Semireduced bridging ligands containing N-N multiple bond coordination sites. ESR study of binuclear Group 6 metal carbonyl complexes. Inorganic Chemistry, (25)19:3442--3448, 1986. [PUMA: ESR azobipyridine binuclear ESR;ENDOR complex complex;pyridyltetrazine complex;ESR azopyridine ESR;tetrazine molybdenum carbonyl VIB]