[Cd₂(Te₆O₁₃)][Cd₂Cl₆] and Cd₇Cl₈(Te₇O₁₇): Novel Tellurium(IV) Oxide Slabs and Unusual Cadmium Chloride Architectures

Initial attempts to prepare new Ln−Cd−Te−O−Cl compounds led to the isolation of two novel cadmium tellurium(IV) oxychlorides with two different types of structures, namely, [Cd2(Te6O13)][Cd2Cl6] and Cd7Cl8(Te7O17). Both compounds feature novel polymeric tellurium(IV) oxide anions and unusual cadmium chloride substructures. The structure of [Cd2(Te6O13)][Cd2Cl6] is composed of 1D [Cd2Cl6]2- double chains and (002) [Cd2(Te6O13)]2+ layers. The 1D Te6O132- slab of the [Cd2(Te6O13)]2+ layer is formed by TeO3, TeO4, and TeO5 groups via corner- and edge-sharing, and it contains six- and seven-membered tellurium(IV) polyhedral rings. The structure of Cd7Cl8(Te7O17) features a 3D network with long-narrow tunnels along the b axis. The two types of structural building blocks are 1D [Te7O17]6- anions and unusual corrugated [Cd7Cl8]6+ layers based on “cyclohexane-like” Cd3Cl3 rings.