Einkristallzüchtung und Röntgenstrukturanalyse der Fluoridcarbonate K₃CO₃F und Rb₃CO₃F / Crystal Growth and X-Ray Structure Determination of the Fluoride Carbonates K₃CO₃F and Rb₃CO₃F

Abstract

E in k r ista llz ü c h tu n g und R ö n tg en stru k tu ra n a ly se der F lu orid carb on ate K 3 C O 3 F und R b 3 C 0 3F

Natural and Synthetic Fluoride Carbonates

“…Finally, the synthesis of one fluoride carbonate series, A 2 A′-(CO 3 )F (A, A′ ) K, Rb, Cs), was achieved by solid-state synthesis. 12,13 Since then, numerous fluoride carbonates have been crystallized in subcritical and supercritical hydrothermal conditions, while only one phase, KCa(CO 3 )F, was synthesized by solid-state reaction. 14,15 Several new structural rare earth families, together with the first 3d transition metal compounds, have been substantiated; 16,17 the results of these investigations are reported in Table 2.…”

“…A lower density of carbonate groups is also found in alkaline fluoride carbonates A 3 (CO 3 )F (A ) K, Rb, or Tl). 12,13,59 Two out of three positions of a dense arrangement are replaced by one fluoride anion in B ( 2 / 3 , 1 / 3 ) and by three cations centered around C ( 1 / 3 , 2 / 3 ) (Figure 11).…”

“…Later, a crystal of Pb 2 (CO 3 )F 2 was obtained by chance by B. Aurivillius from a hydrothermal experiment at 180 °C. Finally, the synthesis of one fluoride carbonate series, A 2 A‘(CO 3 )F (A, A‘ = K, Rb, Cs), was achieved by solid-state synthesis. , …”

High-Pressure Synthesis and Structure Determination of K6(SeO4)(SeO5), the First Potassium Orthoselenate(VI)

“…However, even upon application of elevated hydrostatic pressure during synthesis, which would favor the formation of a higher coordination, all of our attempts to synthesize the respective orthosalts have failed, so far. However, it has been possible, on the other hand, to attach a fluoride to carbonate, producing CO 3 F - , which is isoelectronic to the orthocarbonate anion . In their oxoanions, the nonmetal elements of the third and fourth period prefer a tetrahedral coordination, which is thermodynamically as well as kinetically rather stable.…”