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Single crystals of Cs 2 K 2 [Pt 12 O 8 (SO 4 ) 12 ] (R3̄, Z = 3, a = 1198.9(3), c = 2768.9(9) pm, R all  = 0.1154) were obtained by the reaction of Cs 2 [Pt(NO 2 ) 4 ], K 2 [Pt(NO 2 ) 4 ] and conc. sulfuric acid at 400 °C in a sealed glass ampoule. The compound contains the cluster anion [Pt 12 O 8 (SO 4 ) 12 ] 4− . It consists of six Pt 2  6+  dumbbell shaped cations that are linked by eight oxide ions and twelve sulfate anions to form a distorted Pt 12  icosahedron. The arrangement of the cluster anions in the crystal structure provides two voids for the cations. The larger one is occupied by the Cs +  ions while the K +  ions reside in the smaller one. For the Cs +  ions the coordination number is 15 while the K +  ions have a coordination number of 13.

Cs 2 K 2 [Pt 12 O 8 (SO 4 ) 12 ]: A New Oxide-Sulfate with the Cluster Anion [Pt 12 O 8 (SO 4 ) 12 ] 4–