我们报告了一种独特的光可调细胞杀伤技术,它使用二芳基乙烯分子作为光异构化分子开关。由于紫外线产生的闭合形式,这些分子被输送到细胞核中的 DNA,然后蓝光触发细胞杀伤。紫外光照射将没有 DNA 嵌入活性的开放形式转换为封闭形式,以诱导 DNA 中的嵌入。这种异构体,因此准备好采取行动,在随后的蓝光照射下发挥光细胞毒性。分子生物学分析表明,光细胞毒性是由 DNA 双链断裂引起的。由于只有在开环和闭环异构体都有吸收的光照射下才会观察到细胞死亡,细胞死亡的可能机制被认为是由于二芳基乙烯分子的重复光环化和光环化反应,对 DNA 造成无法修复的损伤。细胞系统中这种独特的光可控作用可以为新型光疗方案提供基础。
Substituent effect on the photochromic reactivity of bis(2-thienyl)perfluorocyclopentenes
摘要:
Substituent effect on the photochromic reactivity of bis(2-thienyl)perfluorocyclopentenes was examined. introduction of phenyl groups having electron-donating substituents on the para-position of the phenyl ring to the 5-position of the thiophene rings shifted the absorption bands of the open-ring isomers to longer wavelengths and reduced the quantum yield of the cyclization reactions. The substitution with p-(N,N-diethylamino)phenyl groups prohibited the cyclization reaction. The absorption spectra of the closed-ring isomers were not influenced by the substitution. (C) 2001 Elsevier Science Ltd. All rights reserved.
Crystals consisting of the closed-ring form of 1,2-bis(3-methyl-5-phenyl-2-thienyl)perfluorocyclopentene underwent a photochemical ring-opening reaction accompanying crystal fragmentation upon irradiation with visible light. The open-ring form crystal produced by the ring-opening reaction exhibited green fluorescence, whereas open-ring form crystals produced by recrystallization exhibit orange or yellow
Diarylethene derivatives with oxidized thiophene rings shift their absorption band to a shorter wavelength in the UV region upon photocyclization; no colorchange was observed during the photochromic reaction, and the invisible photochromism is advantageous for devices used under room light.
Substituent effect on the photochromic reactivity of bis(2-thienyl)perfluorocyclopentenes was examined. introduction of phenyl groups having electron-donating substituents on the para-position of the phenyl ring to the 5-position of the thiophene rings shifted the absorption bands of the open-ring isomers to longer wavelengths and reduced the quantum yield of the cyclization reactions. The substitution with p-(N,N-diethylamino)phenyl groups prohibited the cyclization reaction. The absorption spectra of the closed-ring isomers were not influenced by the substitution. (C) 2001 Elsevier Science Ltd. All rights reserved.