Reactivity studies Of η6-arene ruthenium (II) dimers with polypyridyl ligands:: isolation of mono, binuclear p-cymene ruthenium (II) complexes and bisterpyridine ruthenium (II) complexes

The complexes [(eta(6)-p-cymene)RuCl(L-2)](+) where L-2 = 2,2'-biquinoline (biqui) (3), 2,9-dimethyl 4,7-diphenyl-1,10-phenanthroline (ddp) (4), and 2,3-bis(alpha-pyridyl) quinoxaline (bpq) (5) were obtained by halide bridge cleavage of [{(eta(6)-p-cymene)Ru(mu-Cl)}(2)Cl-2] (1) with the corresponding ligands. The ligand bridged binuclear compound [{(eta(6)-cymene)RuCl}(2)(bpq)](2+) (6) was also obtained by treating I with stoichiometric amount of bpq in methanol. The reactions of [{(eta(6)-arene)Ru(mu-Cl)}(2)Cl-2], {arene=p-cymene (1), hexamethylbenzene (2)1 with substituted phenylterpyridines (x-phterpy, x = H, CH3, OCH3) yielded his terpyridine complexes of the type [(x-phterpy)(2)Ru](2+) by the facile displacement of eta(6)-arene ring as well as chloride ligands. These complexes were characterized by FT-NMR, FT-IR spectroscopy, and analytical data. The molecular structures of [(eta(6)-p-cymene)RuCl(biqui)]PF6 (3) and [(eta(6)-p-cymene)RuCl(bpq)]PF6 (5) have been determined by single crystal X-ray diffraction study. (C) 2003 Elsevier Ltd. All rights reserved.