Stacked, Twisted, and Porous: Structural Diversity in Photoactive Porphyrin-based Metal-Organic Frameworks

Abstract

We report the discovery and structural elucidation of four novel metal-organic frameworks (MOFs) constructed from Zn 2+ nodes, Pd(II) meso-tetra(4-carboxyphenyl)porphine, and adenine linkers. Despite sharing identical molecular building units, these MOFs exhibit distict structural topologies, including two polymorphs, and two frameworks featuring both Zn and Zn4O clusters. These MOFs display porphyrin stacking motifs connected via one-dimensional Zn-adenine chains, enabling tunable pore structures and surface areas up to 508 m 2 /g. Photophysical studies confirm that these MOFs efficiently sensitize singlet oxygen generation under light irradiation.