What absorbs at 426 cm⁻¹ in an FTIR spectrum?

Brzi odgovor

A band near 426 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.

Moguće dodjele funkcionalnih skupina

Rangiranje odražava akumulirane literaturne dokaze, a ne jedno autoritativno pravilo. Uvijek provjerite u kontekstu vašeg uzorka.

Mogući materijali

Materijali su prikazani samo kada ista literatura podržava ovu traku i barem jedan dodatni karakteristični vrh.

Logika spektra

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 426 cm⁻¹ is usually not enough for material identification by itself.

Upotreba u stvarnom svijetu

Ova vrsta upita uobičajena je u identifikaciji polimera, probiru nepoznate plastike, rješavanju problema u kontroli kvalitete, provjeri recikliranog materijala i pregledu dodjele vrhova potkrijepljenom literaturom.

Uobičajene pogreške

• Tretiranje jedne izolirane vrpce kao dokaza materijala bez provjere barem jednog ili dva podržavajuća pika.
• Zanemarivanje preklapanja: više funkcionalnih skupina može doprinositi u blizini istog valnog broja.
• Preskakanje validacije kada aditivi, mješavine, oksidacija ili kontaminacija mogu izobličiti spektar.

Savjet za provjeru

Kada nejasnoća ostane, validirajte hipotezu pomoću DSC, GC-MS ili TGA, posebno za mješavine, degradirane uzorke i punjene polimere.

Literatura iza ovih dodjela

• pouzdanost 1,0

  “The peaks at 426 and 743 appeared only for FHO, which was assigned to the Fe-O-Fe stretching vibration [24] and would be the Fe-OH band, respectively [25].”

  Kim 等 - 2019 - The Application of Alginate Coated Iron Hydroxide DOI: 10.3390/app9183835
• Water (H2O) pouzdanost 1,0

  “First peak reflects slightly 426 bound water loss and second peak evinces degradation of polymeric structure (Giancone et al., 2011).”

  Evaluation of structural integrity and functionality of commercial pectin based edible films incorporated with corn flour, beetroot, orange peel, muesli and rice flour DOI: 10.1016/j.foodhyd.2019.01.022
• pouzdanost 1,0

  “Further addition of new peaks at 613 and 426 cm-1 strongly revealed the growth of inorganic particles (due to (a.u.) Fe-O vibrations) on the NSS surface.”

  Facile Synthesis of Magnetic Nigella Sativa Seeds: Advances on Nano-Formulation Approaches for Delivering Antioxidants and Their Antifungal Activity against Candida albicans DOI: 10.3390/pharmaceutics15020642
• Metal oxygen pouzdanost 1,0

  “spectra of the deposited ZnO Characteristic cm-1 Zn-O peaks at 426 are related to stretching vibration and vibration-phonon mode E (transversal optic) also, a 1 cm-1 Zn-O is attributed to the stretching second peak at 490 reports.19-21 vibr”

  Salinas Dominguez 等 - 2020 - Antibody Immobilization in Zinc Oxide Thin Films a DOI: 10.1021/acsomega.0c02583
• pouzdanost 1,0

  “4 cm-1 νCu(II)-O 426.0 is assigned to the stretching vibrations of copper oxide CuO [25].”

  Silva 等 - 2021 - Potential Production of Theranostic Boron Nitride DOI: 10.3390/nano11112907
• pouzdanost 0,9

  “Peak assigned to Si-O-Si rocking.”

  Mahisagar 等 - 2012 - Deposition of porous low-k thin films using Tween DOI: 10.1117/12.927332