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ISSN: 2414-3146

January 2021 issue

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Cover illustration: Work in the area of synthesis of polynuclear manganese complexes and their magnetic properties led to the synthesis and crystallization of the compound di-μ-benzoato-di-μ-ethano­lato-tetra­kis­[μ3-5-(hy­droxy­meth­yl)-2-methyl-4-(oxidometh­yl)pyridin-1-ium-3-olato]tetra­kis­[μ3-5-(hy­droxy­meth­yl)-2-methyl-4-(oxidometh­yl)pyridin-3-olato]di-μ3-oxido-hepta­manganese(II,III) ethanol octa­solvate, [Mn7(C8H9NO3)4(C8H10NO3)4(C2H5O)2(C7H5O2)2O2]·8C2H5OH. The compound was synthesized by the reaction of Mn(C6H5COO)2 with pyridoxine (PNH2, C8H11NO3) followed by the addition of tetra­methyl­ammonium hydroxide (TMAOH). The core of this centrosymmetric complex is a cage-like structure consisting of six MnIII ions and one MnII ion bound together through Mn—O bonds. The compound crystallizes in hydrogen-bonded layers formed by O—H⋯N hydrogen bonds involving the aromatic amine group of the ligand PN2− with the neighboring O atoms from the PNH ligand. The crystal structure has large voids present in which highly disordered solvent mol­ecules (ethanol) sit. See: Saha, Padgett, LeMagueres, Moncur & Onajobi [IUCrData (2020). 5, x201578].

metal-organic compounds

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The title compound is formed by discrete anions and cations. The crystal packing is controlled by weak inter­molecular C—H⋯π inter­actions.

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The central NiII ion has an N2O2 square-planar coordination sphere defined by two N atoms and two O atoms of the tetra­dentate dianionic 4,4′-di­bromo-2,2′-[cyclo­hexane-1,2-diylbis(nitrilo­methanylyl­idene)]diphenolato ligand.

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The central MnII ion has a cis-N2Br4 octa­hedral coordination sphere defined by two N atoms of the bidentate 2,2′-bi­pyridine ligand and four bridging Br anions.

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The central PdII ion of the complex cation has an N3O square-planar coordination sphere defined by the three N atoms of the tridentate 2,2′:6′,2′′-terpyridine ligand and one O atom from the NO3 anion.

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The NiII ions both show a distorted N3Cl3 octa­hedral coordination environment defined by three N atoms of the tridentate 2,4,6-tri-2-pyridyl-1,3,5-triazine ligand, two bridging Cl ligands and a Cl anion.

organic compounds

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The title compound is an inter­mediate for the synthesis of iso­quinoline fluorine analogues. The structure presents a racemic mixture of enanti­omers. In the crystal, N—H⋯O hydrogen bonds between neighbouring mol­ecules form chains of mol­ecules along the a-axis direction.

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In the title compound, the mean planes of the indene ring and quinoxaline system are approximately parallel to one another, making a dihedral angle of 1.2 (5)°. The indeno­[1,2-b]quinoxaline ring is almost in the same plane.

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The title compound crystallizes in strands of enanti­omeric mol­ecules connected via O—H⋯N hydrogen bonds. There are only slight deviations from an ideal gauche conformation in the deca­methyl­ene chain, indicating just a little strain.

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In the title compound, two benzene rings bearing meth­oxy substituents are connected by central acetyl­pyrazoline ring: the dihedral angle between the benzene rings is 83.7 (1)°. In the crystal, pairwise C—H⋯O hydrogen bonds generate inversion dimers and additional weak C—H⋯O inter­actions link the dimers into chains propagating along the c-axis direction.

addenda and errata

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