- Electron-donating methoxyl group position effect on properties of diarylethene derivatives having a pyrazole unit
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New types of asymmetrical photochromic diarylethene derivatives having a pyrazole unit, namely 1-[1,3,5-trimethyl-1-pyrazol-4-yl],2-[2-methyl-5-(4- methoxylphenyl)-1-thien-3-yl]perfluorocyclopentene (1a), 1-[1,3,5- trimethylpyrazol-4-yl],2-[2-methyl-5-(3-methoxylphenyl)-1-thien-3-yl] perfluorocyclopentene (2a), 1-[1,3,5-trimethyl-pyrazol-4-yl],2-[2-methyl-5-(2- methoxylphenyl)-1-thien-3-yl]perfluorocyclopentene (3a), and 1-[1,3,5-trimethyl-pyrazol-4-yl],2-[2-methyl-5-phenyl-1-thien-3-yl] perfluorocyclopentene (4a), were synthesized. Their optical and electrochemical properties, such as photochromism, photochromic cyclization-cycloreversion kinetics, and fluorescence and electrochemical properties were investigated in detail. The results show that all of these- compounds have good photochromism, high cycloreversion quantum yield, and relatively strong fluorescence. Their cyclization-cycloreversion processes were determined to be zeroth to first order reactions. The oxidations of diarylethenes 1a-4a were initiated at 0.73, 1.11, 0.79, and 1.03 V, respectively. Furthermore, introduction of the electron-donating methoxyl group at different positions of the terminal phenyl ring was found to strongly influence these optical and electrochemical properties.
- Yang, Tianshe,Pu, Shouzhi,Chen, Bing,Xu, Jingkun
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- Syntheses and properties of new photochromic diarylethene derivatives having a pyrazole unit
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New photochromic diarylethenes 1a, 2a and 3a bearing a pyrazole unit have been synthesized. Their properties, including photochromic reactivity, fluorescence and electrochemical properties were investigated. These compounds showed good photochromic proper
- Pu, Shouzhi,Yang, Tianshe,Xu, Jingkun,Chen, Bing
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p. 6473 - 6477
(2007/10/03)
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