Diaquabis(2-quinolinecarboxylato-N,O)manganese(II)

Syntheses, structures, and magnetic properties of three supramolecular isomeric Cu(ii) square grid networks: solvents effect on the ligand linkages

Three supramolecular isomeric Cu(ii) networks with different metal fragments and ligand conformations were obtained by the adjustment of solvent molecules.

catena-Poly[[diaqua-strontium]-bis-(μ-quinoline-3-carboxyl-ato)]

The title compound, [Sr(C(10)H(6)NO(2))(2)(H(2)O)(2)](n), contains an eight-coordinate Sr(II) ion displaying a distorted square-anti-prismatic geometry, two quinoline-3-carboxyl-ate ligands and two terminal water mol-ecules. The Sr(II) atom is surrounded by six carboxyl-ate O atoms from four separate quinoline-3-carboxyl-ate ligands and two O atoms from two coordinated water mol-ecules. The bridging carboxyl-ate O atoms [Sr-O = 2.498 (3) and 2.495 (3) Å] link Sr(II) atoms, forming a chain substructure extending along the c axis. The chains are linked by O-H⋯N and O-H⋯O hydrogen bonds, giving a three-dimensional framework structure.

trans-Bis(methanol-κO)bis-(quinoline-2-carboxyl-ato-κN,O)manganese(II)

The title compound, [Mn(C₁₀H₆NO₂)₂(CH₄O)₂], was obtained unintentionally as the product of an attempt to synthesize a polynuclear carboxyl­ate bridged manganese(III/IV) complex, using methanol to reduce the permanganate ion. The mol­ecule is centrosymmetric; the pairs of equivalent ligands coordinate trans to each other in a distorted octa­hedral geometry. Intra­molecular C—H⋯O bonds lying in the equatorial plane stabilize the mol­ecule. In the crystal, mol­ecules are linked by O—H⋯O and C—H⋯O hydrogen bonds, creating a three-dimensional supra­molecular structure. π–π and C—H⋯π inter­actions are also observed. The dihedral angle and centroid-to-centroid distance between the pyridine ring (A) and the benzene ring (Bⁱ) of a symmetrically related mol­ecule [symmetry code: (i) −1 − x, −y, −z] are 1.27 (11)° and 3.974 (2) Å, respectively. For the C—H⋯π inter­actions, the relevant distances and angles are: C⋯Cg[Aⁱⁱ] = 3.643 (2) Å, H⋯Cg[Aⁱⁱ] = 2.750 (2) Å and C—H⋯Cg[Aⁱⁱ] = 155 (1)° [symmetry code: (ii) x, −1 + y, z].