Cluster-to-metal magnetic coupling: synthesis and characterization of 25-electron (Re(sub 6-n)Os(sub n)Se8(CN)[sub 6])(super [5-n]-) (n=1,2) clusters and {Re(sub 6-n)Os(sub n)Se8[CNCu(Me6tren)]6}(super 9+) (n= 0,1,2) assemblies

A face-capped octahedral cluster with 25 metal-based valence electrons- specifically, [Re4Os2Se 8(CN)6](super 3-) is capable to participate in magnetic exchange coupling. The observed ferromagnetic coupling with appended Cu(super II) centers is weak as a result of the cluster spin being diluted over its sizeable core.