Stabilization of biochemically interesting intermediates by metal coordination. 6. Charge transfer in complexes of 1,3-dimethyllumazine with low-valent metals. Inorganic Chemistry, (28)26:4645--4648, 1989. [PUMA: charge complex complex;electrochem complex;ruthenium complex;transition lumazine lumazine;copper lumazine;rhenium metal redox transfer transition]