Homo- and heterodinuclear complexes of D2h-symmetric bis(chelate) ligand 2,2'-bipyrimidine with electron-rich metal fragments Mo(CO)4, Re(CO)3Cl, Cu(PPh3)2+, and Ru(bpy)22+. Zeitschrift fuer Anorganische und Allgemeine Chemie, (593):147--159, 1991. [PUMA: bipyridine dinuclear;molybdenum heterodinuclear;electrochem dinuclear;redn electrochem metal heterodinuclear;solvatochromism heterodinuclear redox bipyrimidine carbonyl transition heterodinuclear;oxidn heterodinuclear;ruthenium dinuclear;rhenium copper homodinuclear phosphine]