Aldehyde (CHO) — FTIR-absorptions-toppe og tildelinger

Hurtigt svar

Aldehyde (CHO) 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 Aldehyde (CHO)

Viser de 30 bedst understøttede toppe ud af 121 i alt for Aldehyde (CHO).

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

• 1745 cm⁻¹ tillid 1,0

  “cm(cid:3)1 1747cm(cid:3)1 1745cm(cid:3)1 peak at 1745 on both spectra exhibited similar intensity for which showed stronger than that at of C4 cm(cid:3)1 the content of aldehydes, ketones and carbonyl stretching vibrain intensity.”

  Chen 等 - 2014 - Determination of chemical changes in Isatis indigo DOI: 10.1016/j.saa.2014.01.048
• 1730 cm⁻¹ tillid 1,0

  “appearance of carboxylic acid and aldehyde peaks at 1730 and 3.1.”

  Chu 和 Yaylayan - 2009 - FTIR monitoring of oxazolidin-5-one formation and DOI: 10.1016/j.carres.2008.10.011
• 1020 cm⁻¹ tillid 1,0

  “On the other hand, peak 3 cm-1 at 1020 of the TCHO region represents non-structural CHO such as starch [15].”

  Gene-Transformation-Induced Changes in Chemical Functional Group Features and Molecular Structure Conformation in Alfalfa Plants Co-Expressing Lc-bHLH and C1-MYB Transcriptive Flavanoid Regulatory Genes: Effects of Single-Gene and Two-Gene Insertion DOI: 10.3390/ijms18030664
• 900 cm⁻¹ tillid 1,0

  “EXE 9 and CRE + EXE 9), = = = cating bands assigned to the NH stretching vibrations feeding and supplementation protocols, tissue prepacm21) (~3000-3500 and (b) indicating bands assigned ration, and FT-IR spectrometry evaluation were also t”

  Jeronimo 等 - 2012 - Detection of Creatine in Rat Muscle by FTIR Spectr DOI: 10.1007/s10439-012-0549-9
• 1453 cm⁻¹ tillid 1,0

  “The 2928cm-1 peaks positioned at about 1453 and of wavelength were due to the stretching C-H of alkane methyl and aldehyde doublet groups.”

  Jing 等 - 2019 - Biosynthesis of copper oxide nanoparticles and the DOI: 10.1016/j.jphotobiol.2019.111557
• 1735 cm⁻¹ tillid 1,0

  “Attention should be paid to a cm-1) very important area, which is only slightly marked in our spectra (with a maximum at about 1735 and is due to the stretching vibrations of functional groups such as ketone C = O of fructose and aldehyde C”

  Identification of sugars and phenolic compounds in honey powders with the use of GC–MS, FTIR spectroscopy, and X-ray diffraction DOI: 10.1038/s41598-020-73306-7
• 1750 cm⁻¹ tillid 1,0

  “The bands at 1800-1600 with a cm-1, prominent peak at 1750 were assigned to C=O stretching vibrations of aldehydes and D ketones [29].”

  Nkwain 等 - 2018 - Coupling pyrolysis with mid-infrared spectroscopy DOI: 10.1016/j.jaap.2018.04.004
• 1727 cm⁻¹ tillid 1,0

  “In addition, Cya produced a peak at 1727 due to stretching vibration of the cm-1, aldehyde group.”

  Improvement of stability due to a cyclamen aldehyde/β-cyclodextrin inclusion complex DOI: 10.1016/j.molstruc.2020.128161