Basic Strategy and Methods of Preparation for Supramolecules

Electrochemical switching in mechanically interlocked molecules (MIMs)

“…78,79 Herein, they showed the synthesis (Fig. 3a), and functioning of a linear molecular pump, crafted as an intermediate [2]rotaxane. It is formed through the controlled threading (under redox/thermal influence) and unthreading (also under redox/thermal control) of a CBPQT 4+ ring along a molecular dual pump (MDP 6+ ) dumbbell.…”

“…Subsequent oxidation separates these complexes due to coulombic repulsion. One CBPQT 4+ ring undergoes rearrangement to form a stable [2]rotaxane, while the second simply unthreads (Stage -III, Fig. 3b).…”

“…3b). A second reduction prompts the remaining [2]rotaxane to form a complex with the terminal BIPY +• unit. (Stage -IV, Fig.…”

“…Pioneering work led by Stoddart, 92, 93 Sauvage, 94 and Leigh, 95,96 established the effectiveness of electrochemical switching in rotaxanes. For instance, Stoddart and Wasielewski reported the electroswitching of bistable [2]rotaxane in the ground and excited state electronic configuration of BODIPY 53 (Fig. 6).…”

“…When exposed to UV (365 nm)/Vis (525 nm) light, the Z/E photoisomerization of the AB unit-initiated movement, prompting one CBPQT 4+ wheel Fig. 6 Redox actuation of a bistable BODIPY rotor [2]. Reproduced with permission from ref.…”