Study of half sandwich platinum group metal complexes containing tetradentate N-donor ligand bearing two di-pyridylamine units linked by an aromatic spacer

Abstract

A general approach for the preparation of dinuclear η 5- and η 6-cyclic hydrocarbon platinum group metal complexes, viz. [(η 6-arene) 2Ru 2( NN∩ NN)Cl 2] 2+ (arene = C 6H 6, 1; p- iPrC 6H 4Me, 2; C 6Me 6, 3), [(η 5-C 5Me 5) 2M 2( NN∩ NN)Cl 2] 2+ (M = Rh, 4; Ir, 5), [(η 5-C 5H 5) 2M 2( NN∩ NN)(PPh 3) 2] 2+ (M = Ru, 6; Os, 7), [(η 5-C 5Me 5) 2Ru 2( NN∩ NN)(PPh 3) 2] 2+ ( 8) and [(η 5-C 9H 7) 2Ru 2( NN∩ NN)(PPh 3) 2] 2+ ( 9), bearing the bis-bidentate ligand 1,2-bis(di-2-pyridylaminomethyl)benzene ( NN∩ NN), which contains two chelating di-pyridylamine units connected by an aromatic spacer, is reported. The cationic dinuclear complexes have been isolated as their hexafluorophosphate or hexafluoroantimonate salts and characterized by use of a combination of NMR, IR and UV–vis spectroscopic methods and by mass spectrometry. The solid state structure of three derivatives, [ 2][SbF 6] 2, [ 3][PF 6] 2 and [ 4][PF 6] 2, has been determined by X-ray structure analysis.