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By adopting different crystal growth methods, two novel organic-inorganic hybrids, [{Cu(phen)} 6 (H 2 O)(Te 5 Nb 15.5 Cu 0.5 O 57 )] 3.5- and its dimer, have been successfully synthesized. These are fabricated by simple compound reactions and directed by the tellurite anions, which act as heteroanion templates and linkers, as well as a pendant ligand. The compounds were characterized by IR spectra, UV/vis, thermogravimetric analysis, and single crystal X-ray diffraction. Furthermore, the solution behavior was also investigated.

The first Co-containing polyoxotantalate cluster, [H 5 Co 8 Ta 24 O 80 ] 15- , has been obtained. The tetramer has by far the highest degree of polymerization of any polyoxotantalate based on {Ta 6 O 19 } and is the largest high-nuclearity Co-cluster-containing polyoxotantalate obtained thus far. The synthesis of new polyoxotantalates has long been a challenging subject in polyoxotantalate chemistry. The findings of this study show the possibility of using Ta-based polyoxometalates as ligands to construct large aggregated structures analogous to the related Nb compounds. Therefore, the work demonstrates exciting progress in the synthesis of new polyoxotantalates.

A novel 24-niobic-2-tellurite, [H 2 Te 2 Nb 24 O 72 ] 14- , was isolated by incorporating tellurite anions into a polyoxoniobate cage. The synthesized cluster represents the first example of a sandwich-type polyoxoniobate with the largest telluroniobate aggregate. Furthermore, the hybrid material acts as an efficient catalyst for the decolorization of basic fuchsin.