Barium trihydrogen tetrafluoride of the composition Ba(H 3F 4) 2: The first example of homoleptic HF metal environment
Single crystals of the composition Ba(H 3F 4) 2 were obtained from an anhydrous hydrogen fluoride (aHF) solution of BaF 2, in the presence of XeF 2 and excessive PF 5. The compound crystallizes in a hexagonal P 6¯2c space group with a=7.7756(12) Å, c=12.650(3) Å, V=662.4(2) Å and Z=4. The coordination sphere of barium atom consists of twelve fluorine atoms from HF molecules forming regular icosahedra. Metal and fluorine atoms form infinite three-dimensional network. HF molecules are bonded via F - anions to HF4- anions. The Ba(H 3F 4) 2 compound represents the first known example of homoleptic HF environment of the metal cation.