CRYSTAL-STRUCTURE OF RUBIDIUM FLUOROXYSULFATE - CHARACTERIZATION OF THE FLUOROXYSULFATE ANION

The rubidium salt of the recently identified fluoroxysulfate anion, FOSO3-, has been characterized by single-crystal X-ray diffraction. RbF0S03 crystallizes in the centrosymmetric triclinic space group, Pi, with unit cell constants a = 5.503(2) Å, b = 5.623 (1) Å, c = 7.603 (3) Å, α = 100.64(2)°, β= 106.72 (2)°, γ =93.22 (2)°, and Z = 2. The X-ray data refine to an RF = 0.067 for 664 reflections with F2 > σF2. The fluoroxysulfate anion has distorted tetrahedral coordination with each central sulfur atom bound to four oxygens. The S-0 bond distances are 1.435 (8), 1.426 (8), 1.441 (7), and 1.652 (9) Å. The O-F bond distance is 1.412 (10) Å, and the S-O-F bond angle is 107.8 (6)°. Each Rb- cation is coordinated to nine oxygen atoms and two fluorine atoms. © 1979, American Chemical Society. All rights reserved.