Crystal structure determination of Pb2F2(HF)(SbF6)2, PbFSbF6 and Ba(HF)(AF6)2: (A = As, Sb)

•Ribbon-like [Pb4F4]4+ units in the structure of Pb2F2(HF)(SbF6)2.•Similar [Pb–F]nn+ ribbon-like polymers are observed in the crystal structure of PbFSbF6.•HF is coordinated to metal centre in Ba(HF)(AF6)2 (A = As, Sb).

The PbFSbF6 and three compounds with hydrogen fluoride (HF) bonded directly to the metal centre (Pb2F2(HF)(SbF6)2 and Ba(HF)(AF6)2: (A = As, Sb) were structurally characterized. Pb2F2(HF)(SbF6)2 crystallizes in the orthorhombic space group Pbca with a = 13.0470(3) Å, b = 10.3366(3) Å, c = 18.2427(5) Å, V = 2460.24(11) Å3 at 200 K, Z = 8. The main feature of its crystal structure is formation of the ribbon-like [Pb4F4]4+ units, which are further connected by SbF6− units into three dimensional framework. Similar [Pb–F]nn+ ribbon-like polymers are observed in the crystal structure of PbFSbF6. The later crystallizes in the triclinic space group P1¯ with a = 4.7439(5) Å, b = 7.4001(6) Å, c = 7.6940(8) Å, α = 106.218(8)°, β = 102.220(9)°, γ = 90.479(7)°, V = 252.82(5) Å3 at 150 K, Z = 2. Single crystals of Ba(HF)(AF6)2 (A = Sb, As) were prepared and structurally characterized. These two compounds crystallize in the orthorhombic space group Pbcn, Z = 8 with following cell dimensions; A = Sb: a = 11.0231(3) Å, b = 16.0557(4) Å, c = 11.7044(4) Å, V = 2071.49(10) Å3; A = As: a = 10.7149(9) Å, b = 15.7256(15) Å, c = 11.2027(9) Å, V = 1887.6(3) Å3 (both at 200 K), Z = 8.

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