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Bis(phthalocyaninato)yttrium Grown on Au(111): Electronic Structure of a Single Molecule and the Stability of Two- dimensional Films Investigated by Scanning Tunneling Microscopy/Spectroscopy at 4.8 K

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Nano Research 2010年第8期3卷 604-611页

作者： Yanfeng Zhang Pengfei Guan Hironari Isshiki Mingwei Chen masahiro yamashita Tadahiro Komeda Institute of Multidisciplinary Research for Advanced Materials Tohoku UniversitySendai 980-0877Japan Center for Nanochemistry Academy for Advanced Interdisciplinary StudiesDepartment of Advanced Materials and NanotechnologyCollege of EngineeringBeijing UniversityBeijing 100871China WPI-Advanced Institute for Materials Research Tohoku UniversitySendai 980-8577Japan Department of Chemistry Graduate School of ScienceTohoku UniversitySendai 980-8578Japan CREST Japan Science and Technology Agency(JST)Saitama 332-0012Japan

Scanning tunneling microscopy/spectroscopy(STM/STS)at 4.8 K has been used to examine the growth of a double-decker bis(phthalocyaninato)yttrium(YP_(c2))molecule on a reconstructed Au(111)*** differential conductance spectra(dI/dV)of a single YPc2 molecule allow the characteristics of the highest occupied molecular orbital(HOMO)and the lowest unoccupied molecular orbital(LUMO)to be ***,lateral distributions of the local density of states(LDOS)have also been obtained by dI/dV mapping and confirmed by first principles *** electronic feature mappings and theoretical calculations provide a basis for understanding the unique STM morphology of YPc2,which is usually imaged as an eight-lobed *** addition,we demonstrate that bias-dependent STM morphologies and simultaneous dI/dV maps can provide a way of understanding the stability of two-dimensional YP_(c2) films.

关键词： Scanning tunneling microscopy/spectroscopy(STM/STS) phthalocyanine electronic structure

Magnetic relaxation behavior of a spatially closed dysprosium(Ⅲ) phthalocyaninato double-decker complex

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Science China Chemistry 2012年第6期55卷 918-925,1178-1184页

作者： KATOH Keiichi UMETSU Kaori BREEDLOVE BRIAN K. yamashita masahiro Department of Chemistry Graduate School of Science Tohoku University 6-3 Aramaki-Aza-Aoba Aoba-ku Sendai Miyagi 980-8578 Japan

The SMM properties of the spatially closed Dy（Ⅲ） double-decker Pc complex Dy（obPc）2 （1）, which is equivalent to a pseudo dinuclear complex, are reported. Complex 1 crystallized with ethanol in the crystal lattice in the monoclinic space group P22/n and was isomorphous with Tb（obPc）2 （3）, which is arranged in a dimer structure along the b axis. The intermetallic Dy-Dy distance was determined to be 0.756 nm. ZMT versus T plots for 1 decreased with a decrease in T, which suggests the existence of an antiferromagnetic （AF） interaction between the Dy3＋ ions. The M-H curve for 1 at 1.8 K showed magnetic hysteresis. In ac susceptibility measurements on a powder sample of 1, which were dependent on the applied ac field, indicating that 1 is an single molecule magnet （SMM）, a maximum appeared at 22 K at an ac frequency 09 of 1488 Hz. The shape of the peaks dras- tically changed, and the peaks did not shift when an Hd~ large enough to suppress the quantum tunneling of the magnetization （QTM） was applied. The energy barrier （A/hc） was estimated to be 44 cm-1 with a pre-exponential factor （r0） of 1.6 × 10-5 s from an Arrhenius plot. Our results suggest that the SMM/magnetic properties of 1 significantly change in a dc magnetic field. These relaxation mechanisms are related to the energy gap of the ground state and to QTM.

关键词： single-molecule magnets dysprosium double-decker complex pseudo dinuclear complex magnetic relaxation process

Magnetic relaxation behavior of a spatially closed dysprosium（Ⅲ） phthalocyaninato double-decker complex

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中国科学：化学 2012年第6期42卷 889-890页

作者： Keiichi KATOH Kaori UMETSU BRIAN K. BREEDLOVE masahiro yamashita Department of Chemistry Graduate School of Science Tohoku University 6-3 Aramaki-Aza-Aoba Aoba-ku Sendai Miyagi 980-8578 Japan

