Hvad absorberer ved 966 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 966 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 966 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 | 16 | 14 | 1,0 |
| Alkene (C=C) | 9 | 9 | 1,0 |
| C c single bond | 5 | 5 | 1,0 |
| Nucleic acid | 5 | 4 | 1,0 |
| Methoxy (OCH3) | 4 | 4 | 1,0 |
| Methacrylate | 4 | 4 | 1,0 |
| Acetate | 4 | 4 | 1,0 |
| C-O single bond | 4 | 4 | 1,0 |
| Phosphate (PO4) | 4 | 4 | 1,0 |
| Aromatic ring | 3 | 3 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| Silanol (Si-OH) | 2 | 2 | 1,0 |
| Ammonium | 2 | 1 | 1,0 |
| Fatty acid | 2 | 0 | 1,0 |
| Phospholipid | 1 | 1 | 1,0 |
| Lipid | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Styrene | 1 | 1 | 0,9 |
| N h | 1 | 0 | 1,0 |
| Carboxyl (COOH) | 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 |
|---|---|---|---|
| silica | 966, 1100, 1080 | Alkyl C-H | 2 |
| ZnO | 966, 1400, 3430 | Alkyl C-H | 1 |
| gold nanoparticles | 966, 1638, 3252 | Alkyl C-H | 1 |
| PVC | 966, 834, 1195 | Alkyl C-H | 1 |
| asphalt binder | 966, 1700, 1242 | Alkyl C-H, Alkene (C=C) | 1 |
| asphalt | 966, 1600, 1376 | Alkyl C-H, 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 966 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
-
Alkyl C-H tillid 1,0
“Calibration model was established using the band with a peak point at 966 cm-1 cm-1) trans (990-940 related to C-H out of plane deformation vibration of double bond.”
Prediction of peroxide value in omega-3 rich microalgae oil by ATR-FTIR spectroscopy combined with chemometrics DOI: 10.1016/j.foodchem.2017.01.013 -
Alkyl C-H tillid 1,0
“Trans fats band cm-1), ═C-H infrared radiation poorly and/or when the sample is difficult corresponding to stretch (trans bonds, 966 to prepare by means of the traditional methods and/or when was observed in pure butter and spread.”
Contreras 等 - 2010 - Evaluation of Nano Zinc (ZnO) for Surface Enhancem DOI: 10.1007/s11947-009-0237-4 -
Silanol (Si-OH) tillid 1,0
“Meanwhile, the strong cm-1 cm-1 peak at 966.2 informs bending and stretching vibrations of Si-OH bonds.”
Green synthesis and characterization of UKMRC-8 rice husk-derived mesoporous silica nanoparticle for agricultural application DOI: 10.1038/s41598-022-24484-z -
Nucleic acid tillid 1,0
“However, the bands at 966 and 833 which were associated with the backbone of DNA, disappeared in Fig.”
A novel FTIR discrimination based on genomic DNA for species-specific analysis of meat and bone meal DOI: 10.1016/j.foodchem.2019.05.088 -
Silanol (Si-OH) tillid 1,0
“While, absorption at 834 shows the Si-O-Si asymmetric of silanol (Si-OH) at 966 cm-1 there were absorption stretching [24].”
Ismail 等 - 2015 - Effect of Radiation on Properties of ENRPVCSiO2 DOI: 10.1063/1.4931308 -
Amide tillid 1,0
“However, peaks at 1475.00 2 (C-N cm-1 by AuNP-based diffuse reflectance FTIR spectroscopy scissoring vibration) and 965.96 stretching vibration) were also found as characteristic peaks for CTAB.”
Citrate-capped gold nanoparticles as a sensing probe for determination of cetyltrimethylammonium surfactant using FTIR spectroscopy and colorimetry DOI: 10.1007/s00216-019-02067-8 -
Alkene (C=C) tillid 1,0
“The strong peak at 966 indicates TOR has a great amount of double bonds.”
Liang 等 - 2017 - Thermo-stability and aging performance of modified DOI: 10.1016/j.matdes.2017.04.060 -
Hydrogen bond tillid 1,0
“The 1450 and 2920 wavenumbers show cm-1 hydrogen bonding (C-H), but the best characteristics of SBS are shown at the 966 peaks of carbon-hydrogen bonding (C-H), but the best characteristics of SBS are shown at peaks of carbon-hydrogen bondi”
Analysis of the Properties of Modified Asphalt Binder by FTIR Method DOI: 10.3390/ma15165743
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