An Unusual Three-Dimensional Porous Framework Complex {[Cu(en)2][KCr(CN)6]}∞ (en: Ethylenediamine) from a Template Self-Assembly Reaction.

The crystal structure of {[Cu(en)2][KCr(CN)6]}∞ reveals a novel three-dimensional porous framework in which [Cu(en)2]2+ acts as a template and K+ as a connecting unit.