Hvad absorberer ved 1077 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1077 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 1077 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 |
|---|---|---|---|
| Methacrylate | 12 | 12 | 1,0 |
| C-O single bond | 12 | 12 | 1,0 |
| Acetate | 12 | 12 | 1,0 |
| Methoxy (OCH3) | 11 | 11 | 1,0 |
| Silicon-oxygen (Si-O) | 5 | 5 | 1,0 |
| Hydroxyl (O-H) | 4 | 4 | 1,0 |
| Amide | 3 | 3 | 1,0 |
| Alkyl C-H | 3 | 3 | 1,0 |
| Phosphate (PO4) | 3 | 3 | 1,0 |
| Carbohydrate | 3 | 2 | 1,0 |
| Protein | 2 | 2 | 1,0 |
| Carboxyl (COOH) | 2 | 2 | 1,0 |
| Nucleic acid | 2 | 2 | 1,0 |
| Phosphorus | 2 | 2 | 1,0 |
| Silicon (Si) | 2 | 2 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Fatty acid | 1 | 1 | 1,0 |
| Amine primary | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Silanol (Si-OH) | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| N n bond | 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 |
|---|---|---|---|
| starch | 1077, 1650, 1540 | Methacrylate, Acetate, C-O single bond | 1 |
| citric acid | 1077, 1725, 1732 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| PLA | 1077, 1650, 1073 | Methacrylate, Acetate, Methoxy (OCH3) | 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 1077 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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Acetate tillid 1,0
“Finally, the cm-1 steep peak at (ix) 1077 (Figure 3) could be attributable to C-O stretching, which”
Characteristics of Plasticized Lithium Ion Conducting Green Polymer Blend Electrolytes Based on CS: Dextran with High Energy Density and Specific Capacitance DOI: 10.3390/polym13213613 -
Acetate tillid 1,0
“While for corn starch extruded at 127 °C, 20% moisture content, and cm-1 1.5% of citric acid (CSE1) with 0.81 g/100 g of RS, the adsorption bands 1150 and 1077 are attributed to stretch C-O-H or C-O-R of saccharide.”
Optimization of an extrusion cooking process to increase formation of resistant starch from corn starch with addition of citric acid DOI: 10.1002/star.201900150. -
Silicon (Si) tillid 1,0
“of the mineral host elements, the peaks at 670, 753, 960, and 96 0 250 500 750 1000 1250 1500 cm-1 1077 can be related to stretching vibrations associated Temperature/ΟC with a Si-O bond originated from donbassite and quartz impu-”
Parali 等 - 2015 - Dielectric behaviors at microwave frequencies and DOI: 10.1088/1674-1056/24/5/059101 -
Alkyl C-H tillid 1,0
“FTIR spectra of starch typically demonstrates bands at 1100-900 (C-O-H Pre-proof cm-1 bending and stretch vibration), 1100-1150 (C-O, C-C and C-O-H stretching), 840 and cm-1 cm-1 1077 (CH 2-O-CH stretching vibration), 851 (skeletal stretchi”
Pourmohammadi 和 Abedi - 2020 - The effect of pre and post-ultrasonication on the DOI: 10.1016/j.ijbiomac.2020.06.205 -
Alkyl C-H tillid 1,0
“In addition, the peak at 1077 was C-H bending (Bourtoom &”
Characteristics and properties of hydroxypropylated rice starch based biodegradable films DOI: 10.1016/j.foodhyd.2015.04.010 -
Acetate tillid 1,0
“X-ray scatis cm(cid:2)1 C-N bending vibration, the band centered at 1258 to the tering measurements suggest the self-assembling of disordered article cm(cid:2)1 C-O stretching vibration and the sharp band at 1077 to the Article.”
Design of a fluorescent and clickable Ag38(SRN3)24 nanocluster platform: synthesis, modeling and self-assembling DOI: 10.1039/d1na00090j -
N n bond tillid 1,0
“Asad S, Amoozegar M, Pourbabaee AA, Sarbolouki M, Dastgheib S cm-1 cm-1 1238 and peaks at 1077 and 1036 are assigned (2007) Decolorization of textile azo dyes by newly isolated to R-SO groups and -S=O (Sanmuga Priya et al.”
Biodegradation and decolorization of azo dyes by adherent Staphylococcus lentus strain DOI: 10.1007/s13765-016-0169-4 -
Carboxyl (COOH) tillid 1,0
“cm-1-which stretching as 1077 and the C-COO peak at 880 can be associated with CaCO 3 indicated by the peak at 2503 cm-1).”
Impact of the Fused Deposition (FDM) Printing Process on Polylactic Acid (PLA) Chemistry and Structure DOI: 10.3390/app7060579
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