Bis[N-(2-hydroxyethyl)-N-propyldithiocarbamato-κ2 S,S′]bis(4-{[(pyridin-4-ylmethylidene)hydrazinylidene]methyl}pyridine-κN 1)cadmium

The complete molecule of the title compound, [Cd(C6H12NOS2)2(C12H10N4)2], is generated by crystallographic inversion symmetry. The distorted octahedral trans-N2S4 donor set for the Cd2+ ion is defined by two symmetrically S,S′-chelating dithiocarbamate anions and two pyridine N atoms derived from two monodentate 4-pyridinealdazine (or 4-{[(pyridin-4-ylmethylidene)hydrazinylidene}methyl]pyridine) molecules [dihedral angle between the aromatic rings = 17.33 (8)°]. In the crystal, molecules are connected into a supramolecular chain via O—H⋯N hydrogen bonds involving the 4-pyridinealdazine N atoms not involved in coordination to cadmium. Weak C—H⋯O and C—H⋯N links consolidate the packing.

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HB5795).

Comment
Interest in the title compound, (I), relates to controlling supramolecular aggregation patterns in the zinc-triad 1,1-thiolates (Tiekink, 2003;Chen et al., 2006). With functionalized dithiocarbamate ligands carrying hydrogen bonding potential, smaller aggregates can be linked into 2-D and 3-D architectures (Benson et al., 2007;Song & Tiekink, 2009). In (I), the cadmium atom is located on a centre of inversion and is chelated by symmetrically coordinating dithiocarbamate ligands, Table 1 and Fig. 1. The octahedral N 2 S 4 donor set is completed by two pyridine-N atoms derived from two monodentate 4-pyridinealdazine ligands.
The monomeric molecules are connected into a supramolecular chain via O-H···N hydrogen bonds, Table 2, that lead to the formation of 40-membered [CdSCNC 2 OH···NC 4 N 2 C 4 N] 2 synthons, Fig. 2. These chains are linked into layers via C-H···O interactions, Table 1, which that stack along [1 0 1]; consolidation of these layers into a 3-D array is afforded by C-H···N azo contacts, Table 2

Experimental
Compound (I) was prepared following the standard literature procedure (Song & Tiekink, 2009)    Crystal data [Cd(C 6

Special details
Geometry. All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell s.u.'s are taken into account individually in the estimation of s.u.'s in distances, angles and torsion angles; correlations between s.u.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell s.u.'s is used for estimating s.u.'s involving l.s. planes.
Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > 2σ(F 2 ) is used only for calculating Rfactors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.