What absorbs at 556 cm⁻¹ in an FTIR spectrum?
A band near 556 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 556 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 | 3 | 3 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 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 |
|---|---|---|---|
| magnetite | 556, 1740, 1263 | Metal oxygen, Silicon-oxygen (Si-O) | 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 556 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
-
Metal oxygen pārliecība 1,0
“FT-IR confirmed the formation 19 cm-1 20 of the CdO NPs by the presence of strong and sharp peaks at 556 and 602 (Cd-O 21 stretching).”
Hassanien 等 - 2019 - Novel green route to synthesize cadmium oxide@grap DOI: 10.1088/2053-1591/ab23ac -
pārliecība 1,0
“The FTIR spectrum showed a peak at 556 corresponding to the Mg-N stretching.”
Removal of hazardous pollutants from wastewater: Catalytic applications of Mg nanoparticle functionalized aminoclay DOI: 10.1016/j.molliq.2019.112005 -
Metal oxygen pārliecība 1,0
“) exist at Besides, vibration peak of S-O(SO metakaolin content increases to 10%, large areas of aggregates bending vibration peaks corresponding to Al-O bond also peelofffromthesurfaceofMK10concrete.Itsexposedamountof 556.2cm-1.”
Chen 等 - 2021 - Study on Metakaolin Impact on Concrete Performance DOI: 10.3389/fmats.2021.788079 -
Metal oxygen pārliecība 1,0
“ence of moisture, and at 1120 cm-1 longitudinal Si-O stretching, between 1000 cm-1 and 1030 cm-1 Si-O stretching due to the presence of quartz, O-H folding at 911 cm-1 from internal hydroxyl, Si-O folding at 753 cm-1, perpendicular stretchi”
Development of an Epoxy Matrix Hybrid Composite with Astrocaryum Aculeatum (Tucumã) Endocarp and Kaolin from the Amazonas State in Brazil DOI: 10.3390/polym15112532 -
Silicon (Si) pārliecība 1,0
“The band at 556 can be attributed to the symmetric Si-O-Si stretching and O-Si-O bending vibrations of the LTA 4-member ring [53].”
Recycling of Waste Solution after Hydrothermal Conversion of Fly Ash on a Semi-Technical Scale for Zeolite Synthesis DOI: 10.3390/ma14061413 -
Alkene (C=C) pārliecība 1,0
“DIMEB and TRIMEB CDs inclusion complexes were measured significant shift of both C=O and C=C vibration modes was ob556 Beilstein J.”
Interactions between 4-thiothymidine and water-soluble cyclodextrins: Evidence for supramolecular structures in aqueous solutions DOI: 10.3762/bjoc.12.54 -
Alkyl C-H pārliecība 1,0
“Distinct absorption bands located at 2950 and 2872 cm-1 are attributed to C-H stretching vibrations, while at 556 cm-1 to C-H bending vibrations.”
Chemical Doping of a Silica Matrix with a New Organic Dye from the Group of Heterocyclic Compounds—Chemical, Optical and Surface Characteristics DOI: 10.3390/cryst12040478 -
pārliecība 0,9
“Strong absorption at 556 cm-1 for IONP attributed to magnetite.”
Surface Functionalization of Magnetite Nanoparticles with Multipotent Antioxidant as Potential Magnetic Nanoantioxidants and Antimicrobial Agents DOI: 10.3390/molecules27030789
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