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Hydrothermally prepared SrMn(SeO(3))(2) contains infinite chains of vertex-sharing irregular MnO(5+1) polyhedra [mean Mn-O 2.226(3)A], which are fused into layers via pyramidal SeO(3) groups [mean Se-O 1.698(3)A]. Nine-coordinate Sr(2+) cations [mean Sr-O 2.715(4)A] complete the layered structure.
The polyhedral building blocks of the layered inorganic network in the mixed-valence title compound, (NH4)(V(IV)O2)(V(V)O2)(TeO3), are vertex-sharing V(V)O4 tetra-hedra, distorted V(IV)O6 octa-hedra and TeO3 pyramids, which are linked by V-O-V and V-O-Te bonds, forming double layers lying parallel to (100). The presumed Te(IV) lone-pairs of electrons appear… (More)
The hydrothermal syntheses and single-crystal structures of BaTe3O7 and BaTe4O9 are reported. These closely related new phases, which can be regarded as the n = 3 and 4 members of the BaTenO2n+1 family, are built up from infinite, tubular, columns of Te/O polyhedra (6 ring loops for BaTe3O7 and 8 ring loops for BaTe4O9) with barium cations completing the… (More)