A new versatile class of hetero-tetra-metallic assemblies: highlighting single-molecule magnet behaviour.

Hetero-tetra-metallic species based on hexanuclear assemblies [((valen)M1)Ln(OH2)2(μM2(CN)8)]2(2-) (Ln = Gd(III), Tb(III); M1 = Cu(II), Ni(II) and M2 = Mo(IV), W(IV)) and co-crystallized mononuclear complexes [M3(tpy)2](2+) (M3 = Ni(II), Ru(II), Os(II)) were identified, fully characterized, and shown to constitute a new class of single-molecule magnets.