Fluorosulfate Derivatives of Divalent Gold.

Abstract The reduction of gold(III) fluorosulfate, Au(SO 3 F) 3 with either gold powder or carbon monoxide, in fluorosulfuric acid, HSO 3 F, yields gold(II) fluorosulfate as a yellow-red solid in high yield. Based on magnetic measurements and vibrational spectra, formulation as mixed valency Au(I) Au(III)- (SO 3 F) 4 is suggested. Evidence from ESR measurements for a solvated, paramagnetic Au(II)-species in the supernatant solution is obtained and discussed.