Polyoxometalate anion–π interaction-directed assembly of a three-dimensional hydrogen-bonded supramolecular framework with nanoscale porosity

A rare three-dimensional hydrogen-bonded supramolecular framework composed of octahedral [Cr(H3O)3(H2O)3]6+ ions and linear π-electron-deficient N,N′-di(4-pyridyl)-1,4,5,8-naphthalenediimide (DPNDI) tectons was formed in the presence of electron-rich polyoxometalates by less common noncovalent anion–π interactions, indicating that polyoxometalates dominated self-assembly with anion–π interactions.