Publications by authors named "Masako Kato"

Article Synopsis
  • The research involves creating trigonal planar Cu(I) iodide complexes using specific disilane ligands and studying how methyl group positions on the pyridine ring impact their structure and properties.
  • Characterization methods included NMR, elemental analysis, and X-ray diffraction, revealing different conformations of ligand coordination with Cu(I) that affected emission colors—blue-green for one complex and green-yellow for another.
  • The complexes demonstrated significant light emission properties, with high quantum yields and thermally activated delayed fluorescence at room temperature, showing unique optical behaviors analyzed through advanced computational methods.
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Objective: Reports demonstrating the effectiveness and safety of strut-adjusted volume implants (SAVI) in Japan are limited. Therefore, this study aimed to compare the treatment outcomes of SAVI and whole-breast irradiation (WBI) at a single facility.

Materials And Methods: Data were retrospectively extracted from the medical records of patients treated with SAVI or WBI following partial mastectomy (Bp).

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Article Synopsis
  • - The self-assembly of d transition metal complexes like Pt(ii) and Pd(ii) is crucial for creating advanced materials used in optoelectronics and sensing, but understanding their electronic behaviors when excited is still unclear.
  • - This study compares the excited-state behavior of self-assembled Pt(ii) and Pd(ii) complexes, revealing that while both have similar structures, their thermal responses differ significantly.
  • - The Pt(ii) complex displays a dramatic thermochromic luminescence shift when heated, while the Pd(ii) complex shows increased luminescence efficiency when cooled, highlighting their contrasting properties.
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The development of Zn-based phosphorescent materials, associated with a ligand-centered (LC) transition, is extremely limited. Herein, we demonstrated dual emissions including fluorescence and phosphorescence in luminescent tetranuclear Zn(II) clusters [ZnL(μ-OMe)X] ( = methyl-5-iode-3-methoxysalicylate; X = I, Br, Cl), incorporating iodine-substituted ligands. Single-crystal X-ray structural analyses and variable-temperature emission spectra studies revealed the presence of iodine substitutions, and intermolecular halogen interactions produced the internal/external heavy-atom effects and yielded strong green phosphorescence with a long emission lifetime (λ = 510-522 nm, Φ = 0.

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Platinum(II) complexes of square-planar geometry are interesting from a crystal engineering viewpoint because they exhibit strong luminescence based on the self-assembly of molecular units. The luminescence color changes in response to gentle stimuli, such as vapor exposure or weak mechanical forces. Both the molecular and the crystal designs for soft crystals are critical to effectively generate the chromic luminescence phenomenon of Pt(II) complexes.

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Porous molecular crystals (PMCs) have gained significant importance as next-generation functional porous materials. However, the selective crystallisation of the PMC phase remains a challenge. Herein, we have systematically controlled the stability of the luminescent PMC phase prepared using the luminescent Pt(II) complex [Pt(pbim)(N^O)] (pbim = 2-phenylbenzimidazolate, N^O = N-heteroaryl carboxylate) with Pt⋯Pt electronic interactions.

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A coordination polymer, [Cu(SCN)(iqi)] (iqi = isoquinoline), containing copper(I) thiocyanate and a nitrogen-containing π-conjugated ligand, iqi, has been synthesized and its physical properties were evaluated. This coordination polymer has a two-dimensional (2D) sheet structure consisting of copper(I) thiocyanate and shows photoluminescence derived from MLCT and photoconductive properties.

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Invited for the cover of this issue is the group of Masaki Yoshida and Masako Kato at Hokkaido University/Kwansei Gakuin University. The image depicts the changes in the assembly of Pt complexes with humidity on layered double hydroxide (LDH) nanoparticles, resulting in a drastic emission color change from green to orange. Read the full text of the article at 10.

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Controlled self-assembly of Pt complexes is key to the development of optical and stimuli-responsive materials, but designing and precisely controlling them is still difficult owing to weak intermolecular interactions. Herein, we report the successful water-vapor-induced assembly of an anionic Pt complex [Pt(CN) (ppy)] (Hppy=2-phenylpyridine) electrostatically loaded onto cationically charged layered double hydroxide (LDH) nanoparticles consisting of Mg and Al ions. When the Pt complexes were densely loaded onto the LDH nanoparticles, the assembly was maintained, even in dilute aqueous media.

