Tunable porosity of 3D-networks with germanium nodes

Eight hyper cross-linked polymers based on tetrakis(4-ethynylphenyl)-germanium and tetrakis(4-ethynylphenyl) methane are presented. After investigation of their N-2 adsorption properties at 77 K, the porosity of the germanium-based porous organic polymers (POPs) was modulated under acidic conditions, offering an easy and direct way, in a single step, to tune the adsorption properties.