...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Excited-state behavior of a fluorescent and photochromic diarylethene on silver nonoparticles
【24h】

Excited-state behavior of a fluorescent and photochromic diarylethene on silver nonoparticles

机译：荧光和光致变色二芳基乙烯在银纳米颗粒上的激发态行为

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Silver (Ag) nanoparticles covered with a photochromic diarylethene derivative that has an anthracene unit were synthesized by Brust's method and their photochromic and fluorescent performance were studied by using absorption and fluorescence spectroscopy. The diarylethene ligand showed a reversible photochromic reaction and the open-ring isomer emitted fluorescence (Phi(f) = 0.009). On the surface of the Ag nanoparticles, the diarylethene showed normal reversible photochromic reactions; however, the conversion from the open-to the closed-ring isomer decreased from 81 to 16%. Besides, fluorescence from the anthracene unit was quenched to 7.6% of the unbound state. Quantum yield analysis showed that the cyclization reaction was efficiently quenched while the cycloreversion reaction was scarcely affected. The kinetic analysis on the excited states of the open- and the closed-ring isomers was carried out. The cycloreversion reaction was quenched by the Ag nanoparticles by the rate of 2.8 x 10(10) s(-1), while the quenching rate constant of the cyclization was 9.1 x 10(11) s(-1). These results indicate that the quenching of the excited-state is due to the excited energy transfer from the diarylethene to the Ag nanoparticles, and that the overlap between the fluorescence of diarylethene and the plasmon absorption of Ag nanoparticles regulates the quenching of the excited-state of organic molecules on the Ag nanoparticles.
机译：用Brust方法合成了覆盖有蒽单元的光致变色二芳基乙烯衍生物的银（Ag）纳米粒子，并通过吸收和荧光光谱研究了它们的光致变色和荧光性能。二芳基乙烯配体显示出可逆的光致变色反应，开环异构体发出荧光（Phi（f）= 0.009）。在Ag纳米粒子的表面上，二芳基乙烯显示出正常的可逆光致变色反应。但是，从开环异构体到闭环异构体的转化率从81％降低到16％。此外，来自蒽单元的荧光被猝灭至未结合态的7.6％。量子产率分析表明环化反应被有效地淬灭，而环还原反应几乎没有受到影响。对开环和闭环异构体的激发态进行了动力学分析。 Ag纳米粒子以2.8 x 10（10）s（-1）的速率淬灭环还原反应，而环化的淬灭速率常数为9.1 x 10（11）s（-1）。这些结果表明，激发态的猝灭是由于激发能量从二芳基乙烯转移到Ag纳米颗粒，并且二芳基乙烯的荧光和Ag纳米颗粒的等离子体吸收之间的重叠调节了激发态的猝灭。 Ag纳米颗粒上的有机分子的分布。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号