The synthesis and structure of heteroleptic tris(diimine)ruthenium(II) complexes

Christopher M. Kepert, Alan M. Bond, Glen B. Deacon, Leone Spiccia, Brian W. Skelton, Allan H. White

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The reactions of bidentate diimine ligands (L2) with cationic bis(diimine)[Ru(L)(L1)(CO)Cl]- complexes (L, L 1, L2 are dissimilar diimine ligands), in the presence of trimethylamine-N-oxide (Me3NO) as a decarbonylation reagent, lead to the formation of heteroleptic tris(diimine) ruthenium(II) complexes, [Ru(L)(L1)(L2)]2-. Typically isolated as hexafluorophosphate or perchlorate salts, these complexes were characterised by UV-visible, infrared and mass spectroscopy, cyclic voltammetry, microanalyses and NMR spectroscopy. Single crystal X-ray studies have elucidated the structures of K[Ru(bpy)(phen)(4,4′-Me2bpy)](PF 6)3·1/2H2O, [Ru(bpy)(5,6-Me 2phen)(Hdpa)](ClO4)2, [Ru(bpy)(phen)(5,6- Me2phen)](ClO4)2, [Ru(bpy)(5,6′-Me 2phen)(4,4′-Me2bpy)](PF6) 2·EtOH, [Ru(4,4′-Me2bpy)(phen)(Hdpa)](PF 6)2·MeOH and [Ru(bpy)(4,4′-Me 2bpy)(Hdpa)](ClO4)2·1/2Hdpa (where Hdpa is di(2-pyridyl)amine). A novel feature of the first complex is the presence of a dinuclear anionic adduct, [K2(PF6)6] 4-, in which the two potassium centres are bridged by two fluorides from different hexafluorophosphate ions forming a K2F2 bridging unit and by two KFPFK bridging moieties.

Original languageEnglish
Pages (from-to)1766-1774
Number of pages9
JournalDalton Transactions
Issue number11
Publication statusPublished - 7 Jun 2004

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