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The KM(AsF 6 ) 3  (M 2+  = Mg, Co, Mn, Zn) and KCu(SbF 6 ) 3  compounds crystallize isotypically to previously known KNi(AsF 6 ) 3 . The main features of the structure of these compounds are rings of MF 6  octahedra sharing apexes with AsF 6  octahedra connected into infinite tri-dimensional frameworks. In this arrangement cavities are formed where K +  cations are placed. Single crystals of CoSr 5 (AsF 6 ) 12 ·8HF were obtained as one of the products after the crystallization of 3KF/CoF 2 /SrF 2  mixture in the presence of AsF 5  in anhydrous HF. The CoSr 5 (AsF 6 ) 12 ·8HF is monoclinic,  C/2c  (No.15), with  a  = 26.773(5) Å,  b  = 10.087(2) Å,  c  = 21.141(5) Å,  β  = 93.296(13) °,  V  = 5699.9(19) Å 3  at 200 K, and  Z  = 4. There are three crystallographically non-equivalent Sr 2+  cations in the crystal structure of CoSr 5 (AsF 6 ) 12 ·8HF. The Sr1 is coordinated by ten fluorine atoms from eight different [AsF 6 ] -  anions, meanwhile Sr2 and Sr3 are bound to nine fluorine atoms provided by one HF and eight AsF 6  units or by two HF and six AsF 6  units, respectively. The Co 2+  is coordinated distorted-octahedrally by six fluorine atoms from two HF molecules and four different AsF 6  units. All those moieties in the crystal strucutre of [Co(HF) 2 ]Sr[Sr(HF)] 2 [Sr(HF) 2 ] 2 [AsF 6 ] 12  are connected into tridimensional framework. The CoSr 5 (AsF 6 ) 12 ·8HF is a unique example of compound where HF molecules are directly bound  via  fluorine atoms to two different metal centres.

Crystal structures of KM(AsF 6 ) 3 (M 2+ = Mg, Co, Mn, Zn), KCu(SbF 6 ) 3 and [Co(HF) 2 ]Sr[Sr(HF)] 2 [Sr(HF) 2 ] 2 [AsF 6 ] 12