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NaF (1 M, 120 ml) has been added to a solution of Al13 (0.03 M, 2 ml) in a molar ratio [F-] : [Al13 7+] of 2 : 1 and further crystallised by addition of Na2SO4 (0.5 M, 10 ml). An XRD structure determination on a single crystal confirms that the compound is fully isostructural to Na[Al13O4(
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