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Главная страница Новости науки Journal of Photochemistry and Photobiology C: Photochemistry Reviews
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ScienceDirect Publication: Journal of Photochemistry and Photobiology C: Photochemistry Reviews
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ScienceDirect Publication: Journal of Photochemistry and Photobiology C: Photochemistry Reviews
  • IFC(EDITORIAL BOARD)
    Publication date: March 2017
    Source:Journal of Photochemistry and Photobiology C: Photochemistry Reviews, Volume 30











  • Searching for facet-dependent photoactivity of shape-controlled anatase TiO2
    Publication date: September 2016
    Source:Journal of Photochemistry and Photobiology C: Photochemistry Reviews, Volume 28

    Author(s): Michela Maisano, Maria Vittoria Dozzi, Elena Selli

    Improving the performance of mostly employed anatase TiO2 photocatalysts by properly controlling their crystal shape represents a big challenge to improve their efficiency in photocatalytic applications. After the synthesis, reported in 2008, of anatase microcrystals enriched in high-energy {001} facets, many efforts have been made aimed at tuning the crystal morphology of anatase, by means of either fluorine-mediated or more environmentally friendly methods, producing a deviation from its regular crystal growth. In this relatively new field of investigation, controversial opinions emerged concerning the role of each type of facet and its relative amount in relation to photoefficiency optimization. This review addresses this topic by presenting a critical survey of selected literature reports. After a brief introduction on the main synthetic strategies adopted to obtain shape-controlled anatase photocatalysts, the attention is focused on the methods employed for their comprehensive characterization, including the identification and quantification of exposed facets and the assessment of their influence on bulk and surface properties relevant to photoactivity. Potential interferences, derived from synthetic routes and possibly affecting the conclusions of facet-dependent photoactivity investigations, are also discussed. Key examples of test reactions actually demonstrating how both the type and/or the amount of specific facets influence photocatalytic activity are finally reported, aiming at providing rational bases for the design of better performing shape-controlled anatase photocatalysts.







  • Reaction dynamics of excited radical ions revealed by femtosecond laser flash photolysis
    Publication date: June 2018
    Source:Journal of Photochemistry and Photobiology C: Photochemistry Reviews, Volume 35

    Author(s): Mamoru Fujitsuka, Tetsuro Majima

    Herein, we review studies on the dynamics of excited radical ions. The enhanced reactivities of excited radical ions are recognized by many researchers based on product analysis studies conducted around 1980. For cases involving fluorescent excited radical ions, lifetime measurements provide information on excited states, and they sometimes lead to confusion owing to emissive byproducts resulting from their higher reactivities. Nanosecond laser flash photolysis studies provide evidence of the reactions of excited radical ions, and analyses of their kinetics reveal properties such as their excited-state lifetimes despite an indirect manner. Recent femtosecond laser flash photolysis studies provide detailed pictures of excited radical ions, though such studies are few. Furthermore, studies on dyad or triad systems, including excited radical ions, show electron transfer dynamics and disclose characteristics of excited radical ions that differ from those in neutral states. Larger electronic coupling and smaller dumping factor are reported as important characteristics of electron transfer systems of excited radical ions. These systematic studies on excited radical ions demonstrate their suitability for applications.

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  • IFC(EDITORIAL BOARD)
    Publication date: December 2016
    Source:Journal of Photochemistry and Photobiology C: Photochemistry Reviews, Volume 29











  • Photoresponsive supramolecular self-assemblies at the liquid/solid interface
    Publication date: Available online 30 December 2017
    Source:Journal of Photochemistry and Photobiology C: Photochemistry Reviews

    Author(s): Denis Frath, Soichi Yokoyama, Takashi Hirose, Kenji Matsuda

    Control over molecular nanostructure is of the utmost importance in bottom-up strategies to create functionalized surfaces for electronic devices and advanced materials. In this context, the study of two-dimensional self-assembled structures consisting of organic molecules on surfaces using scanning tunneling microscopy (STM) has been the subject of intensive research. The formation of stimuli-responsive assemblies, especially photoresponsive ones, on surfaces is attracting interest. Meanwhile, assemblies formed at the liquid/solid interface have been extensively studied using STM from a supramolecular chemistry perspective in order to understand the assembly process of the molecules from the solution phase to the substrate interface. In this review, an overview of advances in photoresponsive supramolecular self-assemblies formed at the liquid/solid interface is given. Recent progress in the analysis of the adsorption process using the nucleation–elongation model of two-dimensional self-assembly will be featured and discussed in the context of photochemical control of the assembly.

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  • Solar energy conversion: From natural to artificial photosynthesis
    Publication date: June 2017
    Source:Journal of Photochemistry and Photobiology C: Photochemistry Reviews, Volume 31

    Author(s): Mohamed E. El-Khouly, Eithar El-Mohsnawy, Shunichi Fukuzumi

    Solar energy has a great potential as a clean, cheap, renewable and sustainable energy source, but it must be captured and transformed into useful forms of energy as plants do. An especially attractive approach is to store solar energy in the form of chemical bonds as performed in natural photosynthesis. Therefore, there is a challenge in the last decades to construct semi-artificial and artificial photosynthetic systems, which are able to efficiently capture and convert solar energy and then store it in the form of chemical bonds of solar fuels such as hydrogen or hydrogen peroxide, while at the time producing oxygen from water. Here, we review the molecular level details of the natural photosynthesis, particularly the mechanism of light dependent reactions in oxygen evolving organisms, absorption efficiency of solar energy and direct energy production. We then demonstrate the concept and examples of the semi-artificial photosynthesis in vitro. Finally we demonstrate the artificial photosynthesis, which is composed of light harvesting and charge-separation units together with catalytic units of water oxidation and reduction as well as CO2 reduction. The reported photosynthetic molecular and supramolecular systems have been designed and examined in order to mimic functions of the antenna-reaction center of the natural process. The relations between structures and photochemical behaviors of these artificial photosynthetic systems are discussed in relation to the rates and efficiencies of charge-separation and charge-recombination processes by utilizing the laser flash photolysis technique, as well as other complementary techniques. Finally the photocatalytic production of hydrogen peroxide as a more promising solar fuel is discussed in relation with the natural photosynthesis, which also produces hydrogen peroxide in addition to NADPH.

