Crystal Structure of Bis(μ-4-methylpiperidine-1-carbodithioato-1:2κ³S,S′:S′;2:1κ³S,S′:S′)bis[(4-methylpiperidine-1-carbodithioato-k²S,S′)cadmium(II)]

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The structure of the title compound features both bridging and chelating dithiocarbamate ligands, so that a tetragonal pyramidal S₅ coordination geometry results. Each of the chelating ligands is bidentately coordinated to a cadmium atom, and forms a planar four-membered chelate ring [CdS₂C]; However, a pair of tridentate bridging ligands combine two neigbouring cadmium atoms, forming extended eight-membered tricyclic moieties [Cd₂S₄C₂], whose geometry can be approximated by a ‘chair’ conformation. The compound crystallizes in the triclinic space group P1 with the following unit-cell parameters: a = 8.5286(6), b = 11.4221(6), c = 11.4561(6)Å, α = 112.632(2), β = 97.216(2), γ = 106.241(2)°, Z = 1. The crystal structure was solved by direct methods using single-crystal X-ray diffraction data collected at room temperature, and refined by full-matrix least-squares procedures to a final R-value of 0.0297 for 5115 observed reflections. Both of the piperidine rings exhibit a chair conformation. The structure has an intermolecular hydrogen bond of the type C-H…S, which helps to stabilize the crystal structure.