1,1'-Diketone and 1,1'-Dinitrile Derivatives of 2,2'-Biimidazole

The crystal structures of 2,2'-biimidazole-1,1'-diacetone, C₁₂H₁₄N₄O₂, and 2,2'-biimidazole-1,1'-diacetonitrile, C₁₀H₈N₆, have been determined. Both molecules crystallize with coplanar rings having substituents in a trans disposition with a center of inversion located midway between the C atoms.

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