Bis(di­cyclo­hexyl­ammonium) sulfate dihydrate

In the title dihydrate salt, 2C₁₂H₂₄N⁺·SO₄²⁻·2H₂O, the cation possesses twofold rotational symmetry, with the N atom situated on the twofold axis. The sulfate anion has fourfold roto-inversion symmetry, with the S atom located on the -4 axis. In the crystal, the components are linked via ammonium–sulfate N—H...O and water–sulfate O—H...O hydrogen bonds, forming a three-dimensional network.

1,5-Bis(2-hy­droxy-3-meth­oxy­benzyl­idene)carbonohydrazide methanol 0.47-solvate

In the title compound, C₁₇H₁₈N₄O₅·0.47CH₃OH, the virtually planar (r.m.s. deviation = 0.128 Å) carbonohydrazide mol­ecule is located on a twofold axis and conformation of its C=N bonds is E. There are short intra­molecular O—H...N hydrogen bonds between the hy­droxy groups and hydrazide N atoms. In the crystal, bifurcated N—H...(O,O) hydrogen bonds assemble the carbonohydrazide mol­ecules into a three-dimensional network. There are C₂ symmetric voids in this network, 47% of which are occupied by disordered methanol mol­ecules.