The SMM properties of the spatially closed Dy(Ⅲ) double-decker Pc complex Dy(obPc)2(1), which is equivalent to a pseudo dinuclear complex, are reported. Complex 1 crystallized with ethanol in the crystal lattice in the monoclinic space group P21/n and was isomorphous with Tb(obPc)2 (3), which is arranged in a dimer structure along the b axis. The intermetallic Dy-Dy distance was determined to be 0.756 nm. χMT versus T plots for 1 decreased with a decrease in T, which suggests the existence of an antiferromagnetic (AF) interaction between the Dy3+ions. The M-H curve for 1 at 1.8 K showed magnetic hysteresis. In ac susceptibility measurements on a powder sample of 1, which were dependent on the applied ac field, indicating that 1 is an single molecule magnet (SMM), a maximum appeared at 22 K at an ac frequency (f) of 1488 Hz. The shape of the peaks drastically changed, and the peaks did not shift when an Hdclarge enough to suppress the quantum tunneling of the magnetization (QTM) was applied. The energy barrier (Δ/ηχ) was estimated to be 44 cm-1with a pre-exponential factor (τt0) of 1.6 × 10-5s from an Arrhenius plot. Our results suggest that the SMM/magnetic properties of 1 significantly change in a dc magnetic field. These relaxation mechanisms are related to the energy gap of the ground state and to QTM.

关键词：镝(Ⅲ) 空间群弛豫行为封闭磁化率测量酞菁交流电场单分子磁体

Dual-radical-based molecular anisotropy and synergy effect of semi-conductivity and valence tautomerization in a photoswitchable coordination polymer

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National Science Review 2023年第6期10卷 200-214页

作者： Jing-Wei Dai Yu-Qin Li Zhao-Yang Li Hai-Tao Zhang Carmen Herrmann Shohei Kumagai Marko Damjanovi? Markus Enders Hiroyuki Nojiri Masakazu Morimoto Norihisa Hoshino Tomoyuki Akutagawa masahiro yamashita State Key Laboratory of Medicinal Chemical Biology Nankai University School of Materials Science and Engineering Nankai University Institute of Inorganic and Applied Chemistry University of Hamburg Department of Chemistry Graduate School of Science Tohoku University Institute of Inorganic Chemistry University of Heidelberg Institute for Materials Research Tohoku University Department of Chemistry Rikkyo University Institute of Multidisciplinary Research for Advanced Materials (IMRAM) Tohoku University

Organic radicals are widely used as linkers or ligands to synthesize molecular magnetic ***,studies regarding the molecular anisotropies of radical-based magnetic materials and their multifunctionalities are ***,a photoisomerizable diarylethene ligand was used to form{[CoⅢ(3,5-DTSQ·-)(3,5-DTCat2-)]2(6F-DAE-py2)}·3CH3CN·H2O(o-1·3CH3CN·H2O,6F-DAE-py2=1,2-bis(2-methyl-5-(4-pyridyl)-3-thienyl)perfluorocyclopentene),a valence-tautomeric(VT) coordination *** directly observed dual radicals for a single crystal using high-field/-frequency(～13.3 T and～360 GHz) electron paramagnetic resonance(EPR) spectroscopy along the c-axis,which was further confirmed by angle-dependent Q-band EPR ***,a conductive anomaly close to the VT transition temperature was observed only when probes were attached at the ab plane of the single crystal,indicative of synergy between valence tautomerism and *** anisotropy studies and density functional theory(DFT) calculations revealed that this synergy is due to electron transfer associated with valence *** study presents the first example of dual-radical-based molecular anisotropy and charge-transfer-induced conductive anisotropy in a photoswitchable coordination polymer.

关键词： valence tautomerization charge transfer photo switching diradical coordination polymer

Zn Dissolution-Passivation Behavior with ZnO Formation via In Situ Characterizations

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Energy & Environmental Materials 2024年第1期7卷 193-200页

作者： Tanyanyu Wang masahiro Kunimoto masahiro Yanagisawa Masayuki Morita Takeshi Abe Takayuki Homma Graduate School of Advanced Science and Engineering Waseda University1-104 TotsukamachiShinjuku-kuTokyo 169-8050Japan Office of Society-Academia Collaboration for Innovation Kyoto UniversityGokashoUji 611-0011Japan Graduate School of Engineering Kyoto UniversityKyoto daigaku-katsuraNishikyo-kuKyoto 615-8510Japan

In this study,ZnO formation during the dissolution-passivation process of Zn anodes is observed via in situ Raman and optical *** Zn passivation during galvanostatic anodization merely follows the dissolution-precipitation model,whereas that of potentiodynamic polarization exhibits different behaviors in different potential ***,the Zn electrode is gradually covered by a ZnO precipitation film and then undergoes solid-state oxidation at~255 *** starting point of solid-state oxidation is well indicated by the abrupt current drop and yellow coloration of the electrode *** the pseudo passivation,an intense current oscillation is ***,blink-like color changes between yellow and dark blue are revealed for the first time,implying that the oscillation is caused by the dynamic adsorption and desorption of OH *** as-formed ZnOs then experience a dissolution-reformation evolution,during which the crystallinity of the primary ZnO film is improved but the solid-state-formed ZnO layer becomes rich in oxygen ***,oxide densification is realized,contributing to the Zn *** study provides new insights into the Zn dissolution-passivation behavior,which is critical for the future optimization of Zn batteries.

