |
| Ring structure | 4 | 4 | 1,0 |
| Alkene (C=C) | 3 | 3 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1,0 |
| Anhydride | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Chlorine | 1 | 1 | 1,0 |
| Oxygen heterocycle | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Styrene | 1 | 1 | 0,9 |
| Metal oxygen | 1 | 1 | 0,8 |
| C c single bond | 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 |
|---|---|---|---|
| Polystyrene | 699, 1020, 1600 | Aromatic ring, Alkyl C-H | 1 |
| TiO2 | 699, 1700, 1093 | Alkyl C-H | 1 |
| SiO2 | 699, 1739, 695 | Alkyl C-H | 1 |
| MgO | 699, 874, 467 | Alkyl C-H | 1 |
| TiO | 699, 1730, 1699 | Alkyl C-H | 1 |
| asphalt binder | 699, 1700, 1242 | Alkyl C-H, Aromatic ring, Alkene (C=C) | 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 699 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
-
Silicon (Si) tillid 1,0
“699cm-1, centhydrocarbonchainsandthesplitismorepronouncedatlower the Due to the strong peak of Si-O-Al bending at 730cm-1 temperature with an orthorhombic subcell [28].”
Li 等 - 2008 - An FTIR investigation of hexadecyltrimethylammoniu DOI: 10.1016/j.saa.2008.05.015 -
Acetate tillid 1,0
“The bands at 1254 is assigned to asymmetric vibration of C-O-C while cm-1 are indicating the presence of C-O-C (epoxy ring) vibration and C-Cl of the absorption peaks at 874 and 699 cm-1 PVC, respectively [6].”
Nor 等 - 2013 - Gas Permeability of ENRPVC Membrane with the Addi DOI: 10.1063/1.4858770 -
Alkyl C-H tillid 1,0
“The peak at 699 cm-1 performed with high resolution (R = 5000, 10 % corresponds to the C-H out-of-plane deformation valley), in the peak matching mode, with PFK ions for specific to an aromatic ring [15].”
Tosa 等 - 2012 - Simultaneous Determination Of Some Artificial Swee DOI: 10.1063/1.3681976 -
Aromatic ring tillid 1,0
“cm-1 Additionally, the FTIR spectra are similar except for some bands, such as the one at 699 Additionally, the FTIR spectra are similar except for some bands, such as the one at 699 cm-1 which is characteristic of the out-of-plane skeleton”
Sulfonated Polystyrene Nanoparticles as Oleic Acid Diethanolamide Surfactant Nanocarriers for Enhanced Oil Recovery Processes DOI: 10.3390/polym11091513 -
S eq o tillid 1,0
“and 699 The stretching vibration of sulfoxide S=O functional group appeared at”
Research on the Interaction Capability and Microscopic Interfacial Mechanism between Asphalt-Binder and Steel Slag Aggregate-Filler DOI: 10.3390/coatings12121871 -
Alkyl C-H tillid 1,0
“Lastly, the band that appears at 699 is associated with the out-of-plane bending of the C-H group in monosubstituted aromatic rings [52].”
Lima 等 - 2022 - Asphalt Binder Skincare Aging Evaluation of an DOI: 10.3390/nano12101678 -
Aromatic ring tillid 1,0
“The peaks that appear between 910 cm-1 and 699 cm-1 can be analyzed carefully to show ortho-, metaand paradisubstituted rings presented in aromatic compounds and are associated with out-of-plane C-H bending vibrations in this structure.”
Physicochemical and Rheological Properties of a Transparent Asphalt Binder Modified with Nano-TiO2 DOI: 10.3390/nano10112152 -
Alkene (C=C) tillid 1,0
“It can also be seen that the increased from 0.25 L/min to 1 L/min, newly-formed characteristic absorption bands appeared at characteristic band of C=C at 967 and 699 cm-1 became weak, which indicates that the increasing cm-1, nearly 3446, 1”
Investigation of Molecular Structure and Thermal Properties of Thermo-Oxidative Aged SBS in Blends and Their Relations DOI: 10.3390/ma10070768
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