Metal organic frameworks (MOFs) are a class of ultraporous materials fabricated by assembling metal ions with organic ligands in appropriate solvents, which have been attracted considerable attention because of their exceptionally high accessible surface area, diverse structural topologies as well as tuneable functionalities. These characteristics make them show remarkable capabilities in a variety of application areas, including gas storage, separation, catalysis, and drug delivery [1-2]. Another material that has been the center of attention among researches who work on new materials with new applications is magnetic nanoparticles (MNPs). To synthesis MNPs, several methods have been developed depending on the target compounds [3]. The combination of functional MNPs with MOFs results in the formation of magnetic frameworks composites (MFCs) which is in the center of attention among most of the scientists who work in this field to improve their properties [4]. In this paper, Cr-based magnetic metal organic framework as a novel and heterogeneous catalyst with phosphorus acid tags was synthesized and fully characterized by using various analysis techniques. This magnetic metal-organic frameworks (MMOFs) was applied in the synthesis of new pyrazolo[3,4-b]pyridine-5-carbonitriles.
