Two macrocycles bearing four dithienylethene units were synthesized. Upon irradiation of the macrocycles 5 and 6 with ultraviolet light, only one or two photo-induced cyclization reaction occurs. Each isomers were isolated and analyzed by 1H NMR spectrum. The quantum yield of 5 and 6 are 0.58 and 0.64, respectively. The high value is due to the presence of enforced antiparallel conformation in the macrocycles 5 and 6.
Bibliographical noteFunding Information:
This work was supported by the KOSEF through National Research Laboratory (NRL 2005) program awarded to J.K.
All Science Journal Classification (ASJC) codes
- Drug Discovery
- Organic Chemistry