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Synthese und Kristallstrukturen der spirocyclischen Polyselenido-Komplexe [Na-15-Krone-5]<sub>2</sub>[M(Se <sub>4</sub>)<sub>2</sub>] mit M = Zink, Cadmium und Quecksilber
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1988
Year
Materials ScienceInorganic ChemistrySelenium AtomsEngineeringCoordination ComplexOrganic ChemistryMain Group ChemistryChemistryDark Red CrystalsCrystallographyInorganic SynthesisMetal AcetatesInorganic Compound
Abstract The title compounds have been prepared by reactions of the metal acetates of zink, cadmium, and mercury with ethanolic solutions of sodium polyselenides in the presence of 15-crown-5. They form dark red crystals, which were characterized by their IR specta as well as by X-ray crystal structure determinations. All complexes [Na-15-crown-5] 2 [M(Se 4 ) 2 ] with M = Zn (1), Cd (2), Hg (3) crystallize isotypically in the space group C2/c with 4 formula units per unit cell. In the anions [M(Se 4 ) 2 ] 2- the metal atoms are coordinated tetrahedrally by four selenium atoms of two Se 4 2- units, thus forming a spiro-bicyclus. The complex cations [Na-15-crown-5] + have a Na---Se contact of approximately 299 pm with two selenium atoms of a MSe 4 group, allowing formulation of triple ion species.