What absorbs at 557 cm⁻¹ in an FTIR spectrum?

Schnelle Antwort

A band near 557 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.

Mögliche Funktionsgruppenzuweisungen

Das Ranking spiegelt die gesammelte Literatur Evidenz wider, nicht eine einzelne maßgebliche Regel. Bestätigen Sie immer anhand Ihres Probenkontexts.

Mögliche Materialien

Materialien werden nur angezeigt, wenn derselbe Literaturpool diese Bande und mindestens einen weiteren charakteristischen Peak unterstützt.

Spektrumslogik

This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 557 cm⁻¹ is usually not enough for material identification by itself.

Praktische Anwendung

Diese Art von Abfrage ist üblich bei der Polymeridentifikation, dem Screening unbekannter Kunststoffe, der Fehlersuche in der Qualitätskontrolle, der Verifizierung von Recyclingmaterial und der literaturgestützten Überprüfung der Peakzuordnung.

Häufige Fehler

• Behandlung einer isolierten Bande als Beweis für ein Material, ohne mindestens einen oder zwei unterstützende Peaks zu überprüfen.
• Überlappung ignorieren: Mehrere funktionelle Gruppen können nahe der gleichen Wellenzahl beitragen.
• Überspringen der Validierung, wenn Additive, Mischungen, Oxidation oder Verunreinigungen das Spektrum verfälschen können.

Beratung zur Verifizierung

Wenn weiterhin Mehrdeutigkeit besteht, validieren Sie die Hypothese mit DSC, GC-MS oder TGA, insbesondere bei Mischungen, degradierten Proben und gefüllten Polymeren.

Literatur hinter diesen Zuweisungen

• Metal oxygen Vertrauen 1,0

  “LLM confirmed rule peak-group candidate”

  Mesoporous magnetite nanoparticles synthesis using the Peltophorum pterocarpum pod extract, their antibacterial efficacy against pathogens and ability to remove a pollutant dye DOI: 10.1016/j.molstruc.2018.10.042
• Carbohydrate Vertrauen 1,0

  “663 662 Out of plane bending vibration of intermolecular H-bonded O H group 666 558 557 Torsional vibration of pyranose ring 557 cm-1 cm-1”

  Kasyapi 等 - 2013 - Bionanowhiskers from jute Preparation and charact DOI: 10.1016/j.carbpol.2012.10.021
• Hydroxyl (O-H) Vertrauen 1,0

  “Salama et al./Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 136 (2015) 1816-1826 805 905 473 goethite OH bending bands 557 Type 3”

  Spectroscopic characterization of iron ores formed in different geological environments using FTIR, XPS, Mössbauer spectroscopy and thermoanalyses DOI: 10.1016/j.saa.2014.10.090
• Vertrauen 1,0

  “reveals the characteristic vibrational bands at 557, 688, 717, 881, 935 and 1039 The cm-1 vibrational modes at 557 and 717 are assigned to the structural vibrations of yttrium-oxygen cm-1 (Y-O) bonds, the peak at 688 to the stretching mode”

  Luminescence and electron spin resonance studies of narrow-band UVB emitting Gd3+ doped Y2SiO5 nanophosphors synthesized by sol-gel method DOI: 10.1016/j.ijleo.2021.167228
• Metal oxygen Vertrauen 1,0

  “The metal-oxygen band at 557 corresponded to intrinsic cm-1 stretching vibrations of metal at the tetrahedral site, while the metal-oxygen band found at 425 was assigned to octahedral-metal stretching of Fe-O [53-55].”

  Yadav 等 - 2020 - Synthesis and Characterization of Amorphous Iron O DOI: 10.3390/nano10081551
• Silanol (Si-OH) Vertrauen 1,0

  “attributed to the Si-O stretching vibration [18, 19], a peak causeMgislesselectronegativethanH,andconsequently, at799cm-1 resultsfromthe symmetricSi-Ostretchingvithe substitution of H (2.1) in Si-OH by Mg (1.2) would decm-1 bration, and pea”

  Zhang 等 - 2019 - Influence of Magnesia on Demoulding Strength of Co DOI: 10.1515/rams-2019-0008
• Vertrauen 1,0

  “990cm-1 powder of white MTA Angelus root repair shows the presPlus, bands at have been assigned to asymmetric 43ence oftricalcium silicate (aliteofhatrurite,Ca stretching vibration of phosphate (PO ) [4], but those at 3(SiO 4)O;card 557cm-1”

  Abu Zeid 等 - 2017 - Chemistry and Bioactivity of NeoMTA Plus (TM) vers DOI: 10.1155/2017/8736428
• Amide Vertrauen 1,0

  “Moreover, in the spectra of the control unheated films, the intensity cm-1 557 of the band of amide I at 1630 was always lower than that of the band of the amide II at cm-1, 558 1550 regardless of the Mw of chitosan/CDP, as a consequence of”

  Effect of glucose-induced Maillard reaction on physical, structural and antioxidant properties of chitosan derivatives-based films DOI: 10.1016/j.carbpol.2020.117341