What absorbs at 425 cm⁻¹ in an FTIR spectrum?
A band near 425 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 8 cited sources
Hiter odgovor
A band near 425 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.
Možne dodelitve funkcionalnih skupin
| Funkcionalna skupina | Podporna dejstva | Citirani viri | Najvišje zaupanje |
|---|---|---|---|
| Metal oxygen | 6 | 6 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
Razvrstitev odraža zbrane literaturne dokaze, ne enega avtoritativnega pravila. Vedno preverite glede na kontekst vašega vzorca.
Možni materiali
| Material | Podporni vrhovi | Prekrivajoče se skupine | Citirani viri |
|---|---|---|---|
| magnetite | 425, 1740, 1263 | Metal oxygen, Silicon-oxygen (Si-O), Methoxy (OCH3) | 1 |
| iron oxide | 425, 1130, 891 | Methoxy (OCH3), Metal oxygen | 1 |
Materiali so prikazani le, ko ista literaturna podlaga podpira ta pas in vsaj en 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 425 cm⁻¹ is usually not enough for material identification by itself.
Uporaba v resničnem svetu
Ta vrsta poizvedbe je pogosta pri identifikaciji polimerov, pregledovanju neznanih plastičnih mas, odpravljanju težav pri QC, preverjanju recikliranih materialov in literaturno podprtem pregledu dodelitev vrhov.
Pogoste napake
- Obravnavanje enega izoliranega pasu kot dokaza o materialu brez preverjanja vsaj enega ali dveh podpornih vrhov.
- Ignoriranje prekrivanja: več funkcionalnih skupin lahko prispeva blizu istega valovnega števila.
- Izpuščanje validacije, ko lahko dodatki, mešanice, oksidacija ali kontaminacija popačijo spekter.
Nasvet za preverjanje
Ko ostaja dvoumnost, potrdite hipotezo z DSC, GC-MS ali TGA, zlasti za mešanice, degradirane vzorce in polnjene polimere.
Literatura za temi dodelitvami
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Acetate zaupanje 1,0
“5 we have reinvestigate the infrared spectrum of the gaseous assigned to Mn C O bending vibrations and band observed at 425cm-1 sample of these compounds which are known to be pure, so that 416, 418, belong to Mn C axial stretching vibratio”
Mahmood 等 - 2006 - Comparative vapour phase FTIR spectra and vibratio DOI: 10.1016/j.saa.2005.11.024 -
zaupanje 1,0
“A sharp band C was observed at 425 which confirmed the zinc-oxygen stretching mode [30].”
Pai 等 - 2019 - Photocatalytic zinc oxide nanoparticles synthesis DOI: 10.1016/j.ijleo.2019.03.101 -
zaupanje 1,0
“The band cm-1 cm-1 at 425 and 557 indicates the Fe-O bonds of magnetite nanoparticles which are similar to cm-1”
Yadav 等 - 2020 - Synthesis and Characterization of Amorphous Iron O DOI: 10.3390/nano10081551 -
Metal oxygen zaupanje 1,0
“Moreover, the Ti-O stretching vibration is Transmittance seen at a wave number of around 425 cm-1 [30].”
Fluoride Evaporation of Low-Fluoride CaF2-CaO-Al2O3-MgO-TiO2-(Na2O-K2O) Slag for Electroslag Remelting DOI: 10.3390/ma16072777 -
Amide zaupanje 1,0
“(cm-1) Wavenumber Band assignment β - 1688 (shoulder) Amide I sheets protein A α - A27 1654 (shoulder) Amide I helix protein β - IgG425,37 1634 (main peak) Amide I sheets - IgG427 1545 (main peak) Amide II unordered”
Beattie 等 - 2021 - Insight into purification of monoclonal antibodies DOI: 10.1039/d1an00985k -
Metal oxygen zaupanje 1,0
“Stretching vibration of La-O 430 Stretching vibration of Ce-O 440 Stretching vibration of Sm-O 458 b Stretching vibration of Er-O 425 Stretching vibration of Yb-O 430 c”
Investigation of Structural, Physical, and Attenuation Parameters of Glass: TeO2-Bi2O3-B2O3-TiO2-RE2O3 (RE: La, Ce, Sm, Er, and Yb), and Applications Thereof DOI: 10.3390/ma15155393 -
zaupanje 1,0
“At the low wavenumbers, the bands at 425 and 564 can be ascribed to the presence of Mg-O and Al-O bonds related to the LDH structure [25,26].”
Karami 等 - 2020 - Kinetics of Cross-Linking Reaction of Epoxy Resin DOI: 10.3390/polym12051157 -
zaupanje 1,0
“This observation was attributed to 425 the stretching vibrations of Si-O [53, 54] due to the formation of C-(A)-S-H gel.”
Ruan 等 - 2020 - Improvement of the performance and microstructural DOI: 10.1016/j.conbuildmat.2020.120017)
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