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The isostructural title compounds have been characterized by X-ray powder and single crystal diffraction: R 3̅ c; Z = 6; a = 741.81(4), c = 1639.18(9) pm; 389 diffractometer data, R = 0.04, Rw = 0.03 (K3CO3F); α = 776.1(3), c = 1741.2(9) pm; 235 diffractometer data, R = 0.07, R = 0.06 (Rb3CO3F). Both compounds are carbonate fluorides with isolated CO3 2- and F- anions.
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Arlt et al. (1990) studied this question.
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