Abstract
The ruthenium(II) complexes [Ru( cis-L)(totpy)(H 2O)](PF 6) 2 ( 1) and [Ru( trans-L) 2(totpy)(H 2O)](PF 6) 2 ( 2) (L = 1,2-bis(diphenylphosphino)ethylene; totpy = 4′-(4-tolyl)-2,2′:6′,2″-terpyridine) were synthesized and characterized by elemental analysis, cyclic and differential pulse voltammetries and UV–vis, IR and 31P NMR spectra. The redox potentials of 2 are less anodic than those of 1. The redox potentials are a result of the different environments created by the phosphine ligands in the trans-complex, associated with their electron donating effect. Electrocatalytic oxidations of benzyl alcohol, cyclohexanol, 1-pentanol, 1,2-butanediol, 1,4-butanediol and cyclohexene were performed using complexes 1 and 2 both in solution and immobilized in carbon paste electrode.
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