What absorbs at 3697 cm⁻¹ in an FTIR spectrum?
A band near 3697 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 3697 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 |
|---|---|---|---|
| Hydroxyl (O-H) | 7 | 7 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 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 |
|---|---|---|---|
| silica | 3697, 1100, 1080 | Silicon-oxygen (Si-O), Silicon (Si), Hydroxyl (O-H) | 1 |
| montmorillonite | 3697, 1637, 523 | Hydroxyl (O-H), Silicon-oxygen (Si-O), Silicon (Si) | 1 |
| kaolinite | 3697, 3696, 693 | Hydroxyl (O-H), Silicon-oxygen (Si-O), Silicon (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 3697 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
-
Hydroxyl (O-H) zaupanje 1,0
“Pt/silicad 3697/3676 O-H stretch of isolated silanol 3673 3740 silicaf 3515 3535/3509 O-H stretch of silanol H-bonded to 3510”
Leewis 等 - 2006 - Ammonia adsorption and decomposition on silica sup DOI: 10.1016/j.apsusc.2005.12.115 -
Hydroxyl (O-H) zaupanje 1,0
“mixed-layered phases in the XRD patterns of the untreated samples reflection O-H-stretching was manifested by a strong and broad between 13Å and The soil clay FTIR spectra contain bands at 3697cm-1 cm-1 and 3653 assigned to kaolinite in add”
The nature of interlayering in clays from a podzol (Spodosol) from the Tatra Mountains, Poland DOI: 10.1016/j.geoderma.2010.10.013 -
Hydroxyl (O-H) zaupanje 1,0
“The extracted strongest absorption band at ~3697cm-1 were assigned to OH-stretching in the octahedral at solution was then separated from the clay fraction residue by sheet of aluminous minerals such as illite or kaolinite (Farmer centrifug”
Characterisation of the hydroxy-interlayered vermiculite from the weathering of illite in Jiujiang red earth sediments DOI: 10.1071/SR14014 -
Hydroxyl (O-H) zaupanje 1,0
“(cm-1) Assignments Wavenumber 3697 O-H stretching”
Caccamo 等 - 2020 - Self-Assembly Processes in Hydrated Montmorillonit DOI: 10.3390/ma13051100 -
Hydroxyl (O-H) zaupanje 1,0
“LLM confirmed rule peak-group candidate”
Negrao 等 - 2021 - Mineralogical Appraisal of Bauxite Overburdens fro DOI: 10.3390/min11070677 -
Hydroxyl (O-H) zaupanje 1,0
“The major cm-1 band at 3697.36 is due to the antisymmetric stretching vibration of the O-H band [18].”
Preparation of Mg(OH)2/Calcined Fly Ash Nanocomposite for Removal of Heavy Metals from Aqueous Acidic Solutions DOI: 10.3390/ma13204621 -
Hydroxyl (O-H) zaupanje 0,9
“Stretch bands of OH group characteristic of kaolinite.”
Hildebrando 等 - 2014 - Synthesis and Characterization of Zeolite NaP Usin DOI: 10.1590/S1516-14392014005000035
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