Ring structure — FTIR-absorptions-toppe og tildelinger

Hurtigt svar

Ring structure 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 Ring structure

Viser de 30 bedst understøttede toppe ud af 812 i alt for Ring structure.

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
• 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
• 810 cm⁻¹ tillid 1,0

  “It is worth mentioning that the peak at 810 (figure 8(c)) which corresponds to 27 28 the epoxy ring in AESO structure has gradually become weaker and almost disappeared after 30”

  Ataei 等 - 2020 - Electrosprayed PMMA microcapsules containing green DOI: 10.1088/1361-665X/ab9754
• 1161 cm⁻¹ tillid 1,0

  “cm-1, due to Meanwhile, the presence of electron-withdrawing bromines in Meanwhile, the intense peaks at 1161 and 1042 υ(CCC) compound (2), reduced the electron density in the phenylene ring stretching vibration of long linear dioctyloxy ch”

  Synthesis of a novel 1,4‐bis[2‐(5‐thiophen‐2‐yl)‐1‐benzothiophene]‐2,5‐dioctyloxybenzene pentamer for creatinine detection. DOI: 10.1002/ajoc.202100374
• 1628 cm⁻¹ tillid 1,0

  “A strong band at 1628 cm-1 can also be assigned to the C=C stretch in the ring and the C=O stretch in polyphenols [18,19].”

  Aziz 等 - 2017 - From Insulating PMMA Polymer to Conjugated Double DOI: 10.3390/polym9110626
• 3192 cm⁻¹ tillid 1,0

  “The bands at 3089 and cm-1 δ, tributors, although from tan it is the high level DMSO and 3192 correspond to the N-H stretch of the Ba ring.”

  Conductivity or rheology? Tradeoff for competing properties in the fabrication of a gel polymer electrolyte based on chitosan-barbiturate derivative DOI: 10.1007/s11581-018-2515-5
• 913 cm⁻¹ tillid 1,0

  “The FTIR of cured epoxy shows ring opening by the disappearance of oxirane ring peak at 913 whereas X-ray diffraction shows its amorphous phase in the cured state.”

  Influence of amine‐terminated additives on thermal and mechanical properties of diglycidyl ether of bisphenol A (DGEBA) cured epoxy DOI: 10.1002/app.48404
• 1176 cm⁻¹ tillid 1,0

  “spectra of the PDPA in doped state, these being peaked at 1176, 1201, 1368, 1541 and 1603 These Raman lines were attributed to vibrational modes of C-H bending in benzene ring, C-N stretching, semi-quinoid”

  Baibarac 等 - 2019 - Adsorption of 1,4-phenylene diisothiocyanate onto DOI: 10.1038/s41598-019-48314-x