title: Enhanced Photostability of a Ruthenium(II) Polypyridyl Complex under Highly Oxidizing Aqueous Conditions by Its Partial Inclusion into a Cyclodextrin.
abstract: The complex [Ru(bpy)2 L](2+) , where bpy=2,2'-bipyridine, L=4-(phenylethynyl)-2,2'-bipyridine, was prepared in its racemic and resolved forms (Δ and Λ). The phenylethynyl unit on the bipyridine for the complex acts as a binding site for α-cyclodextrin in water (1:1 complex, K=3390 L mol(-1) ) or β-cyclodextrin (2:1 complex, K1 =887 L mol(-1) , K2 =8070 L mol(-1) ). The presence of the cyclodextrin provides partial protection to the complex under light-activated water oxidation conditions.
authors.affiliation: Molecular Photonics Laboratory, School of Chemistry, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK. pau.farras@ncl.ac.uk.|School of Chemistry, NUI Galway, Galway, Ireland. pau.farras@ncl.ac.uk.
authors.forename: Pau
authors.initials: P
authors.lastname: Farras
authors.affiliation: Institute for Cell and Molecular Biosciences, Medical School, Newcastle University, Newcastle upon Tyne, NE2 4HH, UK.
authors.forename: Helen
authors.initials: H
authors.lastname: Waller
authors.affiliation: Molecular Photonics Laboratory, School of Chemistry, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK. a.c.benniston@ncl.ac.uk.
authors.forename: Andrew C
authors.initials: AC
authors.lastname: Benniston
keywords: chirality; cyclodextrin; photooxidation; photosensitizers; ruthenium