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- W4248271192 abstract "A series of new nickel(II) perchlorate complexes containing an α-diimine(enR) and the anion of a β-dione (1,3-ketoenol or 1,3-ketoester, βH) was prepared and characterized. The composition and the overall structure of the new chelates depend on ligand concentration, on steric and electronic effects induced by substituents within the ligands and the ability of the perchlorate group to coordinate. The IR and electronic excitation spectra of [Ni(enR)2β]ClO4 and [Ni(enR)β(O2ClO2)] indicate, in conjunction with other physicochemical measurements, bidentate coordination of the ligands and replacement of the (O,O′) perchlorato group by basic solvents. The structure of the new chelates was further supported by an X-ray structure analysis of [Ni(ncup)2Etacet]ClO4, where ncup denotes neocuproine and Etacet the anion of the ethyl acetoacetate (orthorhombic, space group Pc21n, a = 14.087(5), b = 14.713(5) and c = 15.952(5) Å, Z = 4). The coordination sphere of nickel is a distorted octahedron, arised from the chromophore NiN4O2, in which the base is favored by three neocuproine nitrogens and one Etacet oxygen. The apical sites are occupied by the remaining oxygen and nitrogen atoms, one from Etacet and one from neocuproine respectively. Synthese und Charakterisierung von gemischten Nickel(II)-Chelaten mit β-Dionen und a-Diiminen. Kristall- und Molekularstruktur von [Ni(ncup)2Etacet]ClO4 Eine Reihe neuer Nickel(II)-perchlorat-Komplexe, die eine stickstoffhaltige Base(enR) und das Anion eines β-dions(βH) enthalten, wurde dargestellt und charakterisiert. Die Zusammensetzung und Struktur der neuen Chelate ist von der Liganden-Konzentration, von sterischen und elektronischen Effekten, welche durch die Substituenten der Liganden erzeugt werden und von der Fähigkeit des Perchlorat-Anions zu koordinieren, abhängig. Die IR- und Elektronenspektren von [Ni(enR)2β]ClO4 und [Ni(enR)β(O2ClO2)], zeigen zusammen mit anderen physikochemischen Eigenschaften zweizähnige Koordination der Liganden und Substitution der (O,O′)-Perchlorato-Gruppe durch basische Lösungsmittel. Die Struktur des [Ni(ncup)2Etacet]ClO4, (ncup = neocuproine und Etacet = Anion von Ethylacetoacetat) wurde röntgenographisch bestimmt (orthorhombisch, Raumgruppe Pc21n, a = 14.087(5), b = 14.713(5) und c = 15.952(5) Å, Z = 4). Die Koordinationssphäre des Nickelatoms ist ein verzerrtes Oktaeder, gebildet aus dem Chromophor NiN4O2, in welchem die äquatoriale Ebene von drei Neocuproine-Stickstoffatomen und einem Etacet-Sauerstoffatom gebildet wird. Die apikalen Plätze werden von den verbleibenden Sauerstoff- und Stickstoffatomen besetzt." @default.
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- W4248271192 date "1998-10-01" @default.
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- W4248271192 doi "https://doi.org/10.1002/(sici)1521-3749(199810)624:10<1699::aid-zaac1699>3.3.co;2-a" @default.
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