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

Ātra atbilde

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.

Iespējamie funkcionālo grupu piešķīrumi

Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.

Iespējamie materiāli

Materiāli tiek parādīti tikai tad, ja šo joslu un vismaz vienu papildu raksturīgo pīķi atbalsta tā pati literatūras kopa.

Spektra loģika

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.

Reālās pasaules izmantošana

Šāda veida vaicājums ir izplatīts polimēru identificēšanā, nezināmas plastmasas skrīningā, kvalitātes kontroles problēmu risināšanā, pārstrādāto materiālu pārbaudē un ar literatūru pamatotā pīķu piešķīruma pārskatā.

Biežākās kļūdas

• Vienas izolētas joslas uzskatīšana par materiāla pierādījumu, nepārbaudot vismaz vienu vai divus atbalsta pīķus.
• Ignorējot pārklāšanos: vairākas funkcionālās grupas var dot ieguldījumu tuvu tam pašam viļņa skaitlim.
• Izlaist validāciju, ja piedevas, maisījumi, oksidācija vai piesārņojums var izkropļot spektru.

Verifikācijas padoms

Ja joprojām pastāv neskaidrība, apstipriniet hipotēzi ar DSC, GC-MS vai TGA, īpaši maisījumiem, noārdītiem paraugiem un pildītiem polimēriem.

Literatūra aiz šiem piešķīrumiem

• pārliecība 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) pārliecība 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
• pārliecība 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 pārliecība 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
• pārliecība 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
• pārliecība 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