Structure solution of a novel aluminium methylphosphonate using a new simulated annealing program and powder X-ray diffraction data

The structure of a novel layered aluminium methylphosphonate, formula Al2(CH3PO3)3, has been solved from laboratory X-ray powder diffraction data by simulated annealing of five independent structural sub-units, revealing a combination of four- and five-fold coordinated aluminiums within the inorganic lamellae that is unique for this kind of solid.     

Catalytic reduction of 4-nitrophenol using synthesized and characterized CoS@MorphcdtH/CoS@4-MPipzcdtH nanoparticles

CoS@MorphcdtH NPs and CoS@4-MPipzcdtH NPs were synthesized by precipitation method involving three mechanisms: inclusion, occlusion, and adsorption. The synthesized NPs were characterized with the help of UV-Vis spectroscopy, FESEM-EDAX, powder x-ray diffraction, TEM, ESIMS, TG/DSC analysis. The morphology of the CoS@MorphcdtH NPs and CoS@4-MPipzcdtH NPs were hexagonal and rectangular, and the particles were in the range 7–12 nm. UV–visible spectral measurements showed surface plasmon resonance at 320 nm–340 nm with band gap of 3.65 eV–3.86 eV. The catalytically active CoSNPs called were investigated for the reduction of 4-nitrophenol (4-NP) via hydrogenation using sodium borohydride (NaBH₄) as a reducing agent. Both the CoS NPs successfully reduced 4-NP to 4- aminophenol (4-AP) in a short time, catalytic performances are almost unchanged for the first five cycles. Herein, we report the preparation and characterizations of efficient active CoS NPs consisting carbodithioic acid framework as a support/capping material, along with catalytic property.     

Recent trends in synthetic strategies using magnetic nanostructures as green catalysts in synthesis of pyran analogues

In recent years, magnetic nanoparticles and nanocomposites play an important role as a nanocatalyst in the creation of a wide range of bioactive heterocycles with extraordinarily high activity and selectivity, low energy consumption, and extended life. Among all heterocycles, many natural products, pharmaceuticals, and bioactive compounds contain pyran scaffolds which have a wide range of uses in biomedical research, industry, and medicine. Additionally, these are also widely used in the synthesis of novel heterocyclic systems as precursors. This study focused on recent advances in the last 5 years in using various magnetic recoverable and recycled nanoparticles and nanocomposites to synthesize pyran derivatives and their pharmacological activity. This article has been classified into three subsections: (i) MNPs-metal nanocomposite catalyzed reactions, (ii) MNPs-organic based nanocomposite catalyzed reactions, and (iii) MNPs-ionic liquid nanocomposite catalyzed reactions and (iv) MNPs-acid based nanocomposite to describe catalytic efficiency of magnetic nanocomposites for the synthesis of pyran derivatives. A comparative study of nanocomposites and different approaches for green synthesis of pyrans by highlighting the advantages and disadvantages along with catalyst recovery and recyclability has been mentioned, which will help scientists to probe and stimulate the study of these scaffolds.