Cyclization reaction dynamics of an inverse type diarylethene derivative as revealed by time-resolved absorption and fluorescence spectroscopies

Abstract

Time-resolved absorption and fluorescence spectroscopies revealed the cyclization reaction dynamics of an inverse diarylethene derivative.

Excited state dynamics of normal dithienylethene molecules either isolated or deposited on an argon cluster

“…Many experiments, often complemented by TDDFT calculations, were conducted using a femtosecond transient absorption spectroscopy technique to study the mechanism of the ring-closure and photoreversion reactions of dithienylethene molecules dissolved in solvents. [2][3][4][5] A concern exists indeed about the ring-closure reaction, as the open-ring isomer has several conformers which are in thermal equilibrium at room temperature. They fall into two categories depending on whether the aromatic groups of the side chains are parallel (P) or antiparallel (AP) to each other.…”

“…Only AP isomers can undergo the ring closure reaction. Recently, Sotome et al 3 showed that 1,2-bis(3-methyl-5-phenyl-2-thienyl)perfluorocyclopentene (an “ inverse ” dithienylethene molecule) has one P and two AP conformers, but only one of the former makes the ring-closure reaction. Jarota et al , 2 Li et al 4 and Hamdi et al 5 investigated various “ normal ” dithienylethene molecules dissolved in solvents.…”

Synthesis, structure–property relationships and absorbance modulation of highly asymmetric photochromes with variable oxidation and substitution patterns

“…[52][53] On the other hand, the 2thienyl substituted "inverse type" diarylethenes undergo ringclosure reactions under irradiation in the short wavelength region, and some of them are known to be fluorescent in their open forms (OFs). 54 While these chemical modifications are key to customize the photophysical properties, the studies of sulfone (SO 2 ) and "inverse type" diarylethenes were focused on highly symmetric structures.…”

“On-The-Fly” Non-Adiabatic Dynamics Simulations on Photoinduced Ring-Closing Reaction of a Nucleoside-Based Diarylethene Photoswitch

“…An in-depth understanding of relevant photophysical and photochemical processes of photoswitches is of fundamental importance for the design of novel photoswitches with better performances. Therefore, many time-resolved spectroscopical works have been carried out to explore the underlying photochromic mechanism of various diarylethenes [ 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 ]. Particularly, Jäschke’s group applied femtosecond transient absorption spectroscopy to study the photoinduced pericyclic and cycloreversion reactions of PS-IV [ 36 , 37 ].…”