PREPARATION OF S7X+MF6- (X = F, CL, M = AS, SB) AND VIBRATIONAL-SPECTRA OF THE SERIES S7F+, S7CL+, S7BR+, S7I+

The salts S7F+MF6− and S7Cl+MF6− (M = As, Sb) have been prepared by reaction of S82+(MF6−)2 with NaF and KCl in liquid SO2. In comparison to those of the known compounds S7Br+MF6− and S7I+MF6−, their thermal stabilities are much smaller. The new products have been characterized by analytical and spectroscopic methods. IR and Ra spectra of the complete series S7X+MF6− (X = F, Cl, Br, I; M = As, Sb) have been recorded and the SX and SS stretching vibrations can be assigned: v(SF) = 804, v(SCl) = 528, v(SBr) = 416, v(SI) = 353 cm−1; v(SS) for the ring system are found in the range 570-330 cm−1. © 1990, American Chemical Society. All rights reserved.