Synthesis, characterization and investigation of catalytic properties of NiCo2O4@Ni(BDC) metal-organic framework in the preparation of chromeno[2,3-b]pyridine derivatives

Metal-organic frameworks have attracted considerable attention because of their unique properties and potential applications in diverse fields. In this research, an efficient and simple method has been reported for the preparation of chromeno[2,3-b]pyridine derivatives through the multi-component reactions of salicylaldehydes, thiols and malononitrile in the presence of NiCo2O4@Ni(BDC) nanocatalyst. In this approache, the products were obtained in short reaction times and excellent yields. Moreover, the synthesized compounds were characterized by IR, 1HNMR and 13CNMR spectroscopy analysis. Also, the catalyst was fully characterized by spectroscopic techniques including field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), fourier transform infrared spectrophotometry (FT-IR), X-ray diffraction (XRD) analysis, transmission electron microscopy (TEM) and thermogravimetric analysis (TGA).