New representative in the sodalite structure type with extraframework anions [AlF6]3−

The crystal structure of new synthetic aluminosilicate |Na7.38(AlF6)0.70(H2O)4.88|[(Si6.74Al5.26)O24]-SOD, which was obtained by hydrothermal synthesis (T = 650° C, P = 2 Kbar) in the Si-Al-Na-F-H2O system, has been found by X-ray diffraction (Xcalibur-S-CCD diffractometer, 2θmax = 64.99°, R = 0.037 for 440 reflections): a = 9.0461(1) Å, sp. gr. P 4 3m, Z = 1, and ρcalcd = 2.370 g/cm3. The disordered Si,Al-tetrahedral framework (the structural basis of the new compound) is topologically identical to the framework of mineral sodalite. Na+ cations, [AlF6]3− anions, and H2O molecules occupy framework voids. The form of fluorine incorporation into the sodalite crystal structure (as octahedral aluminofluoride complexes) has been reliably established for the first time.