The crystal structures of the isotypic perrhenates Ca5Re2O12 and Sr5Re2O12

Preparation and Crystal Structure of Rare Earth Rhenates: the SeriesLn5Re2O12 withLn = Y, Gd-Lu, and the Praseodymium Rhenates Pr3ReO8, Pr3Re2O10, and Pr4Re2O11

“…In the course of our investigations of alkaline earth and rare earth rhenates and perrhenates we have already reported our results concerning the preparation and crystal structures of the perrhenates Ca 5 Re 2 O 12 and Sr 5 Re 2 O 12 [1], the perrhenate halides Sr 5 (ReO 5 ) 3 X (X = Cl, Br, I) and Ba 5 (ReO 5 ) 3 Cl [2], the reduced rhenate (VI, VII) Ca 11 Re 4 O 24 [3], the series of reduced rhenates(IV) Ln 2 ReO 5 (Ln = Sm, Eu, Gd), the series of rhenates Ln 3 Re 2 O 9 (Ln = Pr, Nd, Sm), where rhenium occurs in the two oxidation states +4 and +5, and the series Ln 4 Re 6 O 19 (Ln = La±Nd), where the rhenium atoms have the fractional oxidation number +4.33 [4].…”

Two Modifications of Hg5Re2O10

“…rein") as described previously [5]. M ercury(II) m etaperrhenate H g (R e 0 4)2 was obtained by neutralization of the perrhenic acid with HgO.…”

La7Ru3O18 and La4.87Ru2O12: Geometric Frustration in Two Closely Related Structures with Isolated RuO6 Octahedra

“…Both structures can be viewed as cation-de"cient versions of the rhombohedral Sr Re O structure type (2). Electron counting gives a formal valence of Ru> in La Ru O and Ru> in La Ru O , both of which are relatively high oxidation states for ternary oxides of ruthenium.…”