Control over the nucleation process determines the framework topology of porous coordination polymers

In this contribution, we present a method to selectively synthesize crystal polymorphs of [Zn-2(bdc)(2)(dabco)](n) (1) and [Zn-2(bdc)(2)(bpy)](n) (2), either the pillared 2D square-grid nets (1(sql) or 2(sql)) or the pillared 2D Kagome nets (1(kgm) or 2(kgm)) by simply changing the crystallization temperature.