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Showing papers in "Chemistry Letters in 2008"


Journal ArticleDOI
TL;DR: A growing number of papers on research subjects relating to photocatalysis have and will continue to be submitted and published in scientific journals as mentioned in this paper.Some of these, published or still under revie...
Abstract: A growing number of papers on research subjects relating to photocatalysis have and will continue to be submitted and published in scientific journals. Some of these, published or still under revie...

405 citations


Journal ArticleDOI
TL;DR: In this article, the authors used a RuO2-TaON and Pt-TaO mixture with IO3−/I− redox couple under visible light (λ < 500 nm).
Abstract: Overall water splitting was accomplished using a RuO2–TaON and Pt–TaON mixture with IO3−/I− redox couple under visible light (λ<500 nm). This is the first example of overall water splitting based o...

158 citations


Journal ArticleDOI
TL;DR: In this article, the development of a family of chiral bicyclic triazolium salts is described, and treatment of these salts with base provides a nucleophilic carbene which may be used as an organic catalyst for asymmetrization.
Abstract: The development of a family of chiral bicyclic triazolium salts is described. Treatment of these salts with base provides a nucleophilic carbene which may be used as an organic catalyst for asymmet...

155 citations


Journal ArticleDOI
TL;DR: In this article, arylrhodium(I) species across the electron-deficient carbon-carbon double bond and the subsequent /5-fluoride elimination was used to obtain gem-difluoroalkenes.
Abstract: Treatment of α-(trifluoromethyl)styrenes with arylboronic esters and MeMgCl in the presence of a rhodium(I) catalyst affords gem-difluoroalkenes. The reaction proceeds through the addition of arylrhodium(I) species across the electron-deficient carbon-carbon double bond and the subsequent /5-fluoride elimination.

100 citations


Journal ArticleDOI
TL;DR: In this article, successive catalyst-transfer condensation polymerization of a Grignard-type phenylene monomer and then a thiophene monomer with a Ni catalyst yields well-defined block copolymers of poly(p-phenylen...
Abstract: Successive catalyst-transfer condensation polymerization of a Grignard-type phenylene monomer and then a thiophene monomer with a Ni catalyst yields well-defined block copolymers of poly(p-phenylen...

89 citations


Journal ArticleDOI
TL;DR: In this article, a high-silica chabazite with a Si/Al ratio of ca. 17 was obtained by the hydrothermal conversion of FAU zeolite used as a crystalline si/Al source in benzyltrime.
Abstract: A highly crystalline and pure high-silica chabazite zeolite with a Si/Al ratio of ca. 17 was obtained by the hydrothermal conversion of FAU zeolite used as a crystalline Si/Al source in benzyltrime...

82 citations


Journal ArticleDOI
TL;DR: In this paper, a spin crossover complex was embedded into the light-emitting layer of an organic electroluminescent (EL) device with chlorophyll a. The temperature dependence of the EL spectra shows the quenching of the emission below 260 K, which is the spin transition temperature of [Fe(dpp) 2 ](BF 4 ) 2.
Abstract: A film of a spin-crossover complex [Fe(dpp) 2 ](BF 4 ) 2 (dpp = 2,6-di(pyrazol-1-yl)pyridine) was embedded into the light-emitting layer of an organic electroluminescent (EL) device with chlorophyll a. While the EL spectrum was observed at 300K, the spectrum could not be observed at 200K. The temperature dependence of the EL spectra shows the quenching of the emission below 260 K, which is the spin-transition temperature of [Fe(dpp) 2 ](BF 4 ) 2 . This suggests that the EL quenching accompanied the spin transition.

76 citations


Journal ArticleDOI
TL;DR: The electrical conductivity of ceria solid solutions has been extensively investigated for many years, and many theories have been advanced to explain the differences seen in ostensibly identical mixtures as mentioned in this paper.
Abstract: The electrical conductivity of ceria solid solutions has been extensively investigated for many years, and many theories have been advanced to explain the differences seen in ostensibly identical m...

76 citations


Journal ArticleDOI
TL;DR: Direct catalytic C-H functionalization of alcohols at the carbinol carbon is achieved and carbonyl allylation, propargylation and vinylation from the alcohol oxidation level in the absence of stoichiometric organometallic reagents or metallic reductants.
Abstract: Under the conditions of ruthenium catalyzed transfer hydrogenation employing isopropanol as terminal reductant, π-unsaturated compounds (1,3-dienes, allenes, 1,3-enynes and alkynes) reductively couple to aldehydes to furnish products of carbonyl addition. In the absence of isopropanol, π-unsaturated compounds couple directly from the alcohol oxidation level to form identical products of carbonyl addition. Such "alcohol-unsaturate C-C couplings" enable carbonyl allylation, propargylation and vinylation from the alcohol oxidation level in the absence of stoichiometric organometallic reagents or metallic reductants. Thus, direct catalytic C-H functionalization of alcohols at the carbinol carbon is achieved.

69 citations


Journal ArticleDOI
TL;DR: Li2CuO2 was used for the CO2 chemisorption process as mentioned in this paper and was thermally treated under a flux of CO2, dynamically (from 25 to 1000 °C) and isothermically.
Abstract: Li2CuO2 was used for the CO2 chemisorption process. Li2CuO2 was thermally treated under a flux of CO2, dynamically (from 25 to 1000 °C) and isothermically. The results clearly showed that Li2CuO2 i...

64 citations


Journal ArticleDOI
TL;DR: Fused five-membered zinc porphyrin carboxylic acid has been synthesized to improve light-harvesting capability in the visible and near-infrared regions.
Abstract: Fused five-membered zinc porphyrin carboxylic acid has been synthesized to improve light-harvesting capability in the visible and near-infrared regions. The fused porphyrin-sensitized TiO2 cell exh...

Journal ArticleDOI
TL;DR: An asymmetric amide anion, FTA− {[(FSO2)(CF3SO2)N]−}, has a significant ability to reduce the melting points of an aliphatic quaternary ammonium salts even for a symmetric tetraethylammonium as mentioned in this paper.
Abstract: An asymmetric amide anion, FTA− {[(FSO2)(CF3SO2)N]−}, has a significant ability to reduce the melting