N,N,N,N′,N′,N′-Hexakis(2-hydroxyethyl)butane-1,4-diaminium bis(2-sulfanylidene-1,3-dithiole-4,5-dithiolato-κ2 S 4,S 5)zincate

In the asymmetric unit of the title compound, (C16H38N2O6)[Zn(C3S5)2], two independent cations lie across inversion centers. In one of the cations, the three symmetry-unique O—H groups are disordered over two sets of sites with refined occupancy ratios of 0.701 (9):0.299 (9), 0.671 (8):0.329 (8) and 0.566 (7):0.434 (7). In the anion, the ZnII ion is coordinated in a distorted tetrahedral environment by four S atoms of two chelating 1,3-dithiole-2-thione-4,5-dithiolato ligands. The dihedral angle between the mean planes [maximun deviations = 0.022 (3) and 0.0656 (6) Å] of the two ligands is 87.76 (3)°. An intamolecular O—H⋯O hydrogen bond occurs in the disordered cation. In the crystal, O—H⋯O and O—H⋯S hydrogen bonds link the components into a two-dimensional network parallel to (0-11).

Figs. 3 and 4. The asymmetric unit contains two independent cations which lie across inversion centers. In one of the cations the three symmetry unique O-H groups are disordered over two sets of sites with refined occupancy ratios of 0.701 (9):0.299 (9) for O4:O4′, 0.671 (8):0.329 (8) for O5:O5′ and 0.567 (7):0.434 (7) for O6:O6′. In the anion, the Zn II ion is coordinated in a distorted tetrahedral coordination environment by four S atoms of two chelating 1,3-dithiole-2thione-4,5-dithilato ligands. The dihedral angle between the mean planes of the two ligands (with maximun deviations of 0.022 (3) for C3 and 0.0656 (6) Å for S8) is 87.76 (3)°. In the crystal, O-H···O and O-H···S hydrogen bonds link the components of the structure into a two-dimensional network parallel to (011) (Fig. 4). Only the donor H atoms of the major components of disorder have been considered. The bis(tetra-N-butylammoniun) analogue of the title compound has been reported in the literature (Zhao et al., 2011).

Refinement
H atoms were placed in calculated positions with C-H = 0.97 Å and O-H = 0.82 Å and included in a riding-motion approximation with U iso (H) = 1.2U eq (C) or 1.5U eq (O). The C-O distances in the major and minor components of disorder were constrined to be similar.

Figure 1
The anion with displacement ellipsoids shown at the 30% level.  The ordered cation with displacement ellipsoids shown at the 30% level. Unlabled atoms are related by the symmetry operator (-x + 1, -y + 2, -z + 1).

Figure 3
The disordered cation with displacement ellipsoids shown at the 30% level. Unlabled atoms are related by the symmetry operator (-x + 1, -y + 1, -z). The minor components are shown with dashed lines.

Figure 4
Part of the crystal structure with donor-acceptor distances of hydrogen bonds shown as dashed lines.