The Eu–O distances range from 2.345 to 2.435 Å. 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 Eucomplexes are located between the a-Keggin anions