An Acentric, Three‐Dimensional Coordination Polymer: Synthesis and Structure of [Cu(pyrimidine) 2 ]BF 4

Coordination networks that mimic silicate mineral structures are formed by a new class of coordination polymers, which are accessible through the self‐assembly of tetrahedral copper( I ) cations and bent, bifunctional pyrimidine ligands. Thus, extended organometallic frameworks can be produced, which show optical activity (as quartz), or microporosity (as zeolites)…or both! The first example of such a framework is [Cu(pyrimidine) 2 ]BF 4 (depicted on the right), which can be described as a “stuffed feldspar”, and contains channels that house both BF   − 4ions and disordered solvent molecules.