A Tellurium-Substituted Heteropolyniobate with Unique π-π Stacking and Ionic Conduction Property.

A tetratellurium-substituted heteropolyoxoniobate with the formula K2H[Cu(phen)(H2O)]4[Cu(phen)]2[(LiNb8Te4O40)]·34H2O (1; phen = 1,10-phenanthroline) was hydrothermally prepared and structurally characterized. The compound represents the first hexavalent tellurium-substituted Keggin-type polyoxometalate (POM) so far. What is more, the POM cluster in 1 can elaborately self-assemble into a stable supramolecular framework with an ion conduction property through unique intermolecular π-π stacking.