ChemInform Abstract: Coordination Trends in Alkali Metal Crown Ether Uranyl Halide Complexes: The Series [A(Crown)]₂[UO₂X₄] Where A: Li, Na, K and X: Cl, Br.

Abstract

structure structure (solids and liquids) D 2000 41 -002 Coordination Trends in Alkali Metal Crown Ether Uranyl Halide Complexes: The Series [A(Crown)] 2 [UO 2 X 4 ] Where A: Li, Na, K and X: Cl, Br. -Title compounds (III), (V), and (VII) are characterized by powder and single crystal XRD and by IR and Raman spectroscopy. (III) and (Va) crystallize in the monoclinic space group P2 1 /n with Z = 2, (Vb) in the orthorhombic space group Pccn (Z = 4), (VIIa) in the orthorhombic space group Fmm2 (4), and (VIIb) is also orthorhombic (Cmca, 4). The coordination of the [UO 2 X 4 ] 2− ions to two [M + (crown)] cations each occurs via four halides in (III), via two halides for one orientation of (Va), via two halides and two uranyl oxygens in (Va) and (Vb), and via only the two uranyl oxygens in (VIIa,b). The structural trends are discussed within the context of classical principles of hard/soft acid-base theory. -(DANIS, JANET A.; LIN, MAVIS R.; SCOTT, BRIAN L.; EICHHORN, BRYAN W.; RUNDE, WOLFGANG H.; Inorg.