Acid-Base Controlled Nano-Bending Lassos to Manipulate Photo-Switching Units in [1]Rotaxanes

Abstract: provided is acid-base controlled nano-bending lassos to manipulate photo-switching units in [1]rotaxanes, which contain sequentially bonded a macrocyclic moiety including a cyclic polyether moiety, a photochromic photo-switching moiety, a first station moiety including a secondary ammonium group, a linear moiety, a second station moiety being capable of forming multiple hydrogen bonding with the macrocyclic moiety, and an aggregation-induced emission stopper moiety. under the base condition (in the loosened lasso form), the photochromic photo-switching moiety can perform a ring-closing reaction upon ultraviolet light exposure, and a ring-opening reaction can occur when exposed to visible light. however, the mentioned photo-switchable ring-closing and ring-opening reactions cannot proceed under the acidic condition (in the tightened lasso form). a linear moiety is bonded to the first station moiety and passes through the macrocyclic moiety. the photo-switching moiety and the stopper moiety are located on both sides of the macrocyclic moiety.

Inventor(s): Hong-Cheu Lin, Manh-Khang Trang, Yaw-Kuen Li

CPC Classification: C07D409/14 (HETEROCYCLIC COMPOUNDS (macromolecular compounds ))

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