What absorbs at 817 cm⁻¹ in an FTIR spectrum?
A band near 817 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 817 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 |
|---|---|---|---|
| Aromatic ring | 5 | 4 | 1,0 |
| Methoxy (OCH3) | 4 | 4 | 1,0 |
| Methacrylate | 4 | 4 | 1,0 |
| C-O single bond | 4 | 4 | 1,0 |
| Acetate | 4 | 4 | 1,0 |
| Alkyl C-H | 4 | 3 | 1,0 |
| C c single bond | 3 | 2 | 1,0 |
| Alkene (C=C) | 2 | 1 | 1,0 |
| Hydrogen bond | 2 | 1 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Nitrogen heterocycle | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Borate | 1 | 1 | 1,0 |
| Lignin | 1 | 1 | 1,0 |
| Boron nitrogen | 1 | 1 | 0,9 |
| Sulfur heterocycle | 1 | 0 | 1,0 |
| C-S single bond | 1 | 0 | 1,0 |
| Silicon (Si) | 1 | 0 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 0 | 1,0 |
| Silicon-oxygen (Si-O) | 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 |
|---|---|---|---|
| ZnO | 817, 1400, 3430 | Methacrylate, C-O single bond, Methoxy (OCH3) | 1 |
| Fe2O3 | 817, 1130, 1631 | Methacrylate | 1 |
| lignin | 817, 1035, 1510 | Methacrylate, C-O single bond, Aromatic ring | 1 |
| PE | 817, 1414, 1700 | Methacrylate, Aromatic ring, Methoxy (OCH3) | 1 |
| PP | 817, 1700, 1043 | Methacrylate, Aromatic ring, Methoxy (OCH3) | 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 817 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
-
Aromatic ring tillid 1,0
“Weak peak appears at 817 in BA-Coir/(Py-Acetone) and Coir-BA (Py-Acetone)-C-BPO due to two adjacent aromatic Ccm-1 H bending vibration of lignin component.”
Rout 等 - 2017 - A green approach to produce silver nano particles DOI: 10.1016/j.surfin.2017.03.004 -
Alkyl C-H tillid 1,0
“As regards the broad band close to 568 cm-1, cm-1, cm-1, cm-1, cm-1 1087 2358 1191 1448 817 cm-1 and 3200 were attributed to stretching vibrations of C-H, C O, B-O and O-H bonds, respectively.”
Zhang 等 - 2019 - Synthesis of TiB2 Powders with Hexagonal Morpholog DOI: 10.1166/jnn.2019.16750 -
Acetate tillid 1,0
“some peaks, situated at 817 and 859 were assigned to the cm-1 (xi) C-O bond from cyclohexane [33];”
Bita 等 - 2023 - Diester Chlorogenoborate Complex A New Naturally DOI: 10.3390/inorganics11030112 -
C c single bond tillid 1,0
“881 sidic links, characteristic of polysaccharides structure ring 852 ------ Stretching C-C of ethyl 817”
Flores-Hernandez 等 - 2021 - Synthesis of a Biodegradable Polymer of Poly (Sodi DOI: 10.3390/polym13040504 -
N-O bond tillid 1,0
“structure.18 WS, initially no peaks were detected at 817 however, lignin-50 °C, Figure 6 shows the SEM images of the wt % WS after pyrolysis of WS at 300, 500, 700, and 900 the different foams fabricated at temperatures, for example, Figure”
Gupta 等 - 2020 - On the Design of Novel Biofoams Using Lignin, Whea DOI: 10.1021/acsomega.0c00721 -
C c single bond tillid 1,0
“The band of 817.23 was known as the stretching mode of C-C.”
Harati 等 - 2022 - Enhanced photocatalytic activity of Fe2O3@ZnO deco DOI: 10.1007/s40201-021-00758-y -
Acetate tillid 1,0
“the spectra of the silicon substrate, while that for PMMA on the klarite surface was seen at cm-1 cm-1 cm-1 622 due to C-C-O stretching, 817 (C-O-C symmetric stretching), 1000 E P”
Kundu 等 - 2021 - Identification and removal of microand nano-plas DOI: 10.1016/j.cej.2021.129816. -
Alkyl C-H tillid 1,0
“the 809-, 817-, 809-, 820-cm-1 , 809-, 817-, and 820-cm-1 peaks are δCH (out-of-plane deformation) of the triazine compound;”
Li 等 - 2019 - Blends of Cyanate Ester and Phthalonitrile-Polyhed DOI: 10.3390/polym11010054
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