Bonding of mono- and polynuclear heteroaromatic nitrogen ligands to the (.eta.5-pentamethylcyclopentadienyl)rhodium dication: structure-reactivity relationships in the formation of nitrogen (.eta.1) versus .pi.(.eta.5,.eta.6) complexes and competition studies of the ligands for the rhodium metal center

The reactions of 4-methylpyridine (1), 3-methylpyridine (2), 2-methylpyridine (3), 3,5-dimethylpyridine (4), 2,4-dimethylpyridine (5), 2,4,6-trimethylpyridine (6), N-methylpyrrole (7), quinoline (8), isoquinoline (9), 2-methylquinoline (10), 1,2,3,4-tetrahydroquinoline (11), N-methylindole (12), acridine (13), phenanthridine (14), 5,6-benzoquinoline (15), and 7,8-benzoquinoline (16) with (η 5 -pentamethylcyclopentadienyl) rhodium dicationic complexes [Cp*Rh(CH 3 CN) 3 ](X 2 ) or [Cp*Rh((CH 3 ) 2 CO) 3 ](X 2 ) (X=PF 6 or BF 4 ) were studied to ascertain how structure influenced the reactivity of ligands, 1-16, to provide nitrogen (N) versus π-bonded Cp*Rh 2+ complexes