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  • Stepwise two-photon absorption processes utilizing photochromic reactions
    Publication date: Available online 25 December 2017
    Source:Journal of Photochemistry and Photobiology C: Photochemistry Reviews

    Author(s): Yoichi Kobayashi, Katsuya Mutoh, Jiro Abe

    Stepwise two-photon absorption (2PA) is one of the nonlinear photoresponses where two photons are sequentially absorbed to proceed a photophysical or photochemical reaction. The stepwise 2PA can selectively produce a higher excited state with relatively high spatial selectivity, and therefore, it can be an efficient tool to explore and realize nonlinear photoresponsive materials beyond Kasha’s rule. Moreover, if a photogenerated chemical species is used as an intermediate state of the stepwise 2PA, the power threshold to promote the stepwise 2PA can be greatly reduced compared with that of a simultaneous 2PA, and conventional LEDs and even sunlight could be used to induce the stepwise 2PA. Because of these advantages, the stepwise 2PA has been widely studied more than a half century ago not only for fundamental physics and chemistry but also for applications to optical memory, holography, and artificial photosynthesis. In this review, we overview various types of stepwise 2PA processes from the viewpoints of history, fundamentals, and applications. Especially we focus on the stepwise 2PA processes related to photochromic reactions because the combination of photochromic reactions and stepwise 2PA processes has realized various potentially-applicable nonlinear photoresponsive materials and found several anomalous phenomena beyond the one-photon photophysical and photochemical reactions. The stepwise 2PA processes are mainly divided into two categories involving an electronic excited state or a photogenerated transient species as the intermediates states of the stepwise 2PA. These two types of the stepwise 2PAs are explained respectively, and finally, the summary and outlook are presented.

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  • Targetable fluorescent sensors for advanced cell function analysis
    Publication date: March 2017
    Source:Journal of Photochemistry and Photobiology C: Photochemistry Reviews, Volume 30

    Author(s): Shin Mizukami

    Chemistry-based bioimaging techniques have contributed to the elucidation of intracellular physiological events. During the last few decades, many fluorescent sensors have been developed and used in live cell experiments. Owing to immense efforts by numerous research groups, several strategies have been developed to design fluorescent sensors based on various components such as small molecules and fluorescent proteins. Recently, site-specific targeting of fluorescent sensors has attracted increasing attention. Strategies for fluorescent sensor targeting were surveyed in this review with the aims to expand current knowledge on chemistry-based bioimaging and aid in the emergence of related innovative technologies. The first discussed strategy is based on the intrinsic properties of small molecules for localization at specific organelles, such as mitochondria, nuclei, and lysosomes. As a further elaboration of the topic, our recent study about in vivo targeting of pH sensors was briefly introduced. The second strategy exploits genetically encoded tags and their specific ligands. Here, fluorescent sensors with commercially available tags and corresponding ligands were mainly reviewed. As the final topic, our original protein labeling technique, which enables fluorogenic labeling as an advanced technology, was introduced.







  • Recent Development on MoS2-based Photocatalysis: a Review
    Publication date: Available online 25 December 2017
    Source:Journal of Photochemistry and Photobiology C: Photochemistry Reviews

    Author(s): Zizhen Li, Xiangchao Meng, Zisheng Zhang

    MoS2-based photocatalysts attract wide attention as they possess a suitable band gap for visible-light harvesting, making it a promising earth-abundant photocatalyst for hydrogen production, environmental remediation, and photosynthesis. However, the rapid recombination of photogenerated electron-hole pairs, limited quantity of active edge sites, and difficult photocatalyst separation and recycling hinder the practical application of this material. In this review, recent development of MoS2-based photocatalysts in various photocatalytic applications is summarized. In addition, possible approaches to enhance photocatalytic activity and separate photocatalysts from reaction media are discussed to provide a future direction in highly efficient photocatalyst design.

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  • Phenomenon to functions: Photochromism of diarylpyrans, spectrokinetic properties and functional materials
    Publication date: December 2016
    Source:Journal of Photochemistry and Photobiology C: Photochemistry Reviews, Volume 29

    Author(s): Arindam Mukhopadhyay, Jarugu Narasimha Moorthy

    Diarylbenzo- and naphthopyrans are one of the important and well-known classses of organic photochromic systems. Their photolysis leads to highly colored o-quinonoid intermediates. The mechanistic details and spectrokinectic properties of the photogenerated colored intermediates have been extensively studied. Accordingly, stereoelectronic effects have been shown to play a crucial role in controlling properties such as spectrokinetics, fatigue resistance and colorability. Much research continues unabated to develop photochromic materials with properties that surpass the existing ones for application in ophthalmic lenses as well as optical data storage devices. In the realm of materials chemistry, the diarylpyran unit is presently exploited as an essential design element to produce functional materials. Given the facile synthetic access to molecular systems that respond to light as an external stimulus leading to widely distinct physicochemical properties, we believe that more exciting research based on diarylpyran photochemistry will germinate in materials chemistry and biology in the near future. This review with a coverage of the phenomenon since its inception to the present state of application for functional materials–through synthesis and mechanistic details–should serve as an invaluable resource to an uninhibited chemist to exploit the photochromism of diarylpyrans for diverse functions/applications.

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