Enhanced Photostability of a Ruthenium(II) Polypyridyl Complex under Highly Oxidizing Aqueous Conditions by Its Partial Inclusion into a Cyclodextrin. Issue 3 (10th December 2015)

• Record Type: Journal Article
• Authors: Farras, Pau; Waller, Helen; Benniston, Andrew C.
• Is Part Of: Chemistry. Volume 22:Issue 3(2016)
• Page Start: 1133
• Page End: 1140
• Publication Date: 2015-12-10
• Subjects: chirality -- cyclodextrin -- photooxidation -- photosensitizers -- ruthenium; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201503485
• Languages: English
• ISSNs: 0947-6539

Abstract

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, K 1 =887 L mol −1, K 2 =8070 L mol −1 ). The presence of the cyclodextrin provides partial protection to the complex under light‐activated water oxidation conditions. Abstract : The protectors : A cyclodextrin has been used to protect a specifically designed ruthenium(II) polypyridyl photosensitizer against photodecomposition in water. The enhanced photostability comes from its inclusion at the easiest‐to‐reduce bipyridine ligand, which is consequently the first to be decomposed upon illumination.