Photoisomerization and optical properties of a subphthalocyanine–azobenzene–subphthalocyanine triad. Issue 75 (26th July 2016)

• Record Type: Journal Article
• Authors: Shi, Maohu; Zhao, Yue; Xu, Haijun; Mack, John; Yin, Luan; Wang, Xiaoyong; Shen, Zhen
• Is Part Of: RSC advances. Volume 6:Issue 75(2016)
• Page Start: 71199
• Page End: 71205
• Publication Date: 2016-07-26
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra11452k
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A novel subPc–AB–subPc triad exhibits on–off switching of the fluorescence emission intensity upon reversible trans ↔ cis photoisomerization of the azobenzene moiety. NMR spectroscopy provides additional evidence for the conformational change. Abstract : The synthesis and characterization of a subphthalocyanine–azobenzene–subphthalocyanine triad is reported. Evidence for trans ↔ cis isomerization of the linking azobenzene moiety is observed in the NMR and optical spectra when the subphthalocyanine rings are used as light-harvesting units. Significantly, a decrease in fluorescence intensity is observed on moving from trans → cis with a recovery in intensity observed on moving back from cis → trans that can be attributed to a change in the rate of non-radiative decay.