Terpyridine-Pr-Fe3O4@boehmite nanoparticles; a novel and highly effective magnetic nanocatalyst for preparation of cyclic carbonates from carbon dioxide and epoxides under solventless conditions

Add time:08/14/2019    Source:sciencedirect.com

In this research work, moisture- and air-stable terpyridine-mediated magnetic boehmite (terpyridine-Pr-Fe3O4@boehmite) nanocatalyst was fabricated and applied for the synthesis of cyclic carbonates. The nanocatalyst was constructed by very simple process using commercially available starting materials and fully characterized through various techniques including FT-IR, VSM, SEM, TGA, N2 adsorption-desorption isotherm, elemental analysis and leaching test. The characterizations results suggested the superparamagnetic nature of the Fe3O4 nucleus encapsulated by a boehmite nanoparticles shell. Further, nanoparticles could be used safety in organic reactions owing to large thermal stability of around 300 °C and can be applicable under strong acidic and basic reaction conditions. Additionally, the nanoparticles were of hexagonal like shape, uniformly distributed and much uniform in size, with an average size about 50 nm. Terpyridine-Pr-Fe3O4@boehmite nanoparticles were applied as nanocatalyst for the synthesis of cyclic carbonates form the cycloaddition coupling reaction of CO2 with epoxides under solventless conditions. The cost-effective nanocatalyst tolerated a broad variety of functional groups. The one-pot and practical procedure offers numerous benefits such as good to excellent yields, environment-friendliness, low catalyst loading and operational simplicity. Additionally, the durability of catalyst was investigated and observed that the catalyst is stable under the reaction conditions and could be isolated easily from the reaction content by using a bar magnet and reused for several consecutive cycles without any important loss of catalytic potency.

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