{[Ag42(CO3)(CCtBu)27(CH3CN)2][CoW12O40]2}[BF4]: An Intercluster Sandwich Compound

The Earl of Sandwich: The first intercluster sandwich compound was obtained from silver alkynyl clusters and [CoW12O40]6− in a one-pot reaction. The silver block has a toroidal shape with direct contacts to two polyoxometalate anions, which close its open ends.