Ultrafast laser multihoton-gated reaction of photochromic molecules.

光致变色分子的超快激光多光子门控反应。

• 批准号: 16350012
• 负责人: MIYASAKA Hiroshi
• 金额: $ 10.24万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16350012/
• 关键词: photochromism; laser spectroscopy; multiphoton process; picosecond laser; femtosecond laser; cycloreversion; 非線形過程; レーザーフォトリシス

The instant property change in photochromic systems has been attracting muuch attention not only from the viewpoint of the fundamental chemical reaction processes but also from the application to optoelectronic devices such as rewritable optical memory and switches. Recently, we reported laser-induced enhancement(more than 50 times)of cycloreversion reaction in a photochromic diarylethene derivatives with a low reaction yield under the steady-state light irradiation. The excitation intensity and pulse duration effects of the reaction profiles revealed that higher excited states attained by multiphoton absorption could open the effective photochromic reaction channel. This multiphoton-gated reaction may provide a new approach to erasable memory media with non-destructive readout capability.In order to elucidate the detailed mechanisms and to confirm the generality of the multiphoton-gated cycloreversion reaction, we have investigated the reaction dynamics of various diarylethene derivat … More ives in solutions and in polymer matrices by means of nanosecond, picosecond, and femtosecond pulsed laser excitation. From these results, it was revealed that all of the diarylethene derivatives examined here underwent the multiphoton cycloreversion by picosecond laser pulsed excitation and this reaction also took place in polymer matrices. In addition, direct one photon excitation with two-photon energy of the visible light did not lead to the efficient cycloreversion. This result indicates that the specific excited state regulated by the optical absorption selection rule takes an important role for the efficient reaction to take place.In addition to the picosecond incoherent multiphoton excitation, we have investigated the coherent multiphoton excitation by means of the femtosecond double pulse excitation. As a result of this investigation, we have observed the modulation of the reaction yield dependent on the phase of the low frequency coherent vibrations. The dynamics and mechanisms of multiphoton-gated photochromic reaction were comprehensively discussed. Less

光致变色体系的瞬间性质变化不仅从基本化学反应过程的角度，而且从光致变色在光电子器件如光存储器和光开关中的应用的角度，都引起了人们的广泛关注。最近，我们报道了在稳态光照射下，光致变色二芳基乙烯衍生物的环化反应的激光诱导增强（超过50倍），反应产率低。反应曲线的激发强度和脉冲宽度效应表明，通过多光子吸收获得的高激发态可以打开有效的光致变色反应通道。为了阐明多光子门控环化反应的详细机理并证实其普遍性，我们研究了不同的二芳基乙烯衍生物的反应动力学，并对它们的反应机理进行了讨论。 ...更多信息 通过纳秒、皮秒和飞秒脉冲激光激发，伊韦斯存在于溶液和聚合物基体中。从这些结果中，它被揭示，所有的二芳基乙烯衍生物在这里检查进行多光子cycloreversion由皮秒激光脉冲激发，这种反应也发生在聚合物基体。此外，用可见光的双光子能量直接单光子激发不会导致有效的环化逆转。这一结果表明，受光吸收选择规则调节的特定激发态对反应的有效进行起着重要作用。除了皮秒非相干多光子激发外，我们还研究了飞秒双脉冲激发的相干多光子激发。作为这项调查的结果，我们已经观察到的调制的反应产率依赖于低频相干振动的相位。对多光子门控光致变色反应的动力学和机理进行了较全面的讨论。少

项目成果

Dynamics and Mechanisms of Multiphoton Gated Photochromic Reaction of Diarylethene Derivatives

二芳基乙烯衍生物多光子门控光致变色反应动力学及机理

• 发表时间: 2004
• 期刊: J. Am. Chem. Soc. 126
• 作者: Masataka Murakami;Hiroshi Miyasaka;Tadashi Okada;Seiya Kobatake;Masahiro Irie
• 通讯作者: Masahiro Irie

Picosecond—nanosecond laser photolysis studies of a photoacid generator in solutions: Transient absorption spectroscopy and transient grating measurements

• DOI: 10.1039/b411283k
• 发表时间: 2005-01
• 期刊: Photochemical & Photobiological Sciences
• 影响因子: 3.1
• 作者: Mie Saotome;S. Takano;Asako Tokushima;S. Ito;S. Nakashima;Y. Nagasawa;T. Okada;H. Miyasaka

Picosecond - nanosecond laser photolysis studies of a photoacid generator in solutions : Transient absorption spectroscopy and transient grating.

溶液中光致产酸剂的皮秒-纳秒激光光解研究：瞬态吸收光谱和瞬态光栅。

• 发表时间: 2005
• 期刊: Photochem.Photobiol.Sci. 4巻1号
• 作者: Hirohisa Matsuda;Syoji Ito;Yutaka Nagasawa;Tsuyoshi Asahi;Hiroshi Masuhara;Seiya Kobatake;Masahiro Irie;Hiroshi Miyasaka;H.Matsuda et al.;M.Saotome et al.
• 通讯作者: M.Saotome et al.

"ピコ〜フェムト秒の時間分解測定"実験化学講座 第5版 分光(I)

《皮飞秒时间分辨测量》实验化学课程第五版光谱学（上）

• 发表时间: 2005
• 作者: 長澤 裕;宮坂 博
• 通讯作者: 宮坂 博

Photophysical properties of a carbazolyl mesogen of 8PCzC as revealed by absorption, fluorescence, and transient absorption measurements.

通过吸收、荧光和瞬态吸收测量揭示了 8PCzC 咔唑基介晶的光物理性质。

• 发表时间: 2005
• 期刊: Photochem.Photobiol.Sci. 4[1]
• 作者: J. Harada;et al.;Hildebrand M;K.Irie et al.
• 通讯作者: K.Irie et al.