What absorbs at 805 cm⁻¹ in an FTIR spectrum?
A band near 805 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
Ātra atbilde
A band near 805 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.
Iespējamie funkcionālo grupu piešķīrumi
| Funkcionālā grupa | Atbalstošie fakti | Citētie avoti | Augstākā pārliecība |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 6 | 6 | 1,0 |
| Silicon (Si) | 3 | 3 | 1,0 |
| Siloxane (Si-O-Si) | 3 | 3 | 1,0 |
| Alkyl C-H | 2 | 2 | 1,0 |
| Sulfate (SO4) | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Silicon carbon | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Boron nitrogen | 1 | 0 | 0,9 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
Iespējamie materiāli
| Materiāls | Atbalstošie pīķi | Pārklājošās grupas | Citētie avoti |
|---|---|---|---|
| SiC | 805, 791, 1136 | Silicon-oxygen (Si-O), Silicon (Si), Siloxane (Si-O-Si) | 1 |
| asphalt | 805, 1600, 1376 | Alkyl C-H | 1 |
Materiāli tiek parādīti tikai tad, ja šo joslu un vismaz vienu papildu raksturīgo pīķi atbalsta tā pati literatūras kopa.
Spektra loģika
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 805 cm⁻¹ is usually not enough for material identification by itself.
Reālās pasaules izmantošana
Šāda veida vaicājums ir izplatīts polimēru identificēšanā, nezināmas plastmasas skrīningā, kvalitātes kontroles problēmu risināšanā, pārstrādāto materiālu pārbaudē un ar literatūru pamatotā pīķu piešķīruma pārskatā.
Biežākās kļūdas
- Vienas izolētas joslas uzskatīšana par materiāla pierādījumu, nepārbaudot vismaz vienu vai divus atbalsta pīķus.
- Ignorējot pārklāšanos: vairākas funkcionālās grupas var dot ieguldījumu tuvu tam pašam viļņa skaitlim.
- Izlaist validāciju, ja piedevas, maisījumi, oksidācija vai piesārņojums var izkropļot spektru.
Verifikācijas padoms
Ja joprojām pastāv neskaidrība, apstipriniet hipotēzi ar DSC, GC-MS vai TGA, īpaši maisījumiem, noārdītiem paraugiem un pildītiem polimēriem.
Literatūra aiz šiem piešķīrumiem
-
pārliecība 1,0
“In addition, the bands at 805.22 are occupied by the phosphate group of the binding cm(cid:0) 1 Si-O and the strong stretching silicon group of the binding.”
Biologically-induced synthetic manganese carbonate precipitate (BISMCP) for potential applications in heavy metal removal DOI: 10.1016/j.heliyon.2023.e15919 -
Sulfate (SO4) pārliecība 1,0
“LLM confirmed rule peak-group candidate”
Fauzi 等 - 2020 - Characterization, Disintegration, and Dissolution DOI: 10.1155/2020/3565931 -
Hydroxyl (O-H) pārliecība 1,0
“CR occurs at the peak of 1261 1094 1031 804.7 and 667 cm-1, cm-1 cm-1 The absorption peaks at 1261 1094 and 1031 are identified as the bending vibrations of O-H, stretching vibrations of C-O and stretching vibrations of 804.7cm-1 S=O, respe”
Liang 等 - 2017 - Thermo-stability and aging performance of modified DOI: 10.1016/j.matdes.2017.04.060 -
Metal oxygen pārliecība 1,0
“The cm-1 intense transmittance band at 805 is due to vibrating Figure 6 displays the UV-visible spectra of YVO4:5%Dy, modes of stretching frequency of V-O bonds in YVO Eu (1 mol%, 3 mol%, 5 mol% and 7 mol%) nanophosphor.”
Synthesis and luminescence properties of europium-codoped and dysorium-doped YVO4 nanophosphor for potential applications DOI: 10.1007/s00339-019-2990-1 -
pārliecība 1,0
“1.0 corresponded to the asymmetric vibration of the siloxane ml/min) to pH = 9 with 150 ml of 3.0 mol/L HNO containcm-1 bond Si-O-Si, and the band at 805 was assigned to the 3”
Adam 等 - 2012 - Liquid Phase Oxidation of Acetophenone over Rice H DOI: 10.1016/S1872-2067(11)60361-6 -
pārliecība 1,0
“(cid:2)460, vibration patterns of KIT-6 centered at 805, 970, and crystalline emulsion with the crystallization time of 24 h cm(cid:4)1.29 cm(cid:4)1 1080 The adsorption band around 460 represents could be easily assembled using a mesoporou”
Synthesis of ZSM-5/KIT-6 with a tunable pore structure and its catalytic application in the hydrodesulfurization of dibenzothiophene and diesel oil DOI: 10.1039/c8ra05675g -
Silicon carbon pārliecība 1,0
“5a, top plot) show a distinct (possibly crystalline) cm-1, which corresponds to the transverse optical vibrational mode of SiC, along with a shoulder where peak at 805 cm-1, which corresponds to the lateral optical vibrational mode of SiC [”
Henry 等 - 2018 - Characterization of Ceramic Matrix Composite Degra DOI: 10.1063/1.5031613 -
Hydroxyl (O-H) pārliecība 1,0
“It also shows reduced absorbance in the 805 and OH deformation vibrations and CO stretching vibrations (phecm-1 gion, which is associated with the sulfate group of the 3,6-anhynols) can be found.”
A novel biodegradable film based on κ‐carrageenan activated with olive leaves extract DOI: 10.1002/fsn3.1554
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