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 structures. The tubes represent a novel way to accommodate the lone pair of electrons associated with each TeIV species and suggest the possibility of redox intercalation chemistry for these types of material.

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The title compound, lithium tris[dioxidovanadium(V)] bis[trioxidotellurium(IV)], contains chains of edge-sharing distorted VO(6) octahedra. The pyramidal TeO(3) groups crosslink the chains into sheets. Finally, an Li(+) cation adopting an unusual capped trigonal-bipyramidal LiO(6) geometry bridges the layers to complete a three-dimensional structure.

Hydro­thermally synthesized Ba2CoCl2(SeO3)2 contains [001] chains of corner‐linked CoO4Cl2 [dav(Co—O) = 2.073 (3) Å and d(Co—Cl) = 2.544 (2) Å] octahedra and SeO3 groups [dav(Se—O) = 1.702 (3) Å]. These chains stack in the [100] direction, with 10‐coordinate Ba2+ cations (to seven O and three Cl) binding the chains in the [010] direction. Most of the atoms occupy special positions: Co has site symmetry 2/m and Ba, Se, Cl and one O atom have site symmetry m.