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1.  2-Cyclo­pentyl­idenehydrazine­carboxamide 
The asymmetric unit of the title compound, C6H11N3O, consists of two independent mol­ecules in which the cyclo­pentane rings adopt envelope conformations with CH2 grouping as the flap and the semicarbazone groups are essentially planar, with maximums deviation of 0.0311 (12) and 0.0285 (12) Å. In the crystal, N—H⋯O, N—H⋯N and C—H⋯O hydrogen bonds link the mol­ecules to form sheets lying parallel to the ab plane.
doi:10.1107/S1600536812034599
PMCID: PMC3435698  PMID: 22969569
2.  Bis(4-amino­pyridinium) sulfate monohydrate 
The asymmetric unit of the title compound, 2C5H7N2 +·SO4 2−·H2O, contains two 4-amino­pyridinium cations (A and B), a sulfate dianion and a water mol­ecule. One of the 4-amino­pyridinium cations (B) is disordered over two orientations with refined site occupancies of 0.568 (4) and 0.432 (4). The non-H atoms of the 4-amino­pyridinium cations are essentially coplanar, with a maximum deviation of 0.055 (1) Å (in cation A), 0.022 (3) Å (for the major component in cation B) and 0.009 (3) Å (for the minor component in cation B). In the crystal, the sulfate O atoms link the 4-amino­pyridinium cations and water mol­ecules into a three-dimensional network via inter­molecular O—H⋯O, N—H⋯O and C—H⋯O hydrogen bonds. The crystal structure is further consolidated by N—H⋯O(water) and C—H⋯O(water) hydrogen bonds.
doi:10.1107/S1600536810030941
PMCID: PMC3007857  PMID: 21588615

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