What absorbs at 3738 cm⁻¹ in an FTIR spectrum?
A band near 3738 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 3738 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) | 4 | 4 | 1,0 |
| Silanol (Si-OH) | 2 | 2 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 1 | 1,0 |
| Silicon (Si) | 2 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 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 | 3738, 1100, 1080 | Silicon-oxygen (Si-O), Silicon (Si), Hydroxyl (O-H) | 1 |
| magnetite | 3738, 1740, 1263 | Hydroxyl (O-H), Silicon-oxygen (Si-O) | 1 |
| zeolite | 3738, 1013, 1245 | 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 3738 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
“In addition, three additional pronanoshapes preserved their shapes during reaction, The CeO 2 cm(cid:2)1 are obnounced hydroxyl bands at 3738, 3602, and 3253 as evident from TEM images of samples after reaction (see the served for cubes.”
Exposed Surfaces on ShapeControlled Ceria Nanoparticles Revealed through ACTEM and WaterGas Shift Reactivity DOI: 10.1002/cssc.201300651 -
Silanol (Si-OH) zaupanje 1,0
“cm-1 3261 as well as one negative band at 3738 The FTIR band at 3738 is attributed to internal silanol groups in line with earlier works [49].”
Baran 等 - 2016 - Influence of the nature and environment of cobalt DOI: 10.1016/j.micromeso.2015.12.061 -
Hydroxyl (O-H) zaupanje 1,0
“In the OH stretching region one can see the band at 3738, which at 77K reveals a structure of three”
Belykh 等 - 2019 - Deep insight into CO adsorption on Ni-USY zeolite DOI: 10.1016/j.apcata.2019.117140 -
Carboxyl (COOH) zaupanje 1,0
“The FTIR spectrum of MB shows the newly appeared cm-1 band at 3738 due to bridging and bidentate coordination between the carboxyl group of boswellic acid and Fe Fig.”
Eco-friendly adsorbents based on abietic acid, boswellic acid, and chitosan/magnetite for removing waste oil from the surface of the water DOI: 10.1007/s11356-022-20169-2 -
Silicon (Si) zaupanje 1,0
“S5), showing only one band at 3738 cm-1 in the O-H region characteristic of terminal Si-OH group (Deka et al., 1998).”
Hamoud 等 - 2019 - Photo-assisted SCR over highly dispersed silver su DOI: 10.1016/j.apcatb.2019.02.022 -
Aromatic ring zaupanje 1,0
“Explicit assignment in text: 'wave number of 3738.05 refers to aromatic group cm-1 (C-H)'”
Maruddin 等 - 2022 - Effects of drying methods and acidic strength on p DOI: 10.15586/ijfs.v34i1.2010 -
zaupanje 1,0
“8 of large amounts terminal silanol group (Si-O-H) located at internal and external 9 cm-1 surface of FS by a detectable intense peak at 3738 [73].”
Modified fibrous silica for enhanced carbon dioxide adsorption: Role of metal oxides on physicochemical properties and adsorption performance DOI: 10.1016/j.apcatb.2018.11.040
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