关键词： in situ characterization Zn dissolution and passivation ZnO formation

Next-generation regenerative therapy for ischemic stroke using peripheral blood mononuclear cells

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Neural Regeneration Research 2024年第11期19卷 2341-2342页

作者： Masato Kanazawa Itaru Ninomiya Yutaka Otsu masahiro Hatakeyama Department of Neurology Brain Research InstituteNiigata UniversityNiigataJapan

Stroke is the second leading cause of death and the third leading cause of disability worldwide after heart *** predict that stroke deaths and permanent disabilities will increase worldwide by the year ***-target therapies may be insufficient,because ischemic cerebral injury involves several ***-mediated therapies are ideal,because they target multiple cell types to enhance protection and recovery.

关键词： ischemic death cerebral

A plant growth chamber system equipped with aerosol generators for studying aerosol-vegetation interactions

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Particuology 2024年第2期85卷 122-132页

作者： Masao Gen Seiji Ikawa masahiro Yamaguchi Fong Zyin Lim Takeshi Izuta I.Wuled Lenggoro Graduate School of Bio-Applications and Systems Engineering Tokyo University of Agriculture and TechnologyKoganeiTokyo184-8588Japan Institute of Multidisciplinary Research for Advanced Materials Tohoku UniversitySendai980-8577Japan Faculty of Agriculture Tokyo University of Agriculture and TechnologyFuchuTokyo183-8509Japan Graduate School of Fisheries and Environmental Sciences Nagasaki UniversityNagasaki852-8521Japan Institute of Agriculture Tokyo University of Agriculture and TechnologyFuchuTokyo183-8509 Japan Department of Applied Physics and Chemical Engineering Tokyo University of Agriculture and TechnologyKoganeiTokyo184-8588Japan Institute of Global Innovation Research Tokyo University of Agriculture and TechnologyFuchuTokyo183-8509Japan

Understanding aerosol-vegetation interactions is vital in ***,the interactions remain elusive partly due to the lack of suitable plant growth chamber ***,deposition of submicron particles on leaf surfaces is challenging due to its low deposition velocities compared to larger *** this work,we present a plant-growth chamber that was used to study the effect of sub-micron black carbon(BC)particles on the growth and photosynthesis of *** chamber system simultaneously enables the growth of multiple plants in pots and the deposition of submicron particles onto *** spraying methods assisted by ultrasonic and electrostatic forces were employed as aerosol generators to realize the particle *** flow regime inside the chamber was numeri-cally calculated to predict the transportation of aerosol particles,suggesting the optimal operating conditions of the *** gas-phase particle size distribution measurements showed that gener-ated BC particles were suspended in submicron diameter *** aerosol generators were examined in the chamber using three conductor and insulator substrates as a model of plant *** observations and spectroscopic analysis ascertained that submicron BC particles generated from our generators were deposited on all substrate *** the developed chamber system,systematic studies can be performed to advance the fundamental understanding of aerosol-vegetation interactions.

关键词： Aerosol Exposure chamber Spray drying Black carbon

Endoscopic hemostasis using self-expandable metal stent combinedwith PuraStat® for patient with high risk of post-endoscopicsphincterotomy bleeding (with video)

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Hepatobiliary & Pancreatic Diseases International 2024年第1期23卷 94-96页

作者： Takeshi Ogura Yuki Uba masahiro Yamamura Nobu Nishioka Hiroki Nishikawa 2nd Department of Internal Medicine Osaka Medical and Pharmaceutical UniversityOsakaJapan

To the Editor:Endoscopic sphincterotomy(EST)is an established technique for removal of bile duct stones and self-expandable metal stent(SEMS)***,bleeding can be considered an adverse event after EST,particularly for patients with high risk of bleeding such as those on *** the various techniques reported for obtaining endoscopic hemostasis[1-3].

关键词： bleeding stasis endoscopic

氰基桥联的[Fe4ⅢNi2Ⅱ]六核单分子磁体

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氰基桥联的[Fe4ⅢNi2Ⅱ]六核单分子磁体