A ferromagnetic mixed-valent Mn supertetrahedron: Towards low-temperature magnetic refrigeration with molecular clusters

Herein we report thesynthesis and structure of a decametallic mixed-valent Mnsupertetrahedron with the ligand 2-amino-2-methyl-1,3-propanediol(ampH2); this cluster displays dominant ferromagneticexchange and a spin ground state of S=22. Furthermore,we show that the magnetic behavior of the compound isparticularly appealing in view of its possible application as anefficient low-temperature magnetic refrigerant.