A new alkyne-based hydrocarbon cage was synthesized in high overall yield using alkyne–alkyne coupling in the cage forming step. The cage is porous and displays a moderately high BET surface area (546 m2 g–1). The cage loses crystallinity on activation and thus is porous in its amorphous form, while very similar cages have been either non-porous, or retained crystallinity on activation. Reaction of the cage with Co2(CO)8 results in exhaustive metalation of its 12 alkyne groups to give the Co24(CO)72 adduct of the cage in good yield.
Characterisation data and details of synthesis