What absorbs at 938 cm⁻¹ in an FTIR spectrum?
A band near 938 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 8 cited sources
Brzi odgovor
A band near 938 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) | 7 | 7 | 1,0 |
| Silicon-oxygen (Si-O) | 5 | 5 | 1,0 |
| Metal oxygen | 4 | 4 | 1,0 |
| Siloxane (Si-O-Si) | 3 | 3 | 1,0 |
| Hydroxyl (O-H) | 3 | 3 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Metal hydroxyl | 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 |
|---|---|---|---|
| SnO2 | 938, 2800, 1547 | Metal oxygen | 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 938 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
-
pouzdanost 1,0
“The group of peaks from 3680 cm-1 to 3482 cm-1 intense spectral features at 938 and 3680 cm-1 correspond to the position of peaks that arise from OHstretching modes, where OHgroups are bound to Mg (serpentine and stitchtite) or Cr (stitchti”
Melchiorre 等 - 2020 - Insights on Structure and Threshold Detection Limi DOI: 10.3390/min10030215 -
Silicon (Si) pouzdanost 1,0
“except cm-1 the band at 938 which may be due to the vibrations of Si-O bond stretching in SiO 4 N”
New Er3+ doped antimony oxide based glasses: thermal analysis, structural and spectral properties DOI: 10.1016/j.jallcom.2015.07.113 -
pouzdanost 1,0
“cm-1 modes appear at 545 The peak at 938 corre- (cm-1) Wavenumber sponds to the asymmetric stretching mode of vibration of cm-1 Si-O-Si bonds.”
Synthesis and spectroscopic investigations of trivalent europium-doped M2SiO5 (M = Y and Gd) nanophosphor for display applications DOI: 10.1007/s10854-020-03076-5 -
Hydroxyl (O-H) pouzdanost 1,0
“cm-1 913 characterize free B15C5 in the spectrum of a 0.5mol/L solution of B15C5 in dinated B15C5 at 913 cm-1, 938 cm-1, and 984 cm-1 (Figures 15b and S5) decreased, the intensity of the ν(OH) bands in the range of 3700-3500 cm-1 decreased”
Study of Lithium-Extraction Systems Based on Benzo-15-Crown-5 Ether and Alkylimidazolium-BasedIonic Liquid DOI: 10.3390/molecules28030935 -
Alkyl C-H pouzdanost 1,0
“cm-1, The peaks related to C-H stretching vibration at 2901 O-H stretching vibration cm-1, at 3447 C-O stretching vibration from asymmetric oxygen bridge between 1057 cm-1, and 1113 C-O carbonyl stretching vibration from the glucose of the”
Impedance, Electrical Equivalent Circuit (EEC) Modeling, Structural (FTIR and XRD), Dielectric, and Electric Modulus Study of MC-Based Ion-Conducting Solid Polymer Electrolytes DOI: 10.3390/ma15010170 -
Metal oxygen pouzdanost 1,0
“cm1 cm-1 The peak at 938 is attributed to Sn-O-Si bond in stretching mode [5].”
Hijazi 等 - 2016 - Selective ammonia gas sensor based on SnO2-APTES m DOI: 10.1016/j.proeng.2016.11.193 -
Metal oxygen pouzdanost 1,0
“The peak at 938 is cm-1 attributed to Sn-O-Si stretch [6].”
Modified SnO2-APTES gas sensor for selective ammonia detection at room temperature DOI: 10.1016/j.matpr.2018.10.424 -
Metal oxygen pouzdanost 1,0
“The cm-1 peak at 938 is attributed to Sn-O-Si bond in stretching mode.”
Ambient temperature selective ammonia gas sensor based on SnO2-APTES modifications DOI: 10.1016/j.snb.2017.10.036
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