μ-Adipato-κO:O-bis-{[2,6-bis-(1H-benzimidazol-2-yl-κN)pyridine-κN](nitrato-κO)lead(II)}

The dinuclear title compound, [Pb₂(C₆H₈O₄)(NO₃)₂(C₁₉H₁₃N₅)₂], lies with the mid-point of the butyl chain of the bridging adipate unit on a center of inversion. The Pb^II ion is covalently bonded to the nitrate anion and is bonded to a carboxyl­ate group of the adipate unit by another covalent bond. The N-heterocycle functions in a chelating tridentate mode. The metal atom exists in a Ψ-octa­hedral coordination environment. When weaker Pb⋯O inter­actions are also considered, the geometry is a Ψ-tricapped trigonal prism in which the lone-pair electrons occupy one face of the trigonal prism. Adjacent mol­ecules are linked into a layer structure by N—H⋯O hydrogen bonds.

Tetra-aqua-bis[3-(4-pyrid-yl)benzoato-κN]nickel(II)

The Ni(II) atom in the title compound, [Ni(C(12)H(8)NO(2))(2)(H(2)O)(4)], exists in an all-trans octa-hedral coordination environment. The 3-(4-pyrid-yl)benzoate ligand binds to Ni atom through the pyridyl N atom; the pyridine and benzene rings are oriented at a dihedral angle of 26.27 (10)°. Adjacent complexes are linked by O-H⋯O hydrogen bonds, forming a three-dimensional network. The metal atom lies on a special position of 2 site symmetry in the crystal structure.

7H-Chromeno[3,2-h]quinolin-7-one methanol monosolvate

The four-ring system in the title compound, C(16)H(9)NO(2)·CH(3)OH, is planar (r.m.s deviation = 0.03 Å); the methanol solvent mol-ecule forms a hydrogen bond to the quinoline N atom.

Bis(2-hydroxy-imino-methyl-6-methoxy-phenolato-κO,N)nickel(II)

The Ni atom in the title compound, [Ni(C₈H₈NO₃)₂], lies on a center of inversion in a square-planar coordination enviroment. The hydroxyl group of one anion forms a short hydrogen bond to the metal-coordinated O atom of the other anion.

3D Homometallic Carboxylate Ferrimagnet Constructed from a Manganese(II) Succinate Carboxylate Layer Motif Pillared by Isonicotinate Spacers

A manganese succinate having a layer structure in which the layers are pillared by the isonicotinate spacers in a 3D architecture exhibits long-range ferrimagnetic order below 5.0 K, with the ferrimagnetism arising, for topological reasons, from the nature of the carboxylate binding modes. The compound is the first structurally authenticated example of a 3D ferrimagnet, featuring a homometallic topological ferrimagnetic sheet among metal carboxylates.