A Porous Coordination Network Catalyzes an Olefin Isomerization Reaction in the Pore

All-trans retinal efficiently diffused into the pore of a porous coordination network consisting of Znl(2) and an electron-deficient triazine-cored ligand. Enclathrated retinal was isomerized into the 13-cis form and easily replaced with all-trans retinal in solution, thus revealing the catalysis of retinal isomerization by the porous network.