What absorbs at 464 cm⁻¹ in an FTIR spectrum?
A band near 464 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 464 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 |
|---|---|---|---|
| Metal oxygen | 4 | 4 | 1,0 |
| Silicon-oxygen (Si-O) | 4 | 4 | 1,0 |
| Silicon (Si) | 3 | 3 | 1,0 |
| Siloxane (Si-O-Si) | 2 | 2 | 1,0 |
| Carbonate | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Metal hydroxyl | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Silicon silicon | 1 | 1 | 1,0 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
Iespējamie materiāli
| Materiāls | Atbalstošie pīķi | Pārklājošās grupas | Citētie avoti |
|---|---|---|---|
| Silicate | 464, 1000, 1037 | Silicon-oxygen (Si-O), Silicon (Si), Metal oxygen | 1 |
| kaolinite | 464, 3696, 693 | Silicon-oxygen (Si-O), Silicon (Si), Siloxane (Si-O-Si) | 1 |
| quartz | 464, 800, 3053 | Silicon-oxygen (Si-O), Silicon (Si), Siloxane (Si-O-Si) | 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 464 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
“Since in GaAs the 464 cm-1 peak corresponds to the longitudinal stretching mode of the pair [5] one can imagine that when Al atoms substitute Ga atoms nearest to the SiAs cation sites the Si-Si bond will become somewhat weaker due to an Al-”
Kaczor 等 - 1995 - Silicon-related local vibrational mode absorption DOI: 10.4028/www.scientific.net/MSF.196-201.1091 -
Metal oxygen pārliecība 1,0
“FTIR vibrational cm-1 bonds between 464 and 585 confirm the interaction of metal-oxygen at tetrahedral and octahedral sites, a de-notified vibrations stretch.”
Influence of Mn dopant on the crystallite size, optical and magnetic behaviour of CoFe2O4 magnetic nanoparticles DOI: 10.1016/j.jpcs.2020.109654 -
pārliecība 1,0
“Vibrational peaks at 464 and 1089 in the IR spectrum of fly ash might have resulted from bending and asymmetric stretching of Si-O, Aerosol and Air Quality Research | https://aaqr.org”
Micro-characterization of Dust and Materials of Dust Origin at a Cement Industry Located in Bangladesh DOI: 10.4209/aaqr.220109 -
Silicon-oxygen (Si-O) pārliecība 1,0
“[144] reported a quartz peak at 464 cm-1 and a cristobalite peak at 410 µm 1 with micrometer-scale characterization, thereby improving the detection limit.”
Review of Filters for Air Sampling and Chemical Analysis in Mining Workplaces DOI: 10.3390/min12101314 -
Alkyl C-H pārliecība 1,0
“FTIR-ATR analysis of enzyme-modified gallate462 family-compounds also revealed that their alkyl chain was unaltered upon enzymatic 463 modification, while major changes were observed in the peaks of their phenolic 464 moieties.”
Cusola 等 - 2020 - Elucidating the chemical nature of laccase-modifie DOI: 10.1080/02773813.2020.1772823 -
Silicon (Si) pārliecība 1,0
“cm-1, The FTIR spectrum of the geopolymer pastes showed a band around 464 ascm-1 The FTIR spectrum of the geopolymer pastes showed a band around 464 cm-1, ascribed to the Si-O vibration.”
Sodium Silicate from Rice Husk Ash and Their Effects as Geopolymer Cement DOI: 10.3390/polym14142920 -
pārliecība 1,0
“The bending or stretching of T-O-T (T= Si or Al) bridges of cm-1 434 aluminosilicates is assigned to the band at 464 [38].”
Istuque 等 - 2019 - Effect of sewage sludge ash on mechanical and micr DOI: 10.1016/j.conbuildmat.2019.01.093 -
pārliecība 1,0
“Ti4+ 2p 2p the two strong peaks Ti (464.31 eV) and Ti (458.53 eV) are assigned to (TiO [27] and 1/2 3/2 2 Ti-OH) and the two peaks (457.01 and 462.44 eV) are attributed to Ti 2O [31].”
Deposition of TiO2 Thin Films on Wood Substrate by an Air Atmospheric Pressure Plasma Jet DOI: 10.3390/coatings9070441
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