Neutral spin-delocalized mixed-valence manganese(I)-manganese(II) dimers bridged by alkoxide, imidazolate, or malonodinitrile anions. Inorganic Chemistry, (25)27:4865--4870, 1986. [PUMA: alkoxide anion complex complex;ESR complex;intervalence complex;malononitrile complex;manganese dimeric manganese mixed transition valence valence;imidazolate]