Cyclohexane-based polyaminopolyalcohols (PAPAs) such as 1,3-diamino-1,2,3-trideoxy-cis-inositol (daci) have been prepared by hydrogenation of suitable aromatic precursors. The pentanuclear complex [Cu 5 (daci) 4 (H -2 daci) 2 ](SO 4 ) 3 ·18H 2 O (C3) revealed antiferromagnetic and ferromagnetic interactions between the Cu II centers with an S = 3/2 ground state.

The crystal structure of the title compound, C6H16N2O3 2+·2Cl−, has been reported previously by Palm [Acta Cryst. (1967 ▶), 22, 209–216] from Weisenberg camera data, with R1 = 10.5%, isotropic refinement of non-H atoms and H atoms not located. We remeasured a data set of the title compound and present a more precise structure determination. The asymmetric unit contains two unique 1,3-diammonio-1,2,3-tride­oxy-cis-inositol cations and four Cl− counter-ions. The cyclo­hexane rings of both inositol cations adopt chair conformations with two axial hy­droxy groups. An extended network of hydrogen bonds is formed. The four chloride counter ions are hydrogen bonded to the hydroxy and ammonium groups of the cations by N—H⋯Cl and O—H⋯Cl interactions. The cations are aligned into wavy layers by cation⋯cation interactions of the form N—H⋯O(ax), N—H⋯O(eq) and O(ax)—H⋯O(eq). Intramolecular hydrogen bonding between the axial hydroxy groups is, however, not observed.

In the crystal structure of the title compound, C6H16N2O3 2+·SO4 2−, each cation forms three O—H⋯O and five N—H⋯O hydrogen bonds to six neighbouring sulfate anions. In addition, interlinking of the cations by N—H⋯O interactions is also observed. The cyclo­hexane ring adopts a chair conformation with two axial hy­droxy groups. Although the separation of 2.928 Å is almost ideal for a hydrogen bond, intra­molecular hydrogen bonding between these two hy­droxy groups is not observed.

In the title molecule, C6H4N2O7, the two nitro groups are tilted with respect to the aromatic ring by 11.2 (1) and 10.9 (1)°. All three hydroxy groups are involved in the formation of bifurcated intra- and intermolecular O—H...O hydrogen bonds. The crystal packing exhibits short O...O distances of 2.823 (2) Å between two O atoms of the nitro groups

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