What absorbs at 442 cm⁻¹ in an FTIR spectrum?
A band near 442 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 7 cited sources
Hiter odgovor
A band near 442 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 | 3 | 2 | 1,0 |
| Phospholipid | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| C=n | 1 | 0 | 1,0 |
| Aromatic ring | 1 | 0 | 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 |
|---|---|---|---|
| MWCNT | 442, 2876, 1430 | Methacrylate | 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 442 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
-
zaupanje 1,0
“It shows two strong characteristic absorption 723.67eV correspond to Fe 2p1/2, these peaks can be attributed to bands at 592 cm-1 and 442 cm-1.”
Structural and magnetic properties of Gd-Zn substituted M-type Ba-Sr hexaferrites by sol-gel auto-combustion method DOI: 10.1016/j.jallcom.2019.06.348 -
zaupanje 1,0
“doi: 10.1063/1.4810583 © 2013 AIP Publishing LLC 978-0-7354-1160-9/$30.00 1027 cm-1 Second broad weak absorption peak near 442 may be attributed to bending of Fe-O and Bi-O groups.”
Singh 等 - 2013 - Synthesis and Optical Properties of Y(3+)Doped BiF DOI: 10.1063/1.4810583 -
Metal oxygen zaupanje 1,0
“In addition, the spectra of the PLA/hyb nanocomposites show two cm-1 442 that represent the stretching vibrations of Al-O and new weak peaks at 516 and 462 443 bending vibrations of Si-O from the nanohybrid (Zhang et al., 2003;”
Influence of montmorillonite/carbon nanotube hybrid nanofillers on the properties of poly(lactic acid) DOI: 10.1016/j.clay.2020.105925 -
zaupanje 1,0
“For molecules, the peak at the 3,442cm-1 composites wavenumber belongs to the amino groups.”
Song 等 - 2020 - Improved high-temperature damping performance of n DOI: 10.1515/epoly-2020-0054 -
Acetate zaupanje 1,0
“2 441 stretching vibration respectively, which is suggestive of acyl chain flexibility, whilst the peak at cm-1 442 1732 represents C=O stretching within the ester group on the phospholipids' tail.”
Weaver 等 - 2022 - Microfluidic-mediated self-assembly of phospholipi DOI: 10.1016/j.ijpharm.2021.121347 -
zaupanje 0,9
“Explicit assignment in text”
Guo 等 - 2010 - Micro-Raman and FTIR Spectroscopic Observation on DOI: 10.1021/jp9104147 -
zaupanje 0,8
“Range 425-442 cm-1 corresponds to octahedral clusters”
Singhal 等 - 2012 - Magnetic Properties of BaAlFe11O19 Hexaferrite wit DOI: 10.1080/10426914.2011.551961
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