“…Moreover, in some cases the inverse reaction can be induced thermally or by irradiation with light. [7][8][11][12][13][14] Switching of the magnetic state has been explained by a metal to metal electron transfer that changes the electronic state, and hence the spin, on the interacting metallic centers, then giving rise to a high molecular magnetic moment. 4,7,11,18,19 Specifically, for compounds of the type [Mo(CN) 2 (CN-CuL) 6 ] 8+ (L = 2,2 0 -bipyridine, tris(2-aminoethyl)amine, N,N 0 -dimethylethylenediamine), electron transfer in one of the Mo IV -Cu II pairs would lead to a situation with one Mo V -Cu I pair and five Mo V -Cu II magnetic pairs, resulting in a strong ferromagnetic interaction (J > 100 cm À1 ).…”