Giant Crown‐Shaped Polytungstate Formed by Self‐Assembly of Ce^III‐Stabilized Dilacunary Keggin Fragments

Abstract

The largest tungstogermanate and third-largest polytungstate (see picture) was obtained by K+-directed self-assembly of three unprecedented types of [GeW10O38]12− fragments stabilized by coordination of Ce ions on the vacancies. In its Ce6O42 central ring, which displays antiferromagnetic interactions, a K+ cation is captured by internal water molecules. Gray octahedra WO6, green tetrahedra GeO4; Ce orange, K purple, O red.