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ISSN: 2414-3146

February 2021 issue

Early view articles

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metal-organic compounds

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The central NiII ion has an N4Cl2 octa­hedral coordination sphere defined by three N atoms of the tridentate 2,3,5,6-tetra-2-pyridyl­pyrazine ligand, one N atom of the pyridine ligand and two Cl anions.

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In the title complex, the central PdII ion has an N4 square-planar coordination geometry defined by the four N atoms of two bidentate 2,3-di-2-pyridyl­pyrazine ligands.

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In the title bimetallic complex, two Cd2+ metal ions are linked by a pair of Cl ions and their coordinations completed by another Cl ion and three N atoms.

organic compounds

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In the title compound, the dihedral angle between the aromatic rings is 9.60 (7)° and the chain linking the rings has an anti conformation with a torsion angle of −178.28 (12)°. In the crystal, the components are linked by O—H⋯O and O—H⋯N hydrogen bonds, generating (010) sheets.

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The structure of the natural product bufotenidine is reported as its iodide salt.

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The title compound has a polarized π-system due to resonance between N—C(H)=C(H)—B and ionic N+=C(H)—C(H)=B canonical structures. In comparison with the previously reported E-isomer, the reduced planarity of Z-isomer results in a decrease of the contribution of the N+=C(H)—C(H)=B canonical structure.

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The crystal structure of the title penta­cyclo-substituted naphtho­quinone, C13H10O2 is described.
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