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Dye-sensitized H evolution photocatalysts have attracted considerable attention as promising systems for the photochemical generation of H from water. In this study, to mimic the reaction field of natural photosynthesis artificially, we synthesized a hydrophobic Ru(II) dye-sensitized Pt-TiO nanoparticle photocatalyst, @Pt-TiO ( = [Ru(dCbpy)(Hdmpbpy)]; dCbpy = 4,4'-dinonyl-2,2'-bipyridine, Hdmpbpy = 4,4'-dimethyl phosphonic acid-2,2'-bipyridine), and integrated it into 1,2-dipalmitoyl--glycero-3-phosphocholine (DPPC) lipid bilayer vesicle membranes. The photocatalytic H production activity in 0.

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A series of Pt(II) complexes bearing N-heterocyclic carbenes, [Pt(CN)(Rim-Mepy)] (Rim-MepyH = 3-alkyl-1-(4-methyl-(2-pyridinyl))-1-imidazolium, R = Me, Et, Pr, or Bu), exhibits triboluminescence in the visible range from blue to red, as well as the corresponding intense photoluminescence. Remarkably, among the complexes, the Pr-substituted one exhibits chromic triboluminescence behaviour during the process of rubbing and also vapour exposure.

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A thermoresponsive structural change based on a disilane-bridged bis(pyridine) ligand and CuI is reported. Single-crystal X-ray analysis revealed that there are two polymorphs in the Cu(I) complex: octanuclear copper(I) complex at 20 °C and 1D staircase copper(I) polymer complex at -173 °C. The formation of these polymorphs is due to the flexibility of the ligand.

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Aims: To investigate the factors that contribute to subjective quality of life (QOL) in adolescents with cerebral palsy (CP).

Methods: We evaluated the subjective QOL in 51 adolescents with CP through interviews using the Japanese version of KIDSCREEN-27 (J-KIDSCREEN-27) and compared the scores with those of 60 typically developing adolescents. Correlations of subjective QOL with age, sex, the levels of functions (gross motor, manipulation, and communication), intelligence, the level of activity of daily living (ADL), and the type of educational support were examined.

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Molecular crystals of Pt(II) complexes with metallophilic interactions can provide bright assembly-induced luminescence with colour tunability. However, the brittleness of many of these crystals makes their application in flexible optical materials difficult. Herein, we have achieved the elastic deformation of crystals of polyhalogenated Pt(II) complexes exhibiting bright assembly-induced luminescence.

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Article Synopsis
  • The study aimed to assess how long patients with painful bone metastases experienced relief after palliative radiotherapy and when new pain would begin, especially focusing on low-risk asymptomatic bone metastasis (LRABM).
  • A total of 132 patients (average age 66) were monitored for pain before and after treatment, with 86% achieving pain relief, but a significant number (70%) experienced pain progression within an average of 75 days after radiation.
  • The research indicated that women and those with certain types of metastases (like pelvic or spinal) were more likely to experience pain onset within a year, particularly at LRABM sites, where the average time to new pain was only
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Visible-luminescent lanthanide (Ln) complexes with a highly planar tetradentate ligand were successfully developed for a visible-light solid-state excitation system. was designed by using two 2-hydroxy-3-(2-pyridinyl)-benzaldehyde molecules bridged by ethylenediamine, which was then coordinated to a series of Ln ions (Ln = Nd, Sm, Eu, Gd, Tb, Dy, and Yb). From the measurement of single-crystal X-ray analysis of Eu, two phenolic O atoms and two imine N atoms in were coordinated to the Eu ion, and each π-electronic system took coplanar with the edged-pyridine moiety through an intramolecular hydrogen bond.

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Vapochromic materials that exhibit color/luminescence changes induced by vapor exposure have attracted considerable attention. Herein, we report the grinding- and heating-induced ON-OFF switching of the vapochromic behavior of [Pt(ppyCl)(Clacac)] (; ppyCl = 2-(3-chlorophenyl)-4-chloropyridinato, Clacac = 3-chloroacetylacetonato). formed yellow and orange polymorphs ( and ), and could be converted to , which showed a very similar crystal structure but with a broadened X-ray diffraction pattern compared with that of .

