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
Brzi odgovor
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.
Moguće dodjele funkcionalnih skupina
| Funkcionalna skupina | Potporni dokazi | Citirani izvori | Najveća pouzdanost |
|---|---|---|---|
| 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 |
Rangiranje odražava akumulirane literaturne dokaze, a ne jedno autoritativno pravilo. Uvijek provjerite u kontekstu vašeg uzorka.
Mogući materijali
| Materijal | Potporni vrhovi | Preklapajuće skupine | Citirani izvori |
|---|---|---|---|
| magnetite | 556, 1740, 1263 | Metal oxygen, Silicon-oxygen (Si-O) | 1 |
Materijali su prikazani samo kada ista literatura podržava ovu traku i barem jedan dodatni karakteristični vrh.
Logika spektra
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.
Upotreba u stvarnom svijetu
Ova vrsta upita uobičajena je u identifikaciji polimera, probiru nepoznate plastike, rješavanju problema u kontroli kvalitete, provjeri recikliranog materijala i pregledu dodjele vrhova potkrijepljenom literaturom.
Uobičajene pogreške
- Tretiranje jedne izolirane vrpce kao dokaza materijala bez provjere barem jednog ili dva podržavajuća pika.
- Zanemarivanje preklapanja: više funkcionalnih skupina može doprinositi u blizini istog valnog broja.
- Preskakanje validacije kada aditivi, mješavine, oksidacija ili kontaminacija mogu izobličiti spektar.
Savjet za provjeru
Kada nejasnoća ostane, validirajte hipotezu pomoću DSC, GC-MS ili TGA, posebno za mješavine, degradirane uzorke i punjene polimere.
Literatura iza ovih dodjela
-
Metal oxygen pouzdanost 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 -
pouzdanost 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 pouzdanost 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 pouzdanost 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) pouzdanost 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) pouzdanost 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 pouzdanost 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 -
pouzdanost 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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