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 [Zn2(bdc)2(dabco)]n (1) and [Zn2(bdc)2(bpy)]n (2), either the pillared 2D square-grid nets (1sql or 2sql) or the pillared 2D Kagomé nets (1kgm or 2kgm) by simply changing the crystallization temperature.