Magnesium ferrichromate nanoparticles: an efficient and recyclable catalyst in the synthesis of pyrano[2,3-c]pyrazole derivatives

• Published in: Research on chemical intermediates 2021, Vol.47 (7), p.2669-2687
• Main Authors: Yellapurkar, Ishita, Bhabal, Sonal, Ramana, M. M. V., Jangam, Kundan, Salve, Vaibhav, Patange, Sunil, More, Paresh
• Format: Article
• Language: English
• Subjects: Catalysis; Catalysts; Catalytic activity; Chemistry; Chemistry and Materials Science; Combustion synthesis; Crystal lattices; Crystallites; Cubic lattice; Ethanol; Fourier transforms; Glycine; Infrared spectroscopy; Inorganic Chemistry; Lattice strain; Magnesium; Nanoparticles; Physical Chemistry; Pyrazole; Reaction time; Room temperature
• ISSN: 0922-6168; 1568-5675
• DOI: 10.1007/s11164-021-04435-5

Magnetically separable magnesium ferrichromate nanoparticles (MgFeCrO 4 NPs) were synthesized by aqueous combustion synthesis (ACS) using glycine as the fuel. The as-synthesized powder was characterized using XRD, FTIR, SEM–EDX and SQUID techniques. Rietveld refinement studies inferred the single-phase cubic structure of the nanoferrite. Using Williamson–Hall plot, the lattice strain and the crystallite size were evaluated. Small value of lattice strain is indicative of absence of strain in the crystal lattice. The M–O bonding at the tetrahedral as well as the octahedral position was confirmed by FTIR Spectroscopy. Morphological investigations demonstrated sphere-like nanostructures with 50–100 nm particle size using SEM. Absence of any impurity in the EDX spectrum suggests formation of extremely pure MgFeCrO 4 NPs. The room temperature magnetization was studied using vibrating sample magnetometer, and the nanoferrite exhibits superparamagnetic behaviour. The pyrano[2,3-c]pyrazole derivatives were synthesized in water/ethanol solvent system using MgFeCrO 4 NPs heterogenous catalyst. A very short reaction time, maximum yield, easy method of separation of product and environmentally safer and milder reaction conditions are some of the advantages of our work along with the retention of catalytic activity up to five cycles. Graphic abstract Synthesis of chromene derivatives using magnetically separable magnesium ferrichromate (MgFeCrO 4 ).