H. Oshio et al., Radical double helicates of silver imino nitroxides, [Ag-2(pyrd-im2)(2)](PF6)(2)center dot 2CH(3)OH and [Ag-2(bpy-im2)(2)](PF6)(2)center dot CH3OH, INORG CHEM, 38(11), 1999, pp. 2750
Oligo-pyridyl type diradicals of imino nitroxide are assembled by silver io
ns. In the crystals, four imino nitroxides are arranged to form double stra
nded helicates. A substantial antiferromagnetic interaction between radical
centers through a pyridazyl group was observed.