Porous layered and open-framework mixed-valence copper tellurites

Abstract |Cu + Cl 3 |[Cu 2+ 2 (TeO 3 )] ( 1 ), |Сu + 1.7 Cl 3.8 |[Cu 2+ 4 O(TeO 3 ) 2 ] ( 2 ) and Tl + 2 [Cu 2+ 2 Te 6+ Te 4+ 6 O 18 ] ( 3 ) were obtained by CVT and hydrothermal methods in CuCl-CuCl 2 -TeO 2 and Tl 2 CO 3 -CuO-TeO 2 systems. 1 demonstrates layered topology with pores (1×0.65 nm), whereas 2 has open-framework structural architecture with two-dimensional system of channels (1.16×0.74 nm). Channels in open-framework of 3 are occupied by Tl + cations. ‘Host-guest’ structural organization of 1 and 2 with host Cu 2+ -tellurite units of different dimensionality formed by oxocentered OCu 4 tetrahedra and OCu 2 Te triangles and guest Cu + -chloride species is the result of formation from gases in CVT reactions. Oxocentered units determine basic topologies of the structures of 1 and 2 and influence their stability and properties. [Te 6+ Te 4+ 6 O 18 ] 6− polytellurite-tellurate framework in 3 can be represented as consisting of Kagome-like layers.