title: Photoregulated fluorescence switching in axially coordinated tin(IV) porphyrinic dithienylethene.
abstract: Photochromic fluorophore Sn(TTP)(DTE)2 , in which two phenolic derivatives of 1,2-dithienylethene are axially coordinated to (5,10,15,20-tetratolylporphyrinato)tin(IV) in trans position, has been synthesized and fully characterized by various spectroscopic methods. We have also investigated the photoregulated fluorescence switching behavior of Sn(TTP)(DTE)2 . The fluorescence of the porphyrin macrocycle in Sn(TTP)(DTE) 2 greatly depends on the state of the 1,2-dithienyletene photochromic switch. In the open state (Sn(TTP)(o-DTE)2), the porphyrin exhibits high fluorescence intensity at 609 and 664 nm when excited at 410 nm. When the photocyclization reaction was carried out by irradiating Sn(TTP)(o-DTE)2 with the UV light (approximately 365 nm), the fluorescence intensity of the porphyrin macrocycle decreased. Back irradiation with visible light at wavelengths greater than 500 nm regenerated Sn(TTP)(o-DTE)2 and almost restored the original fluorescence spectrum. The fluorescence intensity of the porphyrin fluorophore is efficiently regulated by photochromic switching between Sn(TTP)(o-DTE)2 and Sn(TTP)(c-DTE)2 in several cycles, clearly demonstrating that the Sn(TTP)(DTE)2 can act as a system for reversible data processing using fluorescence as the detection method.
authors.affiliation: Department of Applied Chemistry, Kumoh National Institute of Technology, 1 Yangho-dong, Gumi 730-701, Republic of Korea.
authors.forename: Hee Jung
authors.initials: HJ
authors.lastname: Kim
authors.forename: Joon Hee
authors.initials: JH
authors.lastname: Jang
authors.forename: Hyunbong
authors.initials: H
authors.lastname: Choi
authors.forename: Taegweon
authors.initials: T
authors.lastname: Lee
authors.forename: Jaejung
authors.initials: J
authors.lastname: Ko
authors.forename: Minjoong
authors.initials: M
authors.lastname: Yoon
authors.forename: Hee-Joon
authors.initials: HJ
authors.lastname: Kim