The reactions of NiSO4·6H2O or Mn(CH3COO)2·4H2O with the planar ligands of indane-1,2,3-trione trioxime (H3Itto) or indane-1,2,3-trione-1,2-dioxime (H2Itdo) gave two planar pentanuclear clusters [Et3NH]2[Ni5(HItto)4(MeOH)2(H2O)6(SO4)2]·2H2O (1) and [Ni5(HItdo)2(Itdo)2(DMF)4(MeOH)(H2O)(SO4)2]·CH3OH·6H2O (2), one planar trinuclear cluster, [MnIII 3(μ3-O)(Itdo)3(CH3COO)(DMF)2(H2O)2]·H2O (3), and one planar platelike trinuclear cluster, [MnIII 3(μ3-O)(Itdo)3(CH3COO)(DMF)2(MeOH)(H2O)]·H2O (4). Five Ni(II) ions of 1 and 2 are consolidated by four indane-1,2,3-trione trioxime ligands and four indane-1,2,3-trione-1,2-dioxime ligands, respectively, to form square topological planar pentanuclear clusters with five Ni(II) ions and all atoms of the four oxime ligands nearly in one plane. However, 1 and 2 show some differences in the bridging of the central metal ion with the metal ions on the square corners. Both 3 and 4 feature a planar isosceles triangular [Mn3(μ3-O)]7+ core. Each edge of the triangular [Mn3(μ3-O)]7+ core in 3 and 4 is bridged by a μ2,η3-bridging indane-1,2,3-trione-1,2-dioxime ligand to construct a planar skeleton for 3 with the central oxygen atom, three Mn(III) ions, and all atoms of the indane-1,2,3-trione-1,2-dioxime ligands nearly in one plane, and a planar platelike skeleton for 4 with the ligand planes deviating from the triangular metal plane. Magnetic studies of 1−4 reveal the presence of antiferromagnetic interactions between the metal ions in 1−4.

In the title compound, [Dy(C5H2.5N2O4)2(C12H8N2)2]·2H2O, the DyIII ion is located on a twofold rotation axis and is coordinated in a square-anti­prismatic geometry by two chelating 1,10-phenanthroline mol­ecules as well as two 4-oxido-2-oxo-2,3-di­hydro­pyrimidin-1-ium-5-carboxyl­ato(1.5−) anions. N—H⋯O and O—H⋯O hydrogen bonds help to stabilize the crystal structure. The H atom involved in an N—H⋯N hydrogen bond is disordered around a twofold rotation axis.

In the structure of the title compound, C8H7N5O, the pyridine ring and the imidazole ring are nearly coplanar, making a dihedral angle of 2.97 (15)°. An intra­molecular N—H⋯O hydrogen bond occurs. In the crystal mol­ecules are connected by inter­molecular hydrogen bonds and π–π stacking inter­actions between neighboring imidazole rings [centroid–centroid distance = 3.5842 (5) Å and off-set angle = 21.77°], leading to the formation of a two-dimensional supra­molecular sheet.

The title compound, C10H10N2 2+·C10H8O4 2−, has inversion centres located at the geometric centres of the 1,4-phenyl­enediacetate anion and 4,4′-bipyridinium cation. The anions and cations are connected by N—H⋯O hydrogen bonds, forming one-dimensional supra­molecular chains, which inter­act with each other via π–π inter­actions [centroid–centroid distance = 3.938 (2) Å], building a two-dimensional supra­molecular sheet.

Summary Herein, a series of lithium‐sodium hybrid ion Na3−xLixV2(PO4)3/C (x = 2.5, 2.0, 1.5, 1.0, 0.5) as cathode materials are prepared by sol‐gel method. The lithium storage properties of Na3−xLixV2(PO4)3/C reveal that the lithium sodium ratio has a strong influence on material structure and the electrochemical properties. The multiple voltage platforms are observed at charge and discharge curve for the Na0.5Li2.5V2(PO4)3 material, as it contains rhombohedral and monoclinic Li3V2(PO4)3 phases, whereas a single voltage platform can be observed when x is less than 2, which are mixtures of Na3V2(PO4)3 with rhombohedral structure and Li3V2(PO4)3 with rhombohedral structure. Notably, NaLi2V2(PO4)3/C prepared by the calcination at 700°C for 8 hours contains a single rhombohedral phase. And when the charging and discharging voltage at the range 2.5 to 4.5 V and current density at 0.5C, NaLi2V2(PO4)3/C and Na2.5Li0.5V2(PO4)3/C are prepared by the pre‐calcination at 400°C for 4 hours and subsequent calcination at 750°C for 8 hours exhibit high first‐cycle specific discharge capacities of 124.8 and 130.0 mAh·g−1. The capacities are 118.4 and 115.1 mAh·g−1 after 50 cycles, indicating excellent capacity retention.