Aromatic ring — FTIR-absorptions-toppe og tildelinger

Hurtigt svar

Aromatic ring 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 Aromatic ring

Viser de 30 bedst understøttede toppe ud af 1047 i alt for Aromatic ring.

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

• 1600 cm⁻¹ tillid 1,0

  “For the drug QF, FT-IR analysis showed the characteristic 51 cm@1 peaks at 1600, 766 and 745 which are attributed to 52 presence of substituted benzene ring.”

  Arikibe 等 - 2019 - pH-Responsive Studies of Bacterial CelluloseChito DOI: 10.1002/slct.201902290
• 3000 cm⁻¹ tillid 1,0

  “3000cm-1 the region In the present case, the very strong rise to three bands above for aromatic C H and 1164cm-1 modes observed at 1289 and in IR corresponds to H stretching observed in the region between one aliphatic C 2900cm-1.”

  Arjunan 等 - 2007 - Fourier transform infrared and Raman spectral assi DOI: 10.1016/j.saa.2006.09.044
• 1535 cm⁻¹ tillid 1,0

  “LLM confirmed rule peak-group candidate”

  Arizka 等 - 2019 - Synthesis and Physical Properties Characterization DOI: 10.1088/1757-899X/546/4/042004
• 1514 cm⁻¹ tillid 1,0

  “The most intense bands were the carbonyl peak at 1672 cm-1 and the benzene ring stretching at 1514, 1477, and 1392 cm-1.”

  Armenta 等 - 2005 - FTIR approaches for diuron determination in commer DOI: 10.1021/jf050268f
• 1514 cm⁻¹ tillid 1,0

  “Enzymatic delignification of cm-1 cm-1 this optimized mixture was supported by FTIR studies where peak intensity at 1514 and 1595 corresponding to the aromatic skeletal vibrations of lignin decreased in magnitude after delignification.”

  A strategic laccase mediated lignin degradation of lignocellulosic feedstocks for ethanol production DOI: 10.1016/j.indcrop.2016.08.009
• 1628 cm⁻¹ tillid 1,0

  “A strong band at 1628 can also be assigned to the C=C stretch in the aromatic”

  Aziz 等 - 2017 - From Insulating PMMA Polymer to Conjugated Double DOI: 10.3390/polym9110626
• 1240 cm⁻¹ tillid 1,0

  “The disappearance of the lignin peak at 1240 could be due to conjugated ketone (phenyl-carbonyl) removal or the removal of ferulic and p-coumaric”

  Physicochemical characterisation of barley straw treated with sodium hydroxide or urea and its digestibility and in vitro fermentability in ruminants DOI: 10.1038/s41598-022-24738-w
• 3017 cm⁻¹ tillid 1,0

  “For OI3-oligomer, a broad band at 3253 C-O cm-1 ─NH is primary stretch of amines, a small band near 3017 cm-1 ─C─H appeared due to aromatic stretch.”

  Influence of amine‐terminated additives on thermal and mechanical properties of diglycidyl ether of bisphenol A (DGEBA) cured epoxy DOI: 10.1002/app.48404