What absorbs at 909 cm⁻¹ in an FTIR spectrum?
A band near 909 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 5 cited sources
Brzi odgovor
A band near 909 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
| Funkcionalna skupina | Potporni dokazi | Citirani izvori | Najveća pouzdanost |
|---|---|---|---|
| Silicon (Si) | 2 | 2 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Metal hydroxyl | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
Rangiranje odražava akumulirane literaturne dokaze, a ne jedno autoritativno pravilo. Uvijek provjerite u kontekstu vašeg uzorka.
Mogući materijali
| Materijal | Potporni vrhovi | Preklapajuće skupine | Citirani izvori |
|---|---|---|---|
| chitosan | 909, 1650, 1655 | Hydroxyl (O-H) | 1 |
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 909 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
-
Alkyl C-H pouzdanost 1,0
“Moreover, peaks at 909 and C-H out-of-plane C-H ascribed to bending modes and The conducted research is not related Ethical approval:”
Ahmad 等 - 2020 - Synthesis and characterization of a novel chitosan DOI: 10.1515/chem-2020-0137 -
Alkene (C=C) pouzdanost 1,0
“As expected, crosslinking was induced in the polymer: radicals formed by radiations move rapidly along polyethylene chains in the amorphous phase and react easily with terminal double bonds cm-1 (absorption at 909 decreases), creating the s”
Barus 等 - 2009 - Preparation of polymeric hybrid nanocomposites bas DOI: 10.1016/j.polymer.2009.04.012 -
Siloxane (Si-O-Si) pouzdanost 1,0
“H-OH bending of adsorbed water 1104 Si-O stretching 1104 Si-O stretching 1036 Si-O-Si stretching 1036 Si-O-Si stretching 909”
SO42-/Sn-MMT Solid Acid Catalyst for Xylose and Xylan Conversion into Furfural in the Biphasic System DOI: 10.3390/catal7040118 -
pouzdanost 1,0
“cm-1, cm-1 cm-1 The telescopic vibration adsorption peaks at 909 837 and 779 correspond to Al-O-H, Si-O and Mg-O-H in the SB chemical structure, respectively, and they were clearly abated, as evident in the spectra cm-1 of TLSB.”
Enhanced heavy metal removal from an aqueous environment using an eco-friendly and sustainable adsorbent DOI: 10.1038/s41598-020-73570-7 -
pouzdanost 0,9
“Explicit assignment: IR band at 909 cm-1 characteristic of 31 helical conformation of stereocomplex PLA.”
Crystallization and Stereocomplexation of PLA-mb-PBS Multi-Block Copolymers DOI: 10.3390/polym10010008
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