Tsukasa Takanashi

Excitation-wavelength- and protonation-dependent multiple photoreaction pathways in TAT rhodopsin from femtoseconds to seconds

Korenobu Matsuzaki, Chun-Fu Chang, Masae Konno, Teppei Sugimoto et autres

TAT rhodopsin is a member of the microbial rhodopsin family, a large group of seven-transmembrane photoreceptive proteins that bind an all-trans-retinal chromophore. While the Schiff-base linkage between the retinal and the protein moiety is protonated in most microbial rhodopsins, it is partially …

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Allosteric Chiral Recognition of Eu(III) Complex for Chiral Co(III) Complex Observed by Time‐Resolved Circularly Polarized Luminescence Spectroscopy

Juri Yamashita, Munetaka Iwamura, Tsukasa Takanashi, Koichi Nozaki et autres

Steady‐state and time‐resolved circularly polarized luminescence (CPL) are investigated for aqueous solutions of [Eu(pda) 2 ] − (pda = 1,10‐phenanthroline‐2, 9‐dicarboxylic acid) containing Δ/Λ‐[Co(en) 3 ] 3+ (en = ethylenediamine). CPL signals (| g lum | ≈ 0.2 at maximum) are observed …

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(Invited) Double Hydrogen Atom Transfer Strategy for Catalytic Acceptorless Dehydrogenation of Cycloalkanes

Harunobu Mitsunuma, Rahul A. Jagtap, Yuki Nishioka, Stephen M. Geddis et autres

The development of efficient hydrogen release technology from liquid organic hydrogen carriers (LOHCs), such as cyclohexane and methylcyclohexane (MCH), is pivotal for establishing a hydrogen-based society. However, achieving homogeneous catalytic acceptorless dehydrogenation (CAD) with high selectivity for complete aromatization under mild conditions …

Catalytic acceptorless complete dehydrogenation of cycloalkanes

Rahul A. Jagtap, Yuki Nishioka, Stephen M. Geddis, Yu Irie et autres

The advancement of an effective hydrogen liberation technology from liquid organic hydrogen carriers, particularly cycloalkanes such as cyclohexane and methylcyclohexane, holds significance in realizing a hydrogen-centric society. However, the attainment of homogeneous catalytic acceptorless dehydrogenation characterized by elevated selectivity for thorough aromatization …

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Torsional Structural Relaxation Caused by Pt–Pt Bond Formation in the Photoexcited Dimer of Pt(II) N C N Complex in Solution

Honoka Watanabe, Munetaka Iwamura, Koichi Nozaki, Tsukasa Takanashi et autres

[Pt(NCN)MeCN] + (NCN = 1,3-di(2-pyridyl)benzene, MeCN = acetonitrile) forms oligomers in the ground state due to metallophilic interactions, and a Pt–Pt bond is formed with photoexcitation. Ultrafast excited-state dynamics of the [Pt(NCN)MeCN] + dimer in acetonitrile is investigated by femtosecond time-resolved absorption …

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Ultrafast charge-transfer dynamics in a visible-light-excited iridium(III) terpyridine 2-phenylpyridine complex studied by femtosecond X-ray absorption spectroscopy

Ken‐ichi Yamanaka, Kosuke Sato, Shunsuke Sato, Shunsuke Nozawa et autres

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Resonant X-ray emission spectroscopy from broadband stochastic pulses at an X-ray free electron laser

Franklin D. Fuller, Anton D. Loukianov, Tsukasa Takanashi, Daehyun You et autres

Hard X-ray spectroscopy is an element specific probe of electronic state, but signals are weak and require intense light to study low concentration samples. Free electron laser facilities offer the highest intensity X-rays of any available light source. The light produced at …

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Formative period in the x-ray-induced photodissociation of organic molecules

Edwin Kukk, H. Fukuzawa, Johannes Niskanen, Kiyonobu Nagaya et autres

The authors combine x-ray free electron laser pulses and infrared laser pulses to characterize the femtosecond-scale electronic relaxation, ring opening and fragmentation processes on a thiophene molecule.

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Suppression of thermal nanoplasma emission in clusters strongly ionized by hard x-rays

Yoshiaki Kumagai, Zoltán Jurek, Weiqing Xu, Vikrant Saxena et autres

Abstract Using electron and ion spectroscopy, we studied the electron and nuclear dynamics in ∼50 000-atom large krypton clusters, following excitation with an intense hard x-ray pulse. Beyond the single pulse experiment, we also present the results of a time-resolved, x-ray pump–near-infrared …

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Comparative Studies of the Fluorescence Properties of Microbial Rhodopsins: Spontaneous Emission Versus Photointermediate Fluorescence

Keiichi Kojima, Rika Kurihara, Masayuki Sakamoto, Tsukasa Takanashi et autres

Abstract Rhodopsins are seven-transmembrane photoreceptor proteins that bind to the retinal chromophore and have been utilized as a genetically encoded voltage indicator (GEVI). So far, archaerhodopsin-3 (AR3) has been successfully used as a GEVI, despite its low fluorescence intensity. We performed comparative …

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Characterizing crystalline defects in single nanoparticles from angular correlations of single-shot diffracted X-rays

Akinobu Niozu, Yoshiaki Kumagai, Toshiyuki Nishiyama, H. Fukuzawa et autres

Characterizing and controlling the uniformity of nanoparticles is crucial for their application in science and technology because crystalline defects in the nanoparticles strongly affect their unique properties. Recently, ultra-short and ultra-bright X-ray pulses provided by X-ray free-electron lasers (XFELs) opened up the …

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Characterizing crystalline defects in single Xe nanoparticles from angular correlations of single-shot diffracted X-rays

Akinobu Niozu, Yoshiaki Kumagai, Toshiyuki Nishiyama, H. Fukuzawa et autres

Synopsis We performed a wide-angle X-ray scattering experiment of single Xe nanoparticles using an X-ray free electron laser. We developed a novel analysis method that focuses on the angular correlation between plural Bragg spots in single-shot diffraction patterns. The angular correlations of …

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