Fluorinated porous molecular crystals: vapor-triggered on–off switching of luminescence and porosity

A platinum diiodide complex with 9-pentafluorophenyl-9-arsafluorene formed a porous molecular crystal (PMC) or a non-porous molecular crystal (n-PMC), depending on the recrystallization solvents. Vapor exposure can cause reversible crystal-to-crystal transition between the PMC and the n-PMC. The PMC exhibits open–close switching of porosity as well as on–off switching of luminescence.