Methoxy (OCH3) — FTIR-absorptions-toppe og tildelinger

Hurtigt svar

Methoxy (OCH3) tildeles normalt ved at lede efter en tilbagevendende klynge af karakteristiske toppe frem for et præcist lærebogsnummer. Tabellen nedenfor viser, hvor litteraturen oftest placerer denne gruppe i FTIR, rangeret efter akkumuleret evidens.

Karakteristiske FTIR-toppe for Methoxy (OCH3)

Viser de 30 bedst understøttede toppe ud af 1369 i alt for Methoxy (OCH3).

Mulige materialer

Spektrumlogik

En funktionel gruppetildeling bliver mere sikker, når flere forventede bånd optræder sammen. Brug denne side til at finde de bedst understøttede peaks, og bekræft derefter, at den samme prøve udviser et sammenhængende mønster snarere end et enkelt isoleret hit.

Anvendelse i virkeligheden

Disse sider er nyttige til analyse af ukendte materialer, topforklaring i rapporter, polymerfejlfinding og verifikation af, om en kandidatmaterialefamilie er kemisk plausibel.

Almindelige fejl

• Brug af én funktionel-gruppe-side som en komplet materialebedømmelse uden at kontrollere resten af spektret.
• Antager, at det stærkeste bånd altid er det mest diagnostiske.
• At glemme, at forarbejdning, tilsætningsstoffer, ældning og blandinger kan flytte eller udvide forventede toppe.

Verifikationsrådgivning

Brug DSC, GC-MS eller TGA, når flere materialefamilier deler lignende bånd, eller når blandings-effekter gør FTIR-tildelingen usikker.

Litteratur bag disse tildelinger

• 853 cm⁻¹ tillid 1,0

  “In ATMC the 1289cm-1 ringbreathingmodeisobservedat853cm-1 1351 and corresponds to the C O stretching mode.”

  Arjunan 等 - 2007 - Fourier transform infrared and Raman spectral assi DOI: 10.1016/j.saa.2006.09.044
• 1027 cm⁻¹ tillid 1,0

  “1137 C-O stretching (ST) 1027 carbohydrate 939”

  Artemisia 等 - 2019 - The Properties of Brown Marine Algae Sargassum tur DOI: 10.14499/indonesianjpharm30iss1pp43
• 1037 cm⁻¹ tillid 1,0

  “From FTIR cm(cid:0) 1 C-O-C analysis, observed peaks around 1037 represented the stretching vibrations of the saccharide found in pectin and glycerol.”

  Optimization of citron peel pectin and glycerol concentration in the production of edible film using response surface methodology DOI: 10.1016/j.heliyon.2023.e13724
• 1053 cm⁻¹ tillid 1,0

  “cm-1 to the peak intensity which can be observed in 1312 The region at 1053 corresponds to -C-O-C stretching bonds whereas the spectra with wavenumber below cm-1”

  Synthesis and Characterization of Zinc Oxide Nanoparticles Using Acacia caesia Bark Extract and Its Photocatalytic and Antimicrobial Activities DOI: 10.3390/catal11121507
• 1142 cm⁻¹ tillid 1,0

  “42 43 cm-1 In the spectrum of PMMA, there is a distinct absorption band at 1142 which is due to O-CH 3 44”

  Ataei 等 - 2020 - Electrosprayed PMMA microcapsules containing green DOI: 10.1088/1361-665X/ab9754
• 1098 cm⁻¹ tillid 1,0

  “The production of biodiesel from oil via a C-O transesterification reaction is monitored by the intensity of the ester cm-1), peak (1098 whereas the mixing of biodiesel and petroleum-based cm-1).”

  Ault 和 Pomeroy - 2012 - Quantitative Investigations of Biodiesel Fuel Usin DOI: 10.1021/ed101097n
• 1233 cm⁻¹ tillid 1,0

  “carbon-hydrogen or C-O band stretching (1233 this is why no characteristic peak was appeared due to cm-1 The broad peak at 3326 is the characteristic band for”

  Awal 等 - 2012 - Thermal analysis and spectroscopic studies of elec DOI: 10.1007/s10973-011-1875-0
• 1380 cm⁻¹ tillid 1,0

  “The vibration at 1380 is assigned to the C O (cid:4)+ (cid:4)+ (cid:4)+ (cid:4)+ (cid:4)- (cid:4) = + + + + (A 1g) (A 2g) (B 1g) (B 2g) (Eg) mode related to the citrate complex.”

  Azam 等 - 2012 - Effect of Mn doping on the structural and optical DOI: 10.1016/j.jallcom.2012.01.072