What absorbs at 3522 cm⁻¹ in an FTIR spectrum?
A band near 3522 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 4 cited sources
Brzi odgovor
A band near 3522 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 |
|---|---|---|---|
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Water (H2O) | 2 | 2 | 1,0 |
| Hydrogen bond | 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 |
|---|---|---|---|
| lignin | 3522, 1035, 1510 | 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 3522 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
-
Water (H2O) pouzdanost 1,0
“3) spectra can be 8 O-H assigned to one of the bonds in the O10 water 9 O10-H101…O1 molecule, while the distance of 2.942 Å 10 cm-1 (Table 5) corresponds to the sharp peak at 3522 11 cm-1 which is present in the Raman spectrum, and 3526”
Ventruti 等 - 2016 - Hydrogen bond system and vibrational spectroscopy DOI: 10.1127/ejm/2016/0028-2571 -
Water (H2O) pouzdanost 1,0
“cm-1 Cl 0.12 1.49 The bands located at 3522 and 3433 correspond to the valence vibrations of the cm-1, O 1.62 water molecule.”
Synthesis of New Homopiperazine-1.4-Diium Tetrachloridromercurate (II) Monohydrate (C5H14N2)[HgCl4]H2O, Crystal Structure, Hirshfeld Surface, Spectroscopy, Thermal Analysis, Antioxidant Activity, Electric and Dielectric Behavior DOI: 10.3390/cryst12040486 -
Hydroxyl (O-H) pouzdanost 1,0
“shows two characteristic bands observed at 3522 and 3361 These bands are respectively attributed to free hydroxyl stretching vibrations (not hydrogen bonded) and to those that are self-associated (hydrogen bonded) with the hydroxyl groups (”
Miscibility and Hydrogen Bonding in Blends of Poly(4-vinylphenol)/Poly(vinyl methyl ketone) DOI: 10.3390/polym6112752 -
Hydrogen bond pouzdanost 1,0
“According to cm-1 and 3550 related to intramolecular hydrogen bond Kubo and Kadla (2005), in lignin the hydroxyl groups cm-1 in phenolic groups, and a small band at around 3522 in alcoholic and phenolic compounds form several lignin2,20.”
Poletto 和 Zattera - 2013 - Materials Produced from Plant Biomass. Part III D DOI: 10.1590/S1516-14392013005000112
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