Cover illustration: The molecular structure of the cation in -acetato-acetonitriletris(-N,N'-diphenylformamidinato)diruthenium tetrafluoroborate dichloromethane hemisolvate, with displacement ellipsoids shown at the 35% probability level. Only one orientation for the disordered phenyl group and the axially coordinated acetonitrile molecule is shown. H atoms have been omitted for clarity. See Angaridis, Cotton, Murillo & Wang [Acta Cryst. (2005), C61, m71-m73].
The structures of Rb2YbTi(PO4)3 and Rb2Yb0.32Ti1.68(PO4)3 have been determined at both 293 and 150 K. Both compounds belong to the langbeinite structure type, with mixed Yb/Ti populations in the two crystallographically independent octahedral sites (of symmetry 3). Ytterbium favours one of these sites, where about two-thirds of the Yb atoms are found. The O-atom displacement parameters are large in both compounds at both temperatures.
The lithium chlorite, LiClO2, and potassium chlorite, KClO2, structures consist of layers of alkali cations bridged by chlorite anions. The Li+ cations are tetrahedrally coordinated by oxygen. The coordination environment of the K+ cations involve eight O atoms, which form a distorted cube.
The title compound was obtained by the reaction of Gd2O3 and B2O3 under high-pressure/high-temperature conditions of 3 GPa and 1223 K using a Walker-type multi-anvil assembly. The crystal structure has been determined by single-crystal X-ray diffraction.