[Ta₃O₃]A (A = Li, Na, K) and [Ta₃O₃]B[Ta₃O₃] (B = Ca, Sr, Ba): Sandwich‐Type Complexes Containing Ta₃O₃^– δ and π Double Aromatic Ligands

A new sandwich-type polyoxometalate constructed from penta-lacunary [HPW7O28]8− units and MnIII ion

“…In this aspect, transition-metal-substituted polyoxometalate (TMSP) is one of the most important species owing to their variety of building blocks, adjustable connection modes and tunable transition-metals ions that being accommodated [19][20][21][22][23][24][25][26]. Among the class of TMSPs, one of the greatest subclasses is the sandwich-type polyoxoanions which were obtained by accommodate paramagnetic transition-metal cations between two lacunary polyoxoanions [27][28][29][30][31][32][33][34][35]. However, despite the fact that numerous sandwich-type polyoxoanions have been synthesized, most of the lacunary POM units are limited to one to three lacunary moieties that derived from the well-known classic building units such as Keggin and Dawson-type species.…”