Finding
Characteristic for this structure are „isolated” trigonal bipyramidal groups of [TeO5] and „isolated” tetrahedral groups of [TeO4], so we prefere to name the new compound Rb6[TeO5][TeO4].
Paper
Ein Oxotellurat (VI) neuen Typs: Rb6[TeO5] [TeO4]†
Abstract
Neu dargestellt wurde erstmals Rb6Te2O9 durch Erhitzen inniger Gemenge der binaren Oxide in Form farbloser, unregelmasiger Einkristalle (geschlossene Ag-Bombchen in Supremaxampullen, 680°C, 45 d). Die Strukturaufklarung (Vierkreisdiffraktometerdaten; AgKα; 2083 I0(hkl); R = 9,5%, Rw = 6.6%) belegt die Raumgruppe C2/c. Aus Guinier-Simon-Aufnahmen folgt a = 1207,5(7), b = 1266,3(5), c = 1105,3(6) pm, β = 123,1(1)0, Z = 4. Strukturcharakteristisch sind „isolierte” trigonal-bipyramidale Gruppen [TeO5] und „isolierte” tetraedrische Gruppen [TeO4], was die Bezeichnung Rb6[TeO5][TeO4] richtiger erscheinen last. Der Madelunganteil der Gitterenergie, MAPLE, sowie Effektive Koordinationszahlen, ECoN, diese uber Mittlere Fiktive Ionenradien, MEFIR, werden berechnet und diskutiert. A New Type of Oxotellurates (VI): Rb6[TeO5] [TeO4] For the first time single crystals of Rb6Te2O9 was obtained by annealing intimate mixtures of the binary oxides (closed Ag-cylinder in supremax-glass ampoule, 680°C, 45 d). The structure elucidation (four-circle diffractometer, AgKα, 2083 I0(hkl); R = 9.5%, Rw = 6.6%) confirms the space group C2/c with a = 1207.5(7), b = 1266.3(5), c = 1105.3(6) pm, β = 123.1(1)0, Z = 4 (Guinier-Simon photographs). Characteristic for this structure are „isolated” trigonal bipyramidal groups of [TeO5] and „isolated” tetrahedral groups of [TeO4], so we prefere to name the new compound Rb6[TeO5][TeO4]. The Madelung Part of Lattice Energy, MAPLE, and Effective Coordination Numbers, ECoN, the latter derived from Mean Fictive Ionic Radii, MEFIR, are calculated and discussed.
Authors
Th. Wisser, R. Hoppe
Journal
Zeitschrift für anorganische und allgemeine Chemie