Self-assembled nanostructures of oppositely charged metaloporphyrins

ROLANDO CARABALLO; SERGIO GOMEZ; MARIANA HAMER

Congreso; Virtual Meeting - 11th International Conference on Porphyrins and Phthalocyanines; 2021

Porphyrins and metalloporphyrins are widely used platforms for the construction of supramolecular structures. Their aromatic system allows π-π stacking interactions and, at the same time, they can be derivatized with diverse functional groups. This allows to modulate different interactions, like hydrogen bonds, electrostatic interactions, and intermetallic coordination. Following these premises porphyrins have become a versatile platform to obtain structures through self-assembly mechanisms. This potential can be observed in nature, where porphyrins assemblies act as antennas or perform catalytical reactions in biohybrid materials. Mimicking nature, we propose the synthesis of nanostructures (NS) obtained through self-assembly of water soluble porphyrins meso-tetrakis(N-methyl-4-pyridyl)porphine (TMPyP) and meso-tetrakis(4-sulfonatophenyl)porphine (TPPS) metallated at their centre.In this work we prepared and characterized NS combining ZnTMPyP4+ and TPPS with different transition metals (Mn(III) and Ni(II), shown in Figure 1, Cu(II) and Zn(II)). The resulting materials were characterized by SEM microscopy with EDS; UV-Vis and FTIR absorption spectroscopies. Different conditions were studied for the NS to obtain microcrystals that allow structure elucidation. The presence of different transition metals and the variety of morphologies opens the possibility to use these NS in catalytic applications. In this sense, their use in photochemical generation of hydrogen has been studied.