Copper β-diketonate molecular squares and their host-guest reactions

(Figure Presented) All square: Treatment of m-phenylene-bis(β- diketones) with [Cu(NH3)4]2+ yields molecular squares rather than the expected hexagons. The squares react readily with guests such as C60 (see structure) and 4,4′-bipyridine. They are also effective for the storage of H2 gas, both at 77 K and at room temperature. © 2007 Wiley-VCH Verlag GmbH & Co. KGaA