Abstract
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–HLO and N–HLO hydrogen bonds consolidate the structure. Characterization and bioactivity data are described. Crystal data: C52H42DyKN8O29, Mr = 1444.54, triclinic, (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) Å3, R(F) = 0.029, wR(F2) = 0.084.
Highlights
Coordination polymers, in which bridging ligands connect metal atoms into an extended network [1], have been intensively studied for the past 100 years
One or more water molecules are directly coordinated to the dysprosium ion
The dysprosium ion in 1 is coordinated by the three O,N,O-tridentate C8H3NO6 dianions to generate a near-regular tri-capped trigonal prismatic DyO6N3 coordination geometry with the N atoms serving as the caps protruding through the prismatic side-faces (Figure 2)
Summary
Coordination polymers, in which bridging ligands connect metal atoms into an extended network [1], have been intensively studied for the past 100 years. This area of chemistry is so vast that a journal solely devoted to reviewing the field—Coordination Chemistry Reviews—publishes some 3000 pages per year. In all these compounds, the tri-anionic ptc ligand forms an. The crystal structures of [K(VO2)(C8H3NO6)]n·nH2O [6], [KCaEr(C8H2NO6)2(H2O)]n [7] and [KBa(C8H2NO6)(H2O)2]n [7] have been reported but there are no mixed-metal K/Dy/ptc coordination polymers yet known
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