The [Eu
(dmso)8]
3+ complexes and [PMo12O40]
3 Keggin anions alternate:
each cationic Eu-based complex can be described as being located
at the center of a square whose vertexes are occupied by Keggin
anions, and vice versa. In this crystal structure there are a-Keggin
anions stack parallel to the three crystallographic axes and the Eu
complexes are located between the a-Keggin anions