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51.
Kusama H Ishida K Funami H Iwasawa N 《Angewandte Chemie (International ed. in English)》2008,47(26):4903-4905
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Ishii K Shiine M Shimizu Y Hoshino S Abe H Sogawa K Kobayashi N 《The journal of physical chemistry. B》2008,112(10):3138-3143
In this study, we have investigated the photochemical properties and photodynamic effects of ruthenium phthalocyanine (RuPc(CO)(Py)) and naphthalocyanine (RuNc(CO)(Py)) complexes. When a nanosecond-pulsed laser is used, the photodecarbonylation of our Ru complexes efficiently proceeds via stepwise two-photon excitation, while the reaction yields are negligibly small when a continuous-wave (CW) laser is employed. The pulsed laser selective photodecarbonylation decreases the Q-band absorbance, which satisfies what the photodynamic therapy (PDT) requires of the photobleaching. For RuPc(CO)(Py), the photochemical reactions including both the photodecarbonylation and just photobleaching occur in HeLa cells in vitro. Toxicity and phototoxicity tests indicate that our RuPc(CO)(Py) and RuNc(CO)(Py) complexes in concentrations of 0.3-1 microM and 1-2 microM, respectively, are applicable as PDT agents. The phototoxicity is consistent with the photochemical properties of these complexes, namely, excited triplet lifetimes (10 and 4.8 micros for the Pc and Nc complexes, respectively) and singlet oxygen yields (0.48 and 0.35 for the Pc and Nc complexes, respectively). On the basis of these results, we propose a novel concept for achieving a greater depth of necrosis in PDT as follows: (1) PDT of upper cellular layers using CW-laser irradiation; (2) efficient photobleaching in upper cellular layers using pulsed dye-laser irradiation, which results in an increase in the therapeutic depth of red light; (3) PDT directed toward deeper tumor tissues using CW laser irradiation. In addition, these Ru complexes are promising as CO release agents for investigative biochemistry. 相似文献
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Onouchi H Okoshi K Kajitani T Sakurai S Nagai K Kumaki J Onitsuka K Yashima E 《Journal of the American Chemical Society》2008,130(1):229-236
Rodlike polymers with precisely defined architectures are ideal building blocks for self-assembled structures leading to novel nanometer-scale devices. We found that the living polymerization of a single isocyanide enantiomer bearing an l-alanine pendant with a long n-decyl chain simultaneously produced diastereomeric right- and left-handed helices with different molecular weights and narrow molecular weight distributions. Each single-handed, rodlike helical polymer with a controlled length and handedness isolated by a facile solvent fractionation method with acetone self-assembled to form well-defined two- and three-dimensional smectic ordering on the nanometer scale on a substrate and in a liquid crystalline state as evidenced by direct atomic force microscopic observations and X-ray diffraction measurements, respectively. 相似文献
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Koji Yamamoto Riku Nameki Hiromitsu Sogawa Toshikazu Takata 《Angewandte Chemie (International ed. in English)》2020,59(41):18023-18028
A dinuclear PdII complex possessing a cyclic ligand was developed as a novel doubly threaded [3]rotaxane scaffold and applied as a rotaxane cross‐linker reagent. The dinuclear complex (PdMC)2 was prepared by one‐step macrocyclization followed by the double palladation reaction. 1H NMR analysis and UV/Vis measurements revealed the formation of a doubly threaded pseudo[3]rotaxane by the complexation of (PdMC)2 with 2 equivalents of 2,6‐disubstituted pyridine 3 through double metal coordination. The treatment of (PdMC)2 with 2 equivalents of 4‐vinylpyridine (VP) afforded a doubly threaded [3]rotaxane cross‐linker (PdMC‐VP)2 . Radical co‐polymerization of VP and t‐butylstyrene in the presence of (PdMC‐VP)2 afforded a stable rotaxane cross‐linked polymer (RCP). An elastic RCP was also prepared by using n‐butyl acrylate as a monomer. The obtained RCPs exhibited higher swelling ability and higher mechanical toughness compared with the corresponding covalent cross‐linked polymers. 相似文献
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Masayuki Kirihara Satoshi SuzukiYuki Ishizuka Kento YamazakiRyoji Matsushima Takaya SuzukiToshiaki Iwai 《Tetrahedron letters》2013
The reaction of dithioacetals with 30% hydrogen peroxide in the presence of catalytic amounts of iron(III) acetylacetonate and sodium iodide efficiently produced the corresponding carbonyl compounds in high yields. 相似文献
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Shinpei Okuda Naoyuki Kimura Minoru Takeda Tsutomu Inoue Kento Aizawa 《Optical Review》2014,21(5):560-562
We designed and fabricated a spiral plasmonic lens (PL) with multi-circular grooves to increase light intensity in a farfield region via the constructive interference of the light scattered by the multi-circular grooves. To compare the beam focusing characteristics of a spiral PL with multi-circular grooves with those of a conventional spiral PL, we simulated the electric field distribution of the PLs operating at a 405 nm wavelength. We confirmed that the light intensity increased about twofold at 0.75 μm above the PL surface owing to the effect of the multi-circular grooves. Furthermore, the circular grooves negligibly affect the full width at half-maximum of the focal spot, keeping the subwavelength size (~200 nm) of incident light. 相似文献
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Tomoshige Hiratsuka Kento Koketsu Atsushi Minami Shunsuke Kaneko Chiaki Yamazaki Kenji Watanabe Hiroki Oguri Hideaki Oikawa 《Chemistry & biology》2013,20(12):1523-1535
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60.
Sanada H Sogawa T Gotoh H Onomitsu K Kohda M Nitta J Santos PV 《Physical review letters》2011,106(21):216602
Magneto-optic Kerr microscopy was employed to investigate the spin-orbit interactions of electrons traveling in semiconductor quantum wells using surface acoustic waves (SAWs). Two-dimensional images of the spin flow induced by SAWs exhibit anisotropic spin precession behaviors caused by the coexistence of different types of spin-orbit interactions. The dependence of spin-orbit effective magnetic fields on SAW intensity indicates the existence of acoustically controllable spin-orbit interactions resulting from the strain and Rashba contributions induced by the SAWs. 相似文献