Synthetic metalloporphyrins (MP) are bioinspired molecules on Iron Protonporphyrin IX, which is present in all living-being species. MP are known for great catalytic and selective efficiency towards a scope of reactions, whereby results in products of chemical and pharmaceutical interest, for instance: ketone, alcohol, epoxide, and CO2-fixation products [1]. When evaluating MP as a catalyst in homogeneous medium, some issues can commonly be observed, such as biomolecular interactions leading to catalyst deactivation, and difficulty on catalyst recovering since it is solubilized in the reaction medium. Therefore, immobilizing MP onto solids support comes as an alternative for overcoming such drawbacks since the side reactions are avoided and the catalyst is easily recovered by centrifugation, for example [2]. At the same time, most of the catalytic studies regarding these solids take place in a single-step catalytic reaction which makes expensive the catalyst reuse and contributes to reactant wastes. Considering these points, sequential reactions arise as a more efficient usage of catalyst and reactants involved in the process [3]. Consequently, idealizing solids support becomes important since the combination of specific compounds can bring new properties to the final catalytic solid. Hereby is reported the preparation of core@shell solid types, mainly composed by magnetite (Fe3O4) as core and layered solids, such as layered double hydroxides (LDH) or layered hydroxide salts (LHS), as shell, evaluating diverse conditions of preparation, for further different MP e.g. [M(TDFSPP)] (Figure), where M = Fe3+ (Figure), Mn3+, Zn2+ or Mg2+ immobilization. The solid supports were analyzed by XRD, TEM, SEM, TGA techniques. These solids will be studied in different single and sequential reactions, such as cycloalkene oxidation followed by CO2 cyclic addition.
REFERENCES
[1] D. Dolphin, T.G. Traylor, L.Y. Xie, Acc. Chem. Res. 30 (1997) 251.
[2] G.S. Machado, G.G.C. Arízaga, F. Wypych, S. Nakagaki, J. Catal. 274 (2010) 130-141.
[3] E. H. Santos, C. Carvalho, C. M. Terzi, S. Nakagaki, Molecules, 23 (2018) 2796.