Hydrogen‐bonded framework structures in 4‐[(4‐chloro‐3‐nitro­benzo­yl)­hydrazinocarbon­yl]pyridinium chloride and N ‐3,5‐dinitro­benzoyl‐ N ′‐isonicotinoylhydrazine

In 4‐[(4‐chloro‐3‐nitro­benzo­yl)­hydrazino­carbon­yl]­pyridinium chloride, C 13 H 10 ClN 4 O 4 + ·Cl − , the component ions are linked into a three‐dimensional framework structure by a combination of three N—H⋯Cl and five C—H⋯O hydrogen bonds. In N ‐3,5‐dinitro­benzoyl‐ N ′‐iso­nicotinoyl­hydrazine, C 13 H 9 N 5 O 6 , the mol­ecules are linked into a three‐dimensional framework structure by one N—H⋯O and three C—H⋯O hydrogen bonds, augmented by an aromatic π–π stacking inter­action.