Controlling Excited-State Dynamics and Chemical Reactivities of Platinum Acetylide Complexes via Self-Threading Ligands with Permethylated α-Cyclodextrin

Abstract

Abstract Exterting control over the excited-state dynamics and chemical reactivities of transition metal complexes allows an enhancement in their physical properties and the development of their applications to novel materials. Hence, in this study, transition metal complexes were incorporated into a protective environment using permethylated α-cyclodextrin (PM α-CD)-based macrocycles. As a novel design concept for protective ligands in transition metal complexes, the macrocyclic PM α-CDs were efficiently introduced and fixed close to the metal centers via covalent bonding with the self-threading structures of rigid π-conjugated ligands. The protection of the transition metal complexes prevented undesired conformational changes and chemical reactions, thereby enhancing their functional properties and revealing the potential reactivities of the transition metals. In this account, the unique chemical reactivities and optical properties of transition metal complexes protected with PM α-CDs are summarized, with a focus on the distinctive features of platinum acetylide complexes and their applications to polymer materials.