Preparation and Solid State ~(13)C-NMR of the Four Stable Phases of 2,4,6,8,10,12-Hexanitro-2,4,6,8,10,12-hexaazatetracyclo5.5.0.0~(5.9).0~(3,11)dodecane (HNIW, CL 20)

摘要

CL 20 was prepared in a four step synthesis by a variation of Nielsen's classical method. This produced the alpha hydrated phase of CL 20. The other polymorphs were prepared by solution/precipitation in selected solventon-solvent pairs. The phase transitions obtained were alpha to beta, beta to gamma and beta to epsilon. FT-IR spectra of some polymorphs were recorded. Solid state ~(13)C NMR was done under cross polarisation conditions with magic angle spinning and a tentative assignment of the signals was attempted.