Bonding mode of nitrogen heterocyclic ligands to (.eta.5-cyclopentadienyl)ruthenium cation and reactivity studies of the nitrogen and .pi.-bonded complexes: mechanistic aspects of a nitrogen to .pi. rearrangement

The nitrogen heterocyclic ligands pyridine, 2-methylpyridine, 2,4-dimethylpyridine, 2,4,6-trimethylpyridine, quinoline, isoquinoline, 2-methylquinoline, and 1,2,3,4-tetrahydroquinoline were reacted with (η 5 -cyclopentadienyl)ruthenium cation, [CpRu(CH 3 CN) 3 ](PF 6 ), to ascertain the mode of bonding as a function of structure, i.e., nitrogen (η 1 (N)) versus π (η 6 ) bonding