An unprecedented two-fold interpenetratedheterometallic 4664 network constructed byfive-connected copper metal nodes

Hydrothermal reactions making use of dichromate metal anion as a secondary ligand yielded a novel three dimensional, bimetallic copper(II)–chromium(VI) network with an unprecedented 4664 topology consisting of Cu(II) ions as five-connected nodes; two such networks, completely identical, interlock to generate a two-fold interpenetrated structure.