Excited-State Behavior of a Fluorescent and Photochromic Diarylethene on Silver Nanoparticles
Excited-State Behavior of a Fluorescent and Photochromic Diarylethene on Silver Nanoparticles
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DOI：
10.1021/jp065856q
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发表时间：
2007-02
影响因子：
3.7
通讯作者：
Hidehiro Yamaguchi;K. Matsuda;M. Irie
中科院分区：
文献类型：
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作者：
Hidehiro Yamaguchi;K. Matsuda;M. Irie
采用Brust法合成了含有蒽单元的光致变色二芳基乙烯衍生物包覆的银（Ag）纳米粒子，并利用吸收光谱和荧光光谱研究了其光致变色和荧光性能。二芳基乙烯配体表现出可逆的光致变色反应，开环异构体发射荧光（Φf = 0.009）。在银纳米颗粒的表面上，二芳基乙烯显示正常的可逆光致变色反应;然而，从开环异构体到闭环异构体的转化率从81%下降到16%。此外，来自蒽单元的荧光被猝灭至未结合状态的7.6%。量子产率分析表明，环化反应被有效地淬灭，而环化逆转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。银纳米粒子以2.8 × 1010 s-1的速率猝灭环化反应，而对环化反应的猝灭速率为2.8 × 1010 s-1。
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 (Φf = 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 × 1010 s-1, while the qu...