Synthesis and crystal structure of tricesium undecaphosphide-ammonia(1/3)Cs3P11 center dot 3NH(3)

Cs3P11. 3NH(3) was obtainedfrom asolution of Cs3P11 in liquid ammonia. Its structure consists of P-11(3-)-cage. anions, which coordinate the cesium ca tions together with ammonia molecules, resulting in a three-dimensional net work. The compound completes a family of structures that are derived from t he binary phosphide Cs3P11 through the stepwise expanding and dismantling o f the three-dimensional network of ions by ammonia molecules of coordinatio n or through the exchange of the cesium cations for voluminous molecular ca tions.