Xenon fluoride nitrate
Xenon fluoride nitrate, also known as fluoroxenonium nitrate, is the chemical compound with formula FXeONO. Synthesis. This compound is formed via the reaction: Purification of FXeONO can then take place by dissolving in SOClF, which leaves the nitronium arsenic hexafluoride behind as a solid. An alternate low yield method to make FXeONO is to dissolve xenon difluoride in liquid dinitrogen tetroxide at 0 °C. This method is inefficient as not much nitrate ion exists in the liquid and the xenon fluoride nitrate decomposes. Another method claimed to make this substance is: Properties. FXeONO is a white  crystalline material. The space group of the crystals is P2/c, which is monoclinic. The unit cell contains four molecules with a total volume of 386.6 Å. The unit cell dimensions are a = 4.6663 Å, b = 8.799 Å c = 9.415 Å, with non-perpendicular angle β = 90.325°. With a molecular weight of 212.3, the crystal has density 3.648. (These measurements at -173 °C.) The bond lengths in the molecule are 1.992 Å for Xe–F, 2.126 Å for Xe–O, 1.36 Å for O–NO, 1.199 for N–O and 1.224 Å for N –O. The bond angles are 177.6° for F–Xe–O, 114.7° for Xe-O-N, 114.5° for (Xe)O–N–O, 118.4° for (Xe)O–N–O and 127.1° for O–N–O. The bond lengths and angles on the xenon atom are similar to that in FXeOSOF and FXeOTeF, indicating a polar oxygen bond. The Xe–O–N angle is larger than those in halogen nitrates, which indicates a lower bond density for the Xe–O bond. The N–O bond length is longer than the N–O bond length, opposite to other halogen nitrates. FXeONO  is not particularly stable and slowly breaks down at -78 °C, yielding XeF·NO. This happens on a timescale of several days. At 0 °C, FXeONO has a half life of seven hours, decomposing to XeF.