Antimony(III) fluoride complexes with compositions (NH4)3Sb4F15(I) and Cs3Sb4F15(II) are structurally characterized. Crystals Iare triclinic: a= 8.317(3) Å, b= 10.419(6) Å, c= 10.826(3) Å, α = 63.71(4)°, β = 73.24(3)°, γ = 77.42(5)°, Z= 2, ρcalcd= 3.42 g/cm3, ρexp= 3.45 g/cm3, space group P\documentclass[12pt]{minimal}
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$$\overline {\text{1}} $$
\end{document}, R= 0.051; crystals IIare monoclinic: a= 8.079(2) Å, b= 29.116(8) Å, c= 8.162(2) Å, β = 117.08(2)°, Z= 4, ρcalcd= 4.549 g/cm3, ρexp= 4.50 g/cm3, space group P21/c, R= 0.036. Structure Iis composed of SbF4E and SbF5E polyhedra combined into tetranuclear chains; crystals IIconsist of SbF4E polyhedra, two of which form a dimer Sb2F7E2, while the other two are isolated (E is the antimony lone electron pair).