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Vapochromic crystals of Ni(II)-quinonoid complexes were theoretically investigated using density functional theory (DFT) calculations. Kato et al. previously reported that the purple crystals of a four-coordinate Ni(II)-quinonoid complex () exhibited vapochromic characteristics upon exposure to methanol gas, resulting in orange crystals of the six-coordinate methanol-bound complex () [, , 2345-2349].

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To develop highly active H evolving dye-sensitized photocatalysts (DSPs) applicable for Z-scheme water splitting, we synthesized a series of Ru(II)-dye-double-layered DSPs, X'--Zr-@Pt-TiO () with different surface-bound metal cations (X' = Fe, Y, Zr, Hf, and Bi). In 0.5 M KI aqueous solution, the photocatalytic H evolution activity under blue light irradiation (λ = 460 ± 15 nm) increased in the following order: nonmetal-modified DSP, (turn over number for 6 h irradiation = 35.

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A series of σ-π extended octamethyltetrasilanes, which have phenothiazine, 9,9-dimethyl-9,10-dihydroacridine, or phenoxazine (, , and ) groups as donor moieties and thienopyrazine or benzothiadiazole ( and ) groups as acceptor fragments, has been prepared, and their optical properties have been studied as an extension of our work. All six compounds exhibited fluorescence in the solid state with maximum wavelengths centered in the range of 400 and 650 nm upon excitation by a UV lamp. Compound showed apparent dual emission behavior in solution, which depends on solvent polarity, and a reversible photoluminescent change under mechanical and thermal stimuli in the solid state.

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Article Synopsis
  • A complex made of one [Re(CO)] unit and a phthalocyanine (Pc) ligand (Re Pc) acts as a photo-induced CO-releasing molecule (photoCORM) when exposed to red light and oxygen in a suitable solvent.
  • Rapid absorption spectroscopy shows that Re Pc has very short excited-state lifetimes and quick transitions between energy states due to its unique structure.
  • This research highlights Re Pc's potential for red-light-driven applications in biological settings or therapeutics, making it a promising candidate for future studies.
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Artificial intelligence algorithms utilizing deep learning are helpful tools for diagnostic imaging. A deep learning-based automatic detection algorithm was developed for rib fractures on computed tomography (CT) images of high-energy trauma patients. In this study, the clinical effectiveness of this algorithm was evaluated.

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The vapochromic single-crystal-to-single-crystal (SCSC) transformation of a highly luminescent Pt complex bearing an N-heterocyclic carbene [Pt(CN) (tBu-impy)] (tBu-impyH =1-tert-butyl-3-(2-pyridyl)-1H-imidazolium) is reported. The trihydrate form of the complex, which exhibits blue MMLCT emission owing to weak Pt⋅⋅⋅Pt interactions, changed its luminescence color from blue to yellowish-green upon the desorption of water molecules while keeping the high emission quantum yield of more than 0.45.

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We synthesized new oxygen-evolving molecular Ru(II) catalysts with one or two carbazole moieties on the axial pyridyl ligands, namely [Ru(bda)(cbz-py)(py)] and [Ru(bda)(cbz-py)] [C1 and C2; bdaH = 2,2'-bipyridyl-6,6'-dicarboxylic acid, py = pyridine, and cbz-py = 9-(pyridin-4-yl)-9-carbazole] to investigate the effect of cbz modification on the photophysical and catalytic properties of the well-known molecular catalyst [Ru(bda)(py)] (C0). The initial oxygen-evolving catalytic activities of C1 and C2 were higher than that of C0 in both a chemical reaction driven by the strong oxidant (NH)[Ce(NO)] (CAN = ceric ammonium nitrate) and photochemical oxidation using a [Ru(bpy)] (bpy = 2,2'-bipyridine) photosensitizer with NaSO as the sacrificial oxidant. The higher activities were ascribed to the electron-withdrawing cbz groups, which promoted the radical coupling reaction to form a Ru-O-O-Ru species.

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