Hvad absorberer ved 1738 cm⁻¹ i et FTIR-spektrum?

Hurtigt svar

Et bånd nær 1738 cm⁻¹ fortolkes normalt ved at kontrollere, hvilke funktionelle grupper der gentagne gange forekommer der i litteraturen, og derefter bekræfte mindst en eller to yderligere peaks i den samme prøve. Denne side rangerer disse tildelinger efter akkumuleret evidens snarere end efter en enkelt fast lærebogsregel.

Mulige funktionelle gruppetildelinger

Rangering afspejler akkumuleret litteraturevidence, ikke en enkelt fast regel. Bekræft altid mod din prøvekontekst.

Mulige materialer

Materialer vises kun, når den samme litteraturpulje understøtter dette bånd og mindst en yderligere karakteristisk top.

Spektrumlogik

Dette bånd bliver meningsfuldt kun, når det læses sammen med sine nabotoppe. I praksis ser analytikere først på tildelingerne ovenfor, og kontrollerer derefter, om den samme prøve også viser andre toppe, der forventes for det samme strukturelle motiv. Et enkelt bånd nær 1738 cm⁻¹ er normalt ikke nok til materialeidentifikation alene.

Anvendelse i virkeligheden

Denne type forespørgsel er almindelig ved polymeridentifikation, screening af ukendt plast, fejlfinding i kvalitetskontrol, verifikation af genanvendt materiale og litteraturunderstøttet gennemgang af peak-tildeling.

Almindelige fejl

• Behandling af et isoleret bånd som bevis på et materiale uden at kontrollere mindst en eller to understøttende toppe.
• Ignorerer overlap: flere funktionelle grupper kan bidrage nær samme bølgetal.
• Spring validering over, når additiver, blandinger, oxidation eller forurening kan forvrænge spektret.

Verifikationsrådgivning

Når tvetydighed fortsat består, valider hypotesen med DSC, GC-MS eller TGA, især for blandinger, nedbrudte prøver og fyldte polymerer.

Litteratur bag disse tildelinger

• Carbonyl (C=O) tillid 1,0

  “Appearance of new peak at 1738 corresponding to carbonyl ester stretch indicates possible esterification reaction of carboxylic anion with highly strained epoxy ring leading to ionized epoxide (shown in Fig.”

  Mechanism and Kinetics of Curing of Diglycidyl Ether of Bisphenol A (DGEBA) Resin by Chitosan DOI: 10.1002/pen.24463
• Carboxyl (COOH) tillid 1,0

  “split in three peaks seen at 1738, 1706 and This split indicates that the COOH group is influenced by the absence of the iron center as well as by the symmetry of the porphyrin ring.”

  Doerr 等 - 2008 - Far infrared spectroscopy on hemoproteins A model DOI: 10.1016/j.vibspec.2008.02.003
• Carbonyl (C=O) tillid 1,0

  “From the FTIR spectra, we can see that the stretching vibration of the carbonyl group (C=O) for aliphatic esters is in wave number 1732, 1738, 1737 and 1740 cm-1 for SFA-TMP ester, SFA-Di-TMP ester, SFA-PE ester and SFA-Di-PE ester respecti”

  Jumaah 等 - 2021 - Optimization for esterification of saturated palm DOI: 10.3906/kim-2103-11
• Hydroxyl (O-H) tillid 1,0

  “Full FT-IR experimental study of GU S was reported in Figure 3 in which C=O, C=N, C-O, C-N, N-H and O-H bonds is completely U N clear peaks respectively in 1738, 1607, 1228, 1082, 3816 (broad peak), 2820-3370 (sharp peak) A”

  Karimzadeh 等 - 2018 - FT-IR study and solvent-implicit and explicit effe DOI: 10.1016/j.saa.2018.03.009
• Acetate tillid 1,0

  “peak peak at 1738 for C O stretching gives evidence of carboxylic at 1738 The decrease in the intensity for the peaks at cm-1 cm-1 acid 1505 and ester group present in the hemicellulose, which entirely and 1456 after alkali treatment is a s”

  Kasyapi 等 - 2013 - Bionanowhiskers from jute Preparation and charact DOI: 10.1016/j.carbpol.2012.10.021
• C-S single bond tillid 1,0

  “5B), and shift C-S - (stretch) 1738 1753 1744 [51] (Fig.”

  Probing the interaction of glutathione with different shape of silver-nanoparticles by optical spectroscopy DOI: 10.1016/j.mtcomm.2021.102137
• Carbonyl (C=O) tillid 1,0

  “Camphor and DBP have cm-1 a characteristic carbonyl peak at 1738 and 1720 responding with the main spectral bands for PVAc (1736 cm-1) cm-1) and 1234”

  Identification of cellulose nitrate based adhesive repairs in archaeological pottery of the University of Melbourne’s Middle Eastern archaeological pottery collection using portable FTIR-ATR spectroscopy and PCA DOI: 10.1186/s40494-016-0116-z
• Acetate tillid 1,0

  “However, a distinct containing WPI showed C-O-C glycosidic absorption peak 44o cm-1 Ɵ peak was visible at = in all the hydrogels loaded with at 1167 and C=O stretch for rGO at 1738 cm, conthe drugs (Fig.”

  Owonubi 等 - 2018 - Characterization and in vitro release kinetics of DOI: 10.1007/s40090-018-0139-2