[KDy(Hptc)₃(H₃ptc)]_n·2n(Hbipy)·5n(H₂O), a layered coordination polymer containing DyO₆N₃ tri-capped trigonal prisms (H₃ptc = Pyridine 2,4,6-Tricarboxylic Acid, C₈H₅NO₆; Bipy = 2,2'-Bipyridine, C₁₀H₈N₂)

The synthesis, structure and properties of the bimetallic layered coordination polymer, [KDy(C₈H₃NO₆)₃(C₈H₅NO₆)]_n•2n(C₁₀H₉N₂)•5n(H₂O) = [KDy(Hptc)₃(H₃ptc)]_n•2n(Hbipy)•5n(H₂O), are described. The Dy³⁺ ion is coordinated by three O,N,O-tridentate doubly-deprotonated pyridine tri-carboxylate (Hptc) ligands to generate a fairly regular DyO₆N₃ tri-capped trigonal prism, with the N atoms acting as the caps. The potassium ion is coordinated by an O,N,O-tridentate H₃ptc molecule as well as monodentate and bidentate Hptc ligands to result in an irregular KNO₉ coordination geometry. The ligands bridge the metal-atom nodes into a bimetallic, layered, coordination polymer, which extends as corrugated layers in the (010) plane, with the mono-protonated bipyridine cations and water molecules occupying the inter-layer regions: Unlike related structures, there are no dysprosium-water bonds. Many O-H⋯O and N-H⋯O hydrogen bonds consolidate the structure. Characterization and bioactivity data are described. Crystal data: C₅₂H₄₂DyKN₈O₂₉,M_r = 1444.54, triclinic, P1 (No. 2), Z = 2, a = 9.188(2) Å, b = 15.7332(17) Å, c = 19.1664(19) Å, α = 92.797(6)°, β = 92.319(7)°, γ = 91.273(9)°, V = 2764.3(7) ų, R(F) = 0.029, wR(F²) = 0.084.