Substituent effect in the photochromism of two isomeric asymmetric diarylethenes having pyrrole and thiophene units.
Two new asymmetric isomeric diarylethenes having pyrrole and thiophene units have been synthesized by one-pot reaction and characterized by single crystal X-ray diffraction analysis. The two prepared diarylethenes had disparate crystal structures, and they exhibited distinctly different photochromic behavior, both in solution and in the solid state. Their photochromism, fatigue resistance, and fluorescence were investigated systematically. The methyl group at the reactive carbon atom could significantly enhance the quantum yield of cyclization step and decrease the quantum yield of cycloreversion step, whereas a cyano group at the same position could notably suppress the photocyclization reaction and promote the photocycloreversion reaction. The results indicated that the substituent at the reactive carbon atom could readily modulate the optoelectronic and physical properties for these diarylethenes.
College of Chemistry, Nanchang University, Nanchang, Jiangxi 330031, PR China; Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, PR China. Electronic address: bio-wrj@163.com.
Renjie
R
Wang
Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, PR China.
Xiaoxia
X
Zhang
College of Chemistry, Nanchang University, Nanchang, Jiangxi 330031, PR China; Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, PR China. Electronic address: pushouzhi@vip.163.com.
Shouzhi
S
Pu
Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, PR China.
Gang
G
Liu
College of Chemistry, Nanchang University, Nanchang, Jiangxi 330031, PR China.
Yanfeng
Y
Dai
Crystal structure; Diarylethene; Fluorescence; Photochromism; Pyrrole