[Ag₂M(Te₂O₅)2]SO₄ (M = Ce^IV or Th^IV): A New Purely Inorganic d/f-Heterometallic Cationic Material

Two new isotypic d/f-heterometallic purely inorganic cationic materials, [Ag₂M(Te₂O₅)₂]SO₄ (M = Ce^IV or Th^IV), were synthesized using the metal oxides (MO₂ and TeO₂), silver nitrate, and sulfuric acid under mild hydrothermal conditions. The prepared materials were characterized via single-crystal X-ray diffraction, which revealed that the materials possess a 3D framework of corner-sharing Te₂O₅ ^2- units. The tellurite framework creates four unique pores, three of which are occupied by the M^IV and Ag^I metal centers. The tellurite network, metal coordination, and total charge yield a cationic framework, which is charge-balanced by electrostatically bound sulfate anions residing in the largest of the four framework pores. These materials also possess Ag^I in a ligand-imposed linear geometry.