Excited State Dynamics for Visible Light Sensitization of Fast Photochromic Phenoxyl-Imidazolyl Radical Complex with Aryl Ketone
Excited State Dynamics for Visible Light Sensitization of Fast Photochromic Phenoxyl-Imidazolyl Radical Complex with Aryl Ketone
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DOI：
10.3762/bxiv.2019.46.v1
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发表时间：
2019-06
期刊：
影响因子：
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通讯作者：
Yoichi Kobayashi;Yukie Mamiya;Katsuya Mutoh;Hikaru Sotome;Masafumi Koga;H. Miyasaka;J. Abe
中科院分区：
文献类型：
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作者：
Yoichi Kobayashi;Yukie Mamiya;Katsuya Mutoh;Hikaru Sotome;Masafumi Koga;H. Miyasaka;J. Abe
可见光敏化光开关由于其长波长光可以减少光降解、深入物质内部、实现凝聚体系中的选择性激发等优点，在生命科学和材料科学领域受到了特别的关注，在各种光开关分子中，菲咯啉-咪唑基自由基配合物（PIC）是近年来发展起来的一种热致发光材料，可逆光致变色分子，其热逆反应可通过分子结构的合理设计从几十纳秒调节到几十秒。虽然PIC的开关速度的宽范围的可调谐性开辟了各种潜在的应用，但对可见光没有光敏性限制了其应用。在本研究中，我们合成了一个可见光敏化的PIC衍生物共轭苯偶酰单元。飞秒瞬态吸收光谱表明，苯偶酰单元作为单重态光敏剂的PIC的德克斯特型能量转移。PIC的可见光敏化光致变色反应对于拓展其在生命科学和材料科学中的潜在应用具有重要意义。
Visible light sensitized photoswitches have been paid particular attention in the fields of life science and materials science because long-wavelength light reduces photodegradation, transmits deep inside of matters, and achieves the selective excitation in condensed systems.Among various photoswitch molecules, phenoxyl-imidazolyl radical complex (PIC) is a recently developed thermally-reversible photochromic molecule whose thermal back reaction can be tuned from tens of nanoseconds to tens of seconds by rational designs of the molecular structure. While the wide range of tunability of the switching speed of PIC opened up various potential applications, no photosensitivity to visible light limits its applications. In this study, we synthesized a visible light sensitized PIC derivative conjugated with a benzil unit. Femtosecond transient absorption spectroscopy revealed that the benzil unit acts as a singlet photosensitizer for PIC by the Dexter-type energy transfer. Visible light sensitized photochromic reactions of PIC are important for expanding the versatility of potential applications to life science and material science.