Abstract: | N2O4 dissolves in IF5 as NO+NO3–, as established by n.m.r spectroscopy, and in the solid state the solvate complex NO+NO3– · IF5 is formed. This contains a double chain of alternating NO+ cations and NO3– anions. (a = 483.4(2), b = 773.9(1), c = 932.6(3) pm, (α = 70.18(2)°, β = 80.90(3)°, (γ = 87.34(2)°, space group P1, Z = 2). |