Wavelength-Dependent Energy and Charge Transfer in MOF: A Step towards Artificial Porous Light-Harvesting System

Chromophore assemblies within well-defined porous coordination polymers, such as metal-organic frameworks (MOFs), can emulate functionality of the antenna rings of chlorophylls in light-harvesting complexes (LHCs). The chemical, electronic, and structural diversities define MOFs as a promising platform where exciton can be displaced to redox catalysts similar to the reaction center of the LHC. The precise positioning of the pigments and complementary redox units enable us to understand the charge/energy-transfer process within these crystalline solid compositions. In this study, we post-synthetically anchored tetra-phenylporphyrinato zinc(II) (TPPZn) derived complementary pigment within the 1D pores of 1,3,6,8-tetrakis(p-benzoicacid)pyrene (H4TBAPy) derived NU-1000 MOF to form a high-density donor-acceptor system. The ground and excited-state redox potentials of donor and acceptor were chosen to facilitate an energy transfer (EnT) from the excited MOF (i.e. NU-1000*) to TPPZn and a charge transfer (CT) fr...