What absorbs at 793 cm⁻¹ in an FTIR spectrum?
A band near 793 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
Hurtigt svar
A band near 793 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.
Mulige funktionelle gruppetildelinger
| Funktionel gruppe | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 6 | 6 | 1,0 |
| Alkyl C-H | 4 | 4 | 1,0 |
| Metal oxygen | 3 | 3 | 1,0 |
| Silicon (Si) | 2 | 2 | 1,0 |
| Aromatic ring | 2 | 2 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Carbon dioxide | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Metal oxo | 1 | 1 | 0,9 |
| C-S single bond | 1 | 0 | 1,0 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| chitosan | 793, 1650, 1655 | Alkyl C-H | 1 |
| montmorillonite | 793, 1637, 523 | Silicon-oxygen (Si-O), Silicon (Si) | 1 |
| bentonite | 793, 882, 918 | Silicon-oxygen (Si-O), Silicon (Si), Metal oxygen | 1 |
| ZnO NPs | 793, 1664, 875 | Alkyl C-H, Metal oxygen | 1 |
Materialer vises kun, når den samme litteraturpulje understøtter dette bånd og mindst en yderligere karakteristisk top.
Spektrumlogik
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 793 cm⁻¹ is usually not enough for material identification by itself.
Anvendelse i virkeligheden
Denne type forespørgsel er almindelig ved polymeridentifikation, screening af ukendt plast, fejlfinding i kvalitetskontrol, verifikation af genanvendt materiale og litteraturunderstøttet gennemgang af peak-tildeling.
Almindelige fejl
- Behandling af et isoleret bånd som bevis på et materiale uden at kontrollere mindst en eller to understøttende toppe.
- Ignorerer overlap: flere funktionelle grupper kan bidrage nær samme bølgetal.
- Spring validering over, når additiver, blandinger, oxidation eller forurening kan forvrænge spektret.
Verifikationsrådgivning
Når tvetydighed fortsat består, valider hypotesen med DSC, GC-MS eller TGA, især for blandinger, nedbrudte prøver og fyldte polymerer.
Litteratur bag disse tildelinger
-
Alkyl C-H tillid 1,0
“LLM confirmed rule peak-group candidate”
Chatterjee 等 - 2013 - Nanochannel morphology of polypyrrole-ZnO nanocomp DOI: 10.1039/c3ta12796f -
Carbon dioxide tillid 1,0
“ofsoilsfromTrtoK2horizonsandA1toBhshorizonsarethecombinawhich suggests a decrease of the crystallinity of the quartz structure cm-1 tion of the bands at 797 and 778 possibly due to hydrolysis by water containing carbon dioxide (A1 to Bhs) i”
Clabel 等 - 2020 - Organo-mineral associations in a Spodosol from nor DOI: 10.1016/j.geodrs.2020.e00303 -
tillid 1,0
“Si-O-C stretching vibration Si-O-Si 793 792 Si-O-Si symmetric vibration Si-O-Si”
Ganie 等 - 2020 - Synthesis and Characterization of a New Surface-Mo DOI: 10.1155/2020/8814260 -
Aromatic ring tillid 1,0
“The strong sharp bands at 760 cm-1, 793 cm-1, and 822 cm-1 can be ascribed cm-1 cm-1, to o-disubstituted benzene ring vibration [38].”
Synthesis, Characterization and Biological Activities of New Schiff Base Compound and Its Lanthanide Complexes DOI: 10.3390/ph15040454 -
Silicon-oxygen (Si-O) tillid 1,0
“The 913 band stems from the Al-Al-OH bending mode, the 793 cm-1 band indicates the presence of quartz, the 625 band stems from out-of-plane Al-O-Si cm-1”
Rehydration Driven Na-Activation of Bentonite—Evolution of the Clay Structure and Composition DOI: 10.3390/ma14247622 -
tillid 1,0
“the aromatic nucleus, C-H [6].The C-N stretching vibration 311 (υ Ag-Cl) [8] islocatedaround1373cm-1.Thebandat793cm-1represents Stretching vibrations of the bridging halogen 250 the out-of-plane bending C-H [3, 5, 7].The relative intensity”
Benahmed 等 - 2018 - Spectroscopic Study of PolyanilineAgCl@Ag Nanocom DOI: 10.1155/2018/7320654 -
Ring structure tillid 1,0
“genipin.41 bonds in the chitosan crosslinked with The new broad peak C-C, CH, C-O and OH (ab- ---------- 2412, 793 cm-1 that appeared near 1415 after crosslinking with genipin is assosorption of glibenclamide) ciated with the ring-stretchin”
Delgadillo-Armendariz 等 - 2014 - INTERACTIONS OF CHITOSANGENIPIN HYDROGELS DURING DOI: 10.5935/0100-4042.20140243 -
Metal oxygen tillid 1,0
“On the other cm-1 hand, the band of the Al-O bond at 793 is also shifted to the right.”
Ivanovic 等 - 2020 - The Effect of the Concentration of Alkaline Activa DOI: 10.2298/SOS2002219I
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