C c single bond — FTIR-absorptions-toppe og tildelinger

Hurtigt svar

C c single bond 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 C c single bond

Viser de 30 bedst understøttede toppe ud af 809 i alt for C c single bond.

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

• 1610 cm⁻¹ tillid 1,0

  “LLM confirmed rule peak-group candidate”

  Quantum chemical studies and vibrational analysis of 4-acetyl benzonitrile, 4-formyl benzonitrile and 4-hydroxy benzonitrile – A comparative study DOI: 10.1016/j.saa.2012.08.053
• 1468 cm⁻¹ tillid 1,0

  “In the DCNP, the bands observed in IR at 1468, 1340, 1304, and in IR and 1348, 1569cm(cid:2)1 cm(cid:2)1 1635 and 1309 and 1183 has been assigned to C-C stretching and in in Raman for DCNP and the band observed 1266cm(cid:2)1”

  Vibrational spectra, UV–vis spectral analysis and HOMO–LUMO studies of 2,4-dichloro-5-nitropyrimidine and 4-methyl-2-(methylthio)pyrimidine DOI: 10.1016/j.saa.2013.01.029
• 1060 cm⁻¹ tillid 1,0

  “The peaks appearing near 720 corresponds to the C-Cl cm-1 stretching mode and at 1060 assigned to (C-C) stretching mode of PVC.”

  Arya 和 Sharma - 2018 - Structural, microstructural and electrochemical pr DOI: 10.1007/s11581-017-2364-7
• 1098 cm⁻¹ tillid 1,0

  “However, the peak at 1098 cm-1 C-C-O stretch69) be used, if available.”

  Quantitative Investigations of Biodiesel Fuel Using Infrared Spectroscopy: An Instrumental Analysis Experiment for Undergraduate Chemistry Students DOI: 10.1021/ed101097n
• 890 cm⁻¹ tillid 1,0

  “2 cm-1: jugated ketone (phenyl-carbonyl) in lignin, 1160 C-O-C asymmetrical stretching in cellulose and hemicm-1: cm-1: celluloses, 1030 C-O, C=C, and C-C-O stretching in wood, and 890 glycosidic linkage.”

  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
• 1412 cm⁻¹ tillid 1,0

  “The 1635.78cm-1 C]O peak of shows carbonyl group and 3.5 1411.89cm-1 C-C shows stretching.”

  Green synthesis of silver nanoparticles using Tropaeolum majus : Phytochemical screening and antibacterial studies DOI: 10.1515/gps-2021-0003
• 1412 cm⁻¹ tillid 1,0

  “The peak This is a chromophoric assay in which change in cm-1 of 1658.78 shows carbonyl group and peak absorbance is indicated by change in color and cm-1 at 1411.89 shows C-C stretching.”

  Synthesis, Characterization and Bioactivity Profiling of Gold Nanoparticles of Trachyspermum ammi Crude Extract DOI: 10.22207/JPAM.15.2.11
• 3105 cm⁻¹ tillid 1,0

  “al.29 band at 3105 reported by Pace et who assigned it as the combination band of the C-C 47 48 cm-1) cm-1).”

  Blue-Shifted Hydrogen Bonding in the Gas Phase CH/D3CN···HCCl3 Complexes DOI: 10.1021/acs.jpca.8b12200