Development of a New Heteropolyoxotantalate Cluster for Multidimensional Polyoxotantalate Materials.

A unique heteropolyoxotantalate (hetero-POTa) cluster [P 2 O 7 Ta 5 O 14 ] 7- (P 2 Ta 5 ) was first developed using pyrophosphate as a key to open the ultrastable skeleton of the classical Lindqvist-type [Ta 6 O 19 ] 8- precursor. The P 2 Ta 5 cluster can serve as a general and flexible secondary building unit to create a family of brand-new multidimensional POTa architectures. This work not only promotes the limited structural diversity of hetero-POTa but also provides a practical strategy for new extended POTa architectures.