Magnetic chitosan-copper nanocomposite: A plant assembled catalyst for the synthesis of amino- and N-sulfonyl tetrazoles in eco-friendly media
Jazyk angličtina Země Anglie, Velká Británie Médium print-electronic
Typ dokumentu časopisecké články
PubMed
31952615
DOI
10.1016/j.carbpol.2019.115819
PII: S0144-8617(19)31487-0
Knihovny.cz E-zdroje
- Klíčová slova
- Cu NPs@Fe(3)O(4)-chitosan, Eco-friendly, Magnetic chitosan, Nano catalyst, Polysaccharide, Tetrazoles,
- MeSH
- chitosan chemie MeSH
- katalýza MeSH
- magnetické jevy MeSH
- měď chemie MeSH
- molekulární struktura MeSH
- nanokompozity chemie MeSH
- oxid železnato-železitý chemie MeSH
- tetrazoly chemická syntéza chemie MeSH
- Publikační typ
- časopisecké články MeSH
- Názvy látek
- chitosan MeSH
- měď MeSH
- oxid železnato-železitý MeSH
- tetrazoly MeSH
A greener, cost efficient and simple method is described to prepare copper nanoparticles (NPs) immobilized on the magnetic chitosan (one of the more versatile polysaccharides) using Euphorbia falcata leaf extract as reducing/stabilizing agent. The prepared catalyst (Cu NPs@Fe3O4-chitosan) was authenticated by field emission scanning electron microscope (FESEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), Scanning transmission electron microscopy (STEM), energy-dispersive X-ray spectroscopy (EDS), thermogravimetry/derivative thermogravimetry (TG/DTG), Vibrating sample magnetometer (VSM), and elemental mapping. TEM analysis indicates that Cu NPs with average sizes in 5-10 nm range is formed on magnetic chitosan with the spherical morphology. The Cu NPs@Fe3O4-chitosan was employed as a new catalyst for the synthesis of different tetrazoles by the reaction of various secondary or tertiary cyanamides with sodium azide in water under reflux conditions. Easy separation by external magnetic field, mild reaction conditions, low cost and the reusability are some of the beneficial features of this catalyst.
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