Abstract
An X-ray structural investigation has been carried out for four polycyclic nitramines with an isowurtzitane structure. These compounds are high-density, high-energy materials: 4,10-dinitro-2,6,8,12-tetraoxa-4,10-diaza-tetracyclo(5.5.0.03,11.05,9)dodecane (4), 4,8,10,12-tetranitro-2,6-dioxa-4,8,10,12-tetrazatetracyclo (5.5.0.03,11.05,9)dodecane (5), and 4,6,10,12-tetranitro-2,8-dioxa-4,6,10,12-tetrazatetracyclo(5.5.0.03,11.05,9)-dodecane (6). Nitramine 5 crystallizes as triclinic (form α, dcalc = 1.966 g/cm3) and trigonal (form β, dcalc = 2.014 g/cm3) modifications. All amine nitrogen atoms have a nonplanar structure; the mean sum of bond angles of the six-membered cycles is 345.2°, and the corresponding mean value for the five-membered cycles is 337.6°. Other features of their intramolecular structure are also discussed.
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