10-Formyl-2,4,6,8,12-pentanitro-2,4,6,8,10,12-hexaazatetracyclo[5.5.0.05,9.03,11]dodecane acetone solvate

The title compound, C7H7N11O11 center dot C3H6O, consisting of one molecule of 10-formyl-2,4,6,8,12-pentanitro- 2,4,6,8,10,12-hexaazatetracyclo[5.5.0.0(5,9).0(3,11)]dodecane (pentanitromonoformyl-hexaazaisowurtzitane, PNMFIW) and one acetone solvent molecule, is a member of the caged hexaazaisowurtzitane family. PNMFIW has a cage structure which is constructed from one six-membered and two five-membered rings which are linked by a C-C bond, thus creating two seven-membered rings. In the PNMFIW molecule, one formyl group is bonded to the N heteroatom of the six-membered cycle, and five nitro groups are appended to other five N heteroatom of the caged structure. The acetone solvent molecule is arranged beside a five-membered plane of PNMFIW with an O atom and an H atom close (with respect to the sum of the van derWaals radii) to the neighbouring nitro O atom [O center dot center dot center dot O = 2.957 (3) and 2.852 (3) angstrom; O center dot center dot center dot H = 2.692 (2), 2.526 (3) and 2.432 (3) angstrom].