title: Structure and properties of Dinuclear [RuII([n]aneS4)] complexes of 3,6-Bis(2-pyridyl)-1,2,4,5-tetrazine.
abstract: The synthesis of dinuclear [Ru(II)([n]aneS(4))] (where n = 12, 14) complexes of the bridging ligand 3,6-bis(2-pyridyl)-1,2,4,5-tetrazine are reported. The X-ray structures of both of the new complexes are compared to a newly obtained structure for a dinuclear [Ru(II)([9]aneS(3))]-based analogue, whose synthesis has previously been reported. A comparison of the electrochemistry of the three complexes reveals that the first oxidation of the [Ru(II)([n]aneS(4))]-based systems is a ligand-based couple, indicating that the formation of the radical anion form of the bridging ligand is stabilized by metal center coordination. Spectroelectrochemistry studies on the mixed-valence form of the new complexes suggest that they are Robin and Day Class II systems. The electrochemical and electronic properties of these complexes is rationalized by a consideration of the pi-bonding properties of thiacrown ligands.
authors.affiliation: Department of Chemistry, University of Sheffield, Sheffield S3 7HF, U.K.
authors.forename: Mike
authors.initials: M
authors.lastname: Newell
authors.forename: James D
authors.initials: JD
authors.lastname: Ingram
authors.forename: Timothy L
authors.initials: TL
authors.lastname: Easun
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Vickers
authors.forename: Harry
authors.initials: H
authors.lastname: Adams
authors.forename: Michael D
authors.initials: MD
authors.lastname: Ward
authors.forename: Jim A
authors.initials: JA
authors.lastname: Thomas