Abstract: | A volume of 132 Å 3 is enclosed by the title compound 1 , which thus offers plenty of room for potential guest molecules. The synthesis from 2 {Cp*RhCl2}2] and 4 CpCo(CN)3]− begins with the construction of a “molecular square” whose corners are alternately occupied by Co and Rh centers. Two squares react with one another to give a “molecular box” without cleavage of any M–C bonds. Cp=C5H5, Cp*=C5Me5. |