Inside Back Cover: Nanosheet‐Assembled Zirconium‐Porphyrin Frameworks Enabling Surface‐Confined, Initiator‐Free Photosynthesis of Ultrahigh Molecular Weight Polymers (Angew. Chem. Int. Ed. 50/2023)

Hierarchical metal-organic frameworks with low-dimensional architectures provide significant thermodynamic or kinetic benefits. Yiyun Geng, Gang Ye et al. present in their Research Article (e202312697) the development of nanosheet-assembled Zr-porphyrin frameworks with broadband photon harvesting and enhanced photocatalytic ability, enabling the establishment of an initiator-free, visible-light-regulated radical polymerization for synthesis of ultrahigh molecular weight polymers (Mn>1,500,000).