Gating the photoactivity of azobenzene-type ligands trapped within a dynamic system of an M4L6 tetrahedral cage, an M2L2 metallocycle and mononuclear MLn complexes. Issue 24 (9th November 2021)

• Record Type: Journal Article
• Authors: Cecot, Piotr; Walczak, Anna; Markiewicz, Grzegorz; Stefankiewicz, Artur R.
• Is Part Of: Inorganic chemistry frontiers. Volume 8:Issue 24(2021)
• Page Start: 5195
• Page End: 5200
• Publication Date: 2021-11-09
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d1qi01063h
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : Complexation of metal ions by a ligand bearing a azobenzene linker yielded two types of complexes: an [M2 L 2 ] 4+ metallocycle and an [M4 L 6 ] 8+ tetrahedral cage, which can be further converted into libraries of mononuclear [M(L ′/L ′′) n ] 2+ species. Abstract : Complexation of transition metal ions by a doubly chelating bis(diimine)-type ligand incorporating a photoresponsive azobenzene linker yielded two types of structurally distinct metallosupramolecular architectures, an [M4 L 6 ] 8+ tetrahedral cage and an [M2 L 2 ] 4+ metallocycle. In solution, these complexes are open for reversible interconversions between each other by varying the M : L ratio, or switching into a dynamic library of [M(L′ /L′′ ) n ] 2+ mononuclear species upon addition of a competing monoamine. While the unbound ligand presents the reversible photoactivity of the azo bond, its complexes are photochemically inert, due to the inherent topology of these assemblies resulting from the restrictions of coordinate bond formation.