فروغ بكائي

This research focuses on the synthesis and photocatalytic performance eva‎luation of mixed-metal-organic frameworks (MM-MOFs) and their comparison with monometallic counterparts, based on porphyrin and metalloporphyrin ligands, for the conversion of 1,5-dihydroxy naphthalene (DHN) to Juglone. This transformation is significant as it converts a toxic substance into a biocompatible and natural compound, which serves as an important building block in the synthesis of anthraquinones. MM-MOFs exhibit improved properties compared to their monometallic counterparts. In this study, the incorporation of secondary metal ions into the mineral nodes of the bimetallic system allows for synergistic effects, enhancing the photocatalytic activity. MM-MOFs utilizing versatile multi-functional organic linkers such as porphyrins demonstrate superior performance compared to single-functional linkers. Furthermore, it was found that manganese-substituted porphyrin ligands can enhance the synergistic interactions between metal nodes, leading to increased stability and improved functional properties of the structure. These structures are still under development, and limited information is available on such frameworks. Photocatalytic reactions were performed using different molar ratios of Cobalt/Nickel and Cobalt/Zinc as metal nodes, along with porphyrin (TCPP) and metalloporphyrin (Mn-TCPP) as linkers. The highest photocatalytic efficiency for MM-MOFs was achieved with a 1:3 ratio of zinc/cobalt nodes and a manganese-containing porphyrin ligand (Zn75%/Co25% TCPP-Mn), reaching 72%, and with a 1:1 ratio of nickel/cobalt nodes and a manganese-containing porphyrin ligand (Ni50%/Co50% TCPP-Mn), reaching 69%. The synthesized photocatalysts were characterized using various identification techniques. Additionally, various factors affecting the photocatalytic process, including solvent, oxidant, light source, photocatalyst amount, and reaction time, were optimized. In addition, quenching experiments were conducted to determine the photocatalytic mechanism. Furthermore, the reusability of these photocatalysts was investigated, yielding promising results. The results of this study demonstrate the innovative potential of metal-organic frameworks, which utilize metal mixing and employ metal-containing porphyrin linkers as efficient photocatalysts for the conversion of DHN to Juglone, aiming to achieve enhanced functional properties of these compounds in the field of photocatalytic activities.

چارچوب‌هاي فلز-آلي مخلوط دو فلزي، فوتوكاتاليزور، اثر هم‌افزايي، ليگاند پورفيريني، جاگلون.

Mixed-Metal-Organic Frameworks, photocatalysis, synergistic effects, porphyrin ligand, Juglone.

Forough Bokaei

Prof. Rahmatollah Rahimi Dr. Mahboubeh Rabbani