Hexamethylenetetrammonium salts, composed of energetic anions 3,5-dinitropyrazolate, 4,5-dinitroimidazolate, 3,5-dinitro-1,2,4-triazolate, 5-nitrotetrazolate, perchlorate, nitrate and azide, were synthesized and characterized. The structure of N-methyl-hexamethylenetetrammonium 3,5-dinitro-1,2,4-triazolate (6) was confirmed by X-ray analysis. The standard enthalpies of formation for the new salts were cal-