Synthesis and Characterization of Unsymmetrical Diarylethene Based on Phenylpentane

An unsymmetrical photochromic diarylethene, 1-[2-methyl-3-benzothiophene]-2-[2-methyl-5-(4-pentylphenyl)-3-thienyl] perfluorocyclopentene (1a), has been synthesized, and its properties including photochromism and fluorescence have been investigated. The results showed that this compound undergo reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light in solution.

Synthesis and Application of 1-(2,5-dimethyl-3-thiazolyl)-2-[2-methyl-5-phenyl-(4-vinyl)-3-thiophene]perfluorocyclopentene

A new unsymmetrical photochromic diarylethene 1-(2,5-dimethyl-3-thiazolyl)-2-[2-methyl-5-phenyl-(4-vinyl)-3-thiophene] perfluorocyclopentene (1o) was designed and constructed successfully. And its photochromic reactivity, HPLC, kinetics were also investigated systematically. Upon alternating irradiation with UV and visible light in solution, this compound exhibited reversible photochromism, undergoing reversible cyclization and cycloreversion reactions. Diarylethene 1 changed the color from colorless to orange, in which absorption maxima were observed at 596 nm in acetonitrile. What is more, the photoconversion ratio of 1 is 37%.

Synthesis and Application of 1-[(2-methyl-3-benzothiophene)]-2-[2-methyl-5-(1,3-dioxolane)-3-thienyl]perfluorocyclopentene

A new unsymmetrical photochromic diarylethene 1-[(2-methyl-3-benzothiophene)]-2-[2-methyl-5-(1,3-dioxolane)-3-thienyl] perfluorocyclopentene (1o) has been synthesized. In the meantime, its photochromic, kinetics and fluorescence properties were investigated in detail. The results showed this compound exhibited reversible photochromism, undergoing reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light in solution [1]. The two isomers differ from each other not only in their absorption spectras, but also in many changes of various physical and chemical properties, such as dielectric constant, refractive index, as well as oxidation/reduction potential, etc [2]. Diarylethene 1 changed the color from colorless to pink upon irradiation with 297 nm UV light, in which absorption maxima were observed at 516 nm in acetonitrile.

Synthesis and Application of 1-[2-Methyl-5-Phenyl-3-Thiophene]-2-[2-Methyl-5-Phenyl-(4-Vinyl)-3-Thiophene]Perfluorocyclopentene

A new unsymmetrical photochromic diarylethene 1-(2-methyl-5-phenyl-3-thiophene)-2-[2-methyl-5-phenyl-(4-vinyl)-3-thiophene] perfluorocyclopentene (1o) has been synthesized, and its photochromic reactivity, fluorescent were also investigated. The results showed this compound exhibited reversible photochromism, undergoing reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light in solution,Diarylethene 1 changed the color from colorless to blue upon irradiation with 297 nm UV light, in which absorption maxima were observed at 596 nm in acetonitrile.

Synthesis and Properties of 1-[2-Methyl-5-(3-Cyanophenyl)-3-Thienyl]-2-[2-Methyl-5-(4-Pentylphenyl)-3-Thienyl]Perfluorocyclopentene

An unsymmetrical photochromic diarylethene which called 1-[2-methyl-5-(3-cyanophenyl)-3-thienyl]-2-[2-methyl-5-(4-pentylphenyl)-3-thienyl] perfluorocyclopentene (1a) was synthesized and its properties such as photochromism and fluorescence were investigated in detail. The results showed that this compound undergo reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light in both solution and a PMMA film.

Synthesis and Properties of [1-(1,2-dimethyl-cyano-3-pyrrole)-2-(2-methyl-5-thienyl-3-thienyl]perfluorocyclopentene

A new unsymmetrical photochromic diarylethene [1-(1,2-dimethyl-cyano-3-pyrrole)-2-(2-methyl-5-thienyl-3-thienyl] perfluorocyclopentene (1o) has been synthesized, and its photochromic reactivity, fluorescent were also investigated. The results showed this compound exhibited reversible photochromism, undergoing reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light in solution,Diarylethene 1 changed the color from colorless to purple upon irradiation with 297 nm UV light, in which absorption maxima were observed at 585 nm in hexane.