catena-Poly­[[di­aqua(1,4,7,10,13,16-hexaoxa­cyclo­octa­decane)­barium(II)]-μ-cyano-[di­cyano­platinum(II)]-μ-cyano]

The title compound, [BaPt(CN)₄(C₁₂H₂₄O₆)(H₂O)₂], contains a polymeric chain of alternating complexes of Ba²⁺ and Pt²⁺. A ten-coordinate Ba²⁺ complex results from coordination of the metal by 18-crown-6 and two water mol­ecules, and N-atom coordination by a cyano group of [Pt(CN)₄]²⁻ and by a second cis-related cyano group of a second [Pt(CN)₄]²⁻ generated by a crystallographic b-glide. Crosslinking via hydrogen bonds involving the remaining two cyano N atoms completes the crystal structure in the a and c directions.