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)

Abstract

Ligand displacement reactions of the complexes of the type(Ar)Ru(PPh₃)₂(CH₃CN)]PF₆ {Ar=Cp*(<b>1</b>) and indenyl (<b>2</b>)} have been investigated with N₃- 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* (<b>1</b>) and indenyl (<b>2</b>)} are reacted with these ligands to form stable complexes of the type [Cp*Ru(PPh₃)(phterpy)]BF₄ (<b>3</b>), [Cp*Ru(PPh₃)(pyterpy)]BF₄ (<b>4</b>), [(η⁵ind)Ru(PPh₃)(phterpy)]PF₆ (<b>5</b>), [(η⁵ind)Ru(PPh₃)(pyterpy)]PF₆ (<b>6</b>), [(Cp*Ru(PPh₃)}₂ (diterpy)](BF₄)₂ (<b>7</b>) and [(η⁵ind)Ru(PPh₃)}₂(diterpy)](PF₆)₂ (<b>8</b>) where respective ligands are coordinated in a bidentate fashion. When these reactions are carried out with chloro analogues [Cp*Ru(PPh₃)₂Cl] (<b>9</b>) and [(η⁵-ind)Ru(PPh₃)₂Cl] (<b>10</b>) with respective ligands viz. phterpy and pyterpy, a mixture of products are isolated including the complex type <b>3-6</b> and [RuCl(PPh₃)₂(N₃-phterpy)]PF₆ (<b>11</b>) and [RuCl(PPh₃)₂(N₃-Pyterpy)]PF₆ (<b>12</b>) respectively. All these complexes have been characterized by spectral and analytical data.