title: Dinuclear ruthenium complexes containing the Hpbl ligand: synthesis, characterization, linkage isomerism, and epoxidation catalysis.
abstract: Three dinucleating Ru-Cl complexes containing the hexadentate dinucleating ligand [1,1'-(4-methyl-1H-pyrazole-3,5-diyl)bis(1-(pyridin-2-yl)ethanol)] (Hpbl) and the meridional 2,2':6',2″-terpyridine ligand (trpy) have been prepared and isolated. These complexes include {[RuCl(trpy)]2(μ-pbl-κ-N(3)O)}(+) (1a(+)), {[RuCl(trpy)]2(μ-Hpbl-κ-N(3)O)}(2+) (1b(2+)), and {[RuCl(trpy)]2(μ-Hpbl-κ-N(2)O(2))}(2+) (1c(2+)) and were characterized by analytic and spectroscopic techniques. In addition, complexes 1b(2+) and 1c(2+) were characterized in the solid state by monocrystal X-ray diffraction analysis. The coordination versatility of the Hpbl ligand allows the presence of multiple isomers that can be obtained depending on the Ru oxidation state and were thoroughly characterized by electrochemical techniques, namely, cyclic voltammetry and coulometry. Finally, 1a(+) and its recently reported mononuclear analogue, in-[RuCl(Hpbl)(trpy)](+), have been tested as catalysts for epoxidation of cis-β-methylstyrene.
authors.affiliation: Institute of Chemical Research of Catalonia (ICIQ) , Av. Països Catalans 16, E-43007 Tarragona, Spain.
authors.forename: Laia
authors.initials: L
authors.lastname: Francàs
authors.forename: Rosa María
authors.initials: RM
authors.lastname: González-Gil
authors.forename: Daniel
authors.initials: D
authors.lastname: Moyano
authors.forename: Jordi
authors.initials: J
authors.lastname: Benet-Buchholz
authors.forename: Jordi
authors.initials: J
authors.lastname: García-Antón
authors.forename: Lluís
authors.initials: L
authors.lastname: Escriche
authors.forename: Antoni
authors.initials: A
authors.lastname: Llobet
authors.forename: Xavier
authors.initials: X
authors.lastname: Sala