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چکیده
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Covalent organic frameworks (COFs) as a new class of porous organic materials, are assembled from organic monomers interconnected by covalent bonds. In the last decades, due to various applications of COFs such as energy storage, gas adsorption, drug delivery as well as catalytic processed, these materials great more attention. Distinguishingly, compositional characteristics of these materials such as ordered pore size, metal-free backbone, good thermal/chemical stability, low density, vast surface area and easy modification makes them as a highly promising paradigm ]1-2[. In recent years, much attention has been directed towards the synthesis of 3-benzyl-substituted 4-hydroxycoumarins, particularly α-aminobenzyl-4- hydroxycoumarin derivatives owing to their tremendous application in various research fields such as biological science and medicinal chemistry ]3[. In this research, the catalytic application of QC-COF@Nb2O5 was investigated in the synthesis of α-aminobenzyl-4- hydroxycoumarins
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