What absorbs at 693 cm⁻¹ in an FTIR spectrum?
A band near 693 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 693 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-oxygen (Si-O) | 6 | 5 | 1,0 |
| Silicon (Si) | 4 | 4 | 1,0 |
| Metal oxygen | 2 | 2 | 1,0 |
| Aromatic ring | 2 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Metal hydroxyl | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Nucleic acid | 1 | 1 | 1,0 |
| Phosphate (PO4) | 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 |
|---|---|---|---|
| kaolinite | 693, 3696, 798 | Silicon-oxygen (Si-O), Silicon (Si), Metal oxygen | 2 |
| bone | 693, 1649, 1660 | Silicon-oxygen (Si-O) | 1 |
| hematite | 693, 1030, 469 | Silicon-oxygen (Si-O), Silicon (Si), 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 693 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 peak at 693 is associated with Fe-O bands cm-1 of MNPs.”
Covalent diphenylalanine peptide nanotube conjugated to folic acid/magnetic nanoparticles for anti-cancer drug delivery DOI: 10.1016/j.jddst.2017.06.005 -
Silicon (Si) pouzdanost 1,0
“In the spectra of WFD (Figure 7a), the peaks at 992, 776, and 693 cm-1 were attributed to Si-O stretching vibration bands, whereas the peaks at 598 cm-1 corresponded to F-O bond stretching.”
Kim 等 - 2022 - Removal of Methyl Red from Aqueous Solution Using DOI: 10.3390/ijerph19159030 -
Metal oxygen pouzdanost 1,0
“Contrary to vibration of the Ti-O-O was identified from the band 693cm-1 film within visible absorption peaks arose in undoped TiO2 [16].”
Gokdemir 等 - 2014 - Structural Modification of Sol-Gel Synthesized V2O DOI: 10.1155/2014/795384 -
pouzdanost 1,0
“790 Si-O stretching, Si-O-Al stretching, (Al, Mg)--O-H, Si-O-(Mg, Al) stretching 693 Si-O stretching, Si-O-Al stretching 538 Si-O bending, Si-O-Al stretching”
The Fourier transform infrared spectroscopy (FTIR) analysis for the clay mineralogy studies in a clastic reservoir DOI: 10.1007/s13202-021-01449-y -
Phosphate (PO4) pouzdanost 1,0
“which have absorbance maximum at 1,693 cm-1 The region between 1,180 and 1,300 corresponds to the P=O asymmetric band (mostly in nucleic acids”
Synchrotron-based FTIR microspectroscopy of protein aggregation and lipids peroxidation changes in human cataractous lens epithelial cells DOI: 10.1038/s41598-020-72413-9 -
pouzdanost 1,0
“vibrational bands at 3696, 3670, 3653 (surface hydroxyl groups stretching vibration), 3621 (Al2Si2O5(OH)4) disclosed vibrational bands at 3696, 3670, 3653 cm-1 (surface hydroxyl groups cm-1 cm-1 (inner hydroxyl groups stretching vibration),”
Ma 等 - 2019 - Investigation of the Optical, Physical, and Chemic DOI: 10.3390/su11143803 -
Aromatic ring pouzdanost 1,0
“the pure drug showed the characteristic peaks at 1650.76 due to C=O stretching, at 3364.90 due to O-H stretching, 3252.43 due to N-H stretch, 1435.82 due to C-F stretching, 1316.56 due to C-O stretching, 1217.08 due to C-N stretching, and a”
Dissolution Improvement of Atorvastatin Calcium using Modified Locust Bean Gum by the Solid Dispersion Technique DOI: 10.3797/scipharm.1301-23 -
Silicon (Si) pouzdanost 1,0
“5, from which it can be seen that these decorations contained highly comparable spectral features: Si-O stretching vibrations of alucm-1) minosilicate minerals (at about 1000 and quartz bands at 797, 779 and 693 cm-1.20 It can therefore be”
{Physicochemical characterisation of pottery from Vinca culture, Serbia, regarding firing temperature and decoration technique} DOI: 10.2298/JSC160823100P
Imate li spektar s ovom vrpcom?
Prenesite svoj FTIR spektar i dobijte potpuno izvješće o interpretaciji — dodjele vrhova s literaturnim citatima, podudaranja knjižnice i lanac dokaza s ocjenom pouzdanosti — u sekundama.