Paramagnetism of Tetranuclear Complexes between TCNX Ligands (TCNE, TCNQ, TCNB) and Four Pentaammineruthenium or Dicarbonyl(pentamethylcyclopentadienyl)manganese Fragments. Inorganic Chemistry, (36)15:3248--3252, 1997. [PUMA: ruthenium paramagnetism;paramagnetism paramagnetism;TCNE paramagnetism;TCNQ ammine paramagnetism complex paramagnetism;methylcyclopentadienyl manganese complex;TCNB]