“…22 Heats of formation were determined for seven of the new substituted imidazolium salts (23,24,30,31,32,34,35). Interestingly, while the 5-nitro perchlorate and nitrate salts (23,24) have quite high negative heats, the 2-azido salts (34,35) have modestly high positive AHfs but rather high Tm values. Not surprisingly, 34 (perchlorate) has a positive AHf that is -3.5 times larger than 35 (nitrate).…”