Radical Double Helicates of Silver Imino Nitroxides, [Ag<sub>2</sub>(pyrd-im2)<sub>2</sub>](PF<sub>6</sub>)<sub>2</sub>·2CH<sub>3</sub>OH and [Ag<sub>2</sub>(bpy-im2)<sub>2</sub>](PF<sub>6</sub>)<sub>2</sub>·CH<sub>3</sub>OH OshioHiroki YaginumaTaira ItoTasuku 1999 Radical Double Helicates of Silver Imino Nitroxides, [Ag<sub>2</sub>(pyrd-im2)<sub>2</sub>](PF<sub>6</sub>)<sub>2</sub>·2CH<sub>3</sub>OH and [Ag<sub>2</sub>(bpy-im2)<sub>2</sub>](PF<sub>6</sub>)<sub>2</sub>·CH<sub>3</sub>OH