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The hydrated title salt, [Cd 2 Cl 2 (C 10 H 8 N 2 ) 4 ](C 9 H 5 N 4 O) 2 ·0.81H 2 O, was obtained from the hydro-thermal reaction between 2,2'-bi-pyridine, cadmium(II) chloride and potassium 1,1,3,3-tetra-cyano-2-eth-oxy-propenide. The binuclear cation lies across a centre of inversion in the space group P 2 1 / c , with the other components in general positions. The cation has approximate, but non-crystallographic 2/ m symmetry and each of the Cd II atoms is a stereogenic centre, one having the Δ configuration and the other the Λ configuration. In the anion, one of the C(CN) 2 units is disordered over two sets of atomic sites having occupancies 0.75 (2) and 0.25 (2). The cations are linked by two independent C-H⋯Cl hydrogen bonds to form a sheet of R  2  2 (14) and R  4  2 (24) rings.

Crystal structure ofmeso-di-μ-chlorido-bis[bis(2,2′-bipyridine)cadmium] bis(1,1,3,3-tetracyano-2-ethoxypropenide) 0.81-hydrate