Design, Preparation and Characterization of MoO3H-functionalized Fe3O4@SiO2 Magnetic Nanocatalyst and Application for the One-pot Multicomponent Reactions.

Mahtab Kiani,Mehrnoosh Hendijani,Ali Zamanian,Mohammad Mohammadipour

doi:10.17344/acsi.2017.3208

Abstract

Molybdic acid-functionalized silica-based Fe3O4 nanoparticles (Fe3O4@SiO2-MoO3H) are found to be a powerful and magnetically recyclable nanocatalyst. The morphology and structure of this nanocatalyst were investigated by Fourier transform infrared spectroscopy (FT-IR), energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM), thermo gravimetric analyses (TGA), X-ray diffraction (XRD) and vibrating sample magnetometer (VSM) techniques. The high catalytic activity of this catalyst was investigated in the synthesis of pyrano[2,3-c]chromenes, representing potent biologically active compounds. The catalyst can be readily separated by applying an external magnet device and recycled up to 8 times without significant decrease in its catalytic activity, which makes it highly beneficial to address the industrial needs and environmental concerns. Fe3O4@SiO2-MoO3H has many advantages, such as low cost, low toxicity, ease of preparation, good stability, high reusability and operational simplicity.

Highlights

IntroductionThe design and synthesis of efficient, reusable, separable, low toxicity, low cost, and insoluble acidic nanocatalysts have become an important area of research in chemistry.[1] The use of nanoparticles as heterogeneous catalysts has attracted considerable attention because of the interesting structural features and high levels of catalytic activity associated with these materials.[2]
Nowadays, the design and synthesis of efficient, reusable, separable, low toxicity, low cost, and insoluble acidic nanocatalysts have become an important area of research in chemistry.[1]
We demonstrate high catalytic activity of this new catalyst in the synthesis of pyrano[2,3-c]chromenes as potent biologically active compounds

Summary

Introduction

The design and synthesis of efficient, reusable, separable, low toxicity, low cost, and insoluble acidic nanocatalysts have become an important area of research in chemistry.[1] The use of nanoparticles as heterogeneous catalysts has attracted considerable attention because of the interesting structural features and high levels of catalytic activity associated with these materials.[2]. Magnetic nanoparticles (MNP) are widely applied in various fields, such as magnetic resonance imaging (MRI) contrast agents, biomedical science, bioseparation and hyperthermia.[3,4,5,6] Transition metal nanoparticles are used as efficient catalysts for various synthetic organic transformations due to their high surface area-to-volume ratio and coordination sites which are mainly responsible for their catalytic activity.[7] Because the Fe3O4 nanoparticles will aggregate quickly into large bunches and lose their unique properties, various surface modification methods have been developed to modify the surface of naked Fe3O4 nanoparticles to improve the dispersibility, stability, biocompatibility and biodegradability for specific purposes. The silica coating is a very good surface modifier, Kiani et al.: Design, Preparation and Characterization

Methods

Results

Conclusion