Reactions of [(Ar)Ru(PPh3)2(CH3CN)]X (Ar=Cp*, η5-C5Me5 and indenyl, η5-C9H7; X=PF6 or BF4) with terpyridines:: Hypodentate nature of terpyridines (Phterpy, Pyterpy and Diterpy)

Ligand displacement reactions of the complexes of the type(Ar)Ru(PPh3)(2)(CH3CN)]PF6 {Ar=Cp* (1) and indenyl (2)} have been investigated with N-3-terpyridine ligands, 4'-phenyl-2,2':6',2" terpyridine (phterpy), 4'-(4"'-pyridyl)-2,2':6',2" terpyridine (pyterpy) and 1,4-bis(2,2':6,6" terpyridin-4-yl) benzene (diterpy). The complexes [(Ar)Ru(PPh3)(2)(CH3CN)]PF6 {Ar=Cp* (1) and indenyl (2)} are reacted with these ligands to form stable complexes of the type [Cp*Ru(PPh3)(phterpy)]BF4 (3), [Cp*Ru(PPh3)(pyterpy)]BF4 (4), [(eta(5)ind)Ru(PPh3)(phterpy)]PF6 (5), [(eta(5)ind)Ru(PPh3)(pyterpy)]PF6 (6), [(Cp*Ru(PPh3)}(2) (diterpy)](BF4)(2) (7) and [(eta(5)ind)Ru(PPh3)](2)(diterpy)](PF6)(2) (8) where respective ligands are coordinated in a bidentate fashion. When these reactions are carried out with chloro analogues [Cp*Ru(PPh3)(2)Cl] (9) and [(eta(5)-ind)Ru(PPh3)(2)Cl] (10) with respective ligands viz. phterpy and pyterpy, a mixture of products are isolated including the complex type 3-6 and [RuCl(PPh3)(2)(N-3-phterpy)]PF6 (11) and [RuCl(PPh3)(2)(N-3-pyterpy)]PF6 (12) respectively. All these complexes have been characterized by spectral and analytical data.