Electron spin reasonance spectra of the perruthenate(VII) ion, [RuO4]–

Abstract

Electron spin resonance spectra of the [RuO₄]^– ion {as A[RuO₄], where A = NPrⁿ₄, N(PPh₃)₂ or PPh₄} in frozen glasses of dichloromethane at ca. 90 K have been recorded; for A = NPrⁿ₄, g_x= 1.93, g_y= 1.98 and g_z= 2.06. The spectrum of [RuO₄]^–(and its electronic spectrum) have been interpreted and compared with those of an alkaline aqueous solution containing ruthenium(VII) species. The ESR spectrum of powdered potassium ruthenate(VI), trans-K₂[RuO₃(OH)₂], at ca. 90 K was also recorded, and the preparation of [PPh₄][RuO₄]^–, a new salt of [RuO₄]^–, is described.