A high dimensional oxysulfide built from large iron-based clusters with partial charge-ordering

Herein we report the original Ba 10 Fe 7.75 Zn 5.25 S 18 Si 3 O 12 oxysulfide which crystallizes in a new structural type. Contrary to the usual oxychalcogenides, it crystallizes with a non-centrosymmetric 3D spatial network structure built from large magnetic clusters consisting of twelve (Fe 2+/3+ /Zn)S 3 O tetrahedra decorating a central Fe 2+ S 6 octahedron and exhibiting a spin glass state. We report the original non-centrosymmetric Ba 10 Fe 7.75 Zn 5.25 S 18 Si 3 O 12 oxysulfide which crystallizes in a new structural type. Contrary to usual oxychalcogenides, it crystallizes with a 3D spatial network structure built from large magnetic clusters.