Stacked, twisted, and porous: structural diversity in photoactive porphyrin-based metal–organic frameworks

We report the discovery and structural elucidation of four novel metal-organic frameworks (MOFs) constructed from Zn²⁺ nodes, Pd(II) <i>meso</i>-tetra(4-carboxyphenyl)porphine, and adenine linkers. Despite sharing identical molecular building units, these MOFs exhibit distinct structural topologies, including two polymorphs, and two frameworks featuring both Zn and Zn₄O clusters. These MOFs display porphyrin stacking motifs connected <i>via</i> one-dimensional Zn-adenine chains, enabling tunable pore structures and surface areas up to 508 m² g^-1. Photophysical studies confirm that these MOFs efficiently sensitize singlet oxygen generation under light irradiation.