The electron spin resonance spectrum of the fulvalene radical anion

Abstract

The fulvalene radical anion has been prepared by the oxidation of cyclopentadienyl-lithium or dilithium fulvalenediide with oxygen, and by the reduction of fulvalene with sodium, or electrolytically. The e.s.r. spectrum shows a(H-2,-2′,-5,-5′) 1.55, a(H-3,-3′,-4,-4′) 3.70, a(¹³C-1,-1′) 2.90, a(¹³C-2,-2′,-5,-5′) 1.40, and a(¹³C-3,-3′,-4,-4′) 2.15 G. The assignments for a(H) are based on the HMO model, and those for a(¹³C) on the Yonezawa–Kawamura–Kato relationship.