What absorbs at 439 cm⁻¹ in an FTIR spectrum?
A band near 439 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 439 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 |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 4 | 4 | 1,0 |
| Metal oxygen | 2 | 2 | 1,0 |
| Silicon (Si) | 2 | 2 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 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 |
|---|---|---|---|
| kaolinite | 439, 3696, 693 | Silicon-oxygen (Si-O), Silicon (Si), Siloxane (Si-O-Si) | 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 439 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
-
C c single bond zaupanje 1,0
“absorption peak is observed near 439 This feature cm(cid:3)1 (A0) n C¼C-C is attributed to in-plane bending mode of 3.3.1.”
Temperature-dependent absorption cross-section measurements of 1-butene (1-C4H8) in VUV and IR DOI: 10.1016/j.jqsrt.2012.09.014 -
zaupanje 1,0
“a peak at 439 arises from Si-O-Si bending vibration.”
Souissi 等 - 2022 - Synthesis, Thermal Properties and Electrical Condu DOI: 10.21203/rs.3.rs-1294285/v1 -
Silicon (Si) zaupanje 1,0
“The absorption band detected at 439 wavenumber cm-1 can be ascribed to Si-O bending.”
Hydroprocessing of Oleic Acid for Production of Jet-Fuel Range Hydrocarbons over Cu and FeCu Catalysts DOI: 10.3390/catal9121051 -
Metal oxygen zaupanje 1,0
“Process., 56(5), 2020, 860-873 865 cm-1 and 439.45 cm-1 were contributed by asymmetric stretching vibration peaks and out-of-plane bending vibration absorption peaks of -W-O bonds of WO 42-.”
Lu 等 - 2020 - Effect of manganese ions addition orders on the fl DOI: 10.37190/ppmp/126421 -
zaupanje 1,0
“The 439 peak in the geopolymer relative to Si-O bond while in powders this cm-1.”
Pereira 等 - 2019 - Synthetic Aluminosilicates for Geopolymer Producti DOI: 10.1590/1980-5373-MR-2018-0508 -
Metal oxygen zaupanje 0,9
“Nb-O bond characteristic”
Wang 和 Jiang - 2011 - Synthesis and Characterization of LiNbO3 Powders b DOI: 10.1080/00150193.2011.554260 -
Silicon-oxygen (Si-O) zaupanje 0,9
“Stretching vibrations of Si-O-T or Al.”
EL Alouani 等 - 2020 - Influence of the Nature and Rate of Alkaline Activ DOI: 10.1155/2020/8880906
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