Abstract
Nowadays, the number of studies about ternary complexes where metal is coordinated by two or more ligands have been increased these complexes usually use as a homogenous catalysts for organic reactions. In this way, we report the synthesis of a heterogeneous catalyst for the first time by functionalized Zn(II) thiosemicarbazones Schiff bases and tryptophan as an auxiliary ligand complex on HY zeolite (Zn-HY-L-AA). The prepared catalyst was characterized by different methods such as FT-IR, XRD, BET, FESEM, EDX, DRS, TGA, ICP-OES, and NH3-TPD. The result confirmed the complex was successfully immobilized the HY zeolite. In addition, the preparation of a micro-meso structure catalyst with strong acid sites was confirmed by BET and NH3-TPD techniques. The Zn-HY-L-AA exhibits excellent catalytic activity for two sets of important organic reactions, preparation of polyhydroquinoline derivatives, and aldol condensation at room temperature and under solvent-free conditions. Besides following the green chemistry conditions for these organic reactions, the heterogeneous catalyst is easily separated. It can be used for recyclability up to 6 times without significant loss in catalytic activity and change in the structure after consecutive cycles. In addition, a comparison of prepared catalysts showed a high yield for two sets of organic reactions under milder conditions concerning other works.
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