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- W2324759805 abstract "Abstract The two new oxoferrates(III) Cs 6 [Fe 2 O 6 ] and Rb 4 [Fe 2 O 5 ] were synthesized at temperatures of 500 and 600 °C via reaction of Fe 2 O 3 with the elemental alkali metals (A) and their hyperoxides AO 2 in the form of dark-red crystals. Their crystal structures have both been determined by single crystal X-ray diffraction. The structure of Cs 6 [Fe 2 O 6 ] (monoclinic, P 2 1 / c , a = 724.6(2), b = 1212.1(5), c = 767.6(3) pm, β = 105.03(4)°, Z = 2, R 1 = 0.0272, K 6 [Mn 2 O 6 ] structure type) contains isolated bi nuclear anions [O 2 FeO 2 FeO 2 ] 6- composed of two edge sharing FeO 4 tetrahedra, which are also known from the potassium and rubidium compounds A 6 [Fe 2 O 6 ] that crystallize in the klassengleiche super group C 2/ m . Comparable building blocks are connected via common O vertices to form chains 1 ∞ [O 1/2 OFeO 2 FeOO 1/2 ] 4– in the rubidium ferrate(III) Rb 4 [Fe 2 O 5 ] (monoclinic, C 2/ c , a = 711.43(14), b = 1750.0(5), c = 725.3(2) pm, β = 104.72(2)°, Z = 4, R 1 = 0.0611). As a consequence of the edge sharing of FeO 4 tetrahedra, both compounds show short Fe—Fe distances of 273.3(2) pm in Cs 6 [Fe 2 O 6 ] and 265.6(3) pm in Rb 4 [Fe 2 O 5 ] respectively. Based on similarities in the packing of the (Fe III /A I ) cations, a structural relationship between the two compounds can be derived. The influence of the different counterions on the structure of the oxoferrate units in the phases of general composition A 6 [Fe 2 O 6 ] and A 4 [Fe 2 O 5 ] is discussed." @default.
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- W2324759805 date "2005-03-01" @default.
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- W2324759805 title "Cs<sub>6</sub>[Fe<sub>2</sub>O<sub>6</sub>] and Rb<sub>4</sub>[Fe<sub>2</sub>O<sub>5</sub>]: New oxoferrates(III) with edge sharing FeO<sub>4</sub> tetrahedra" @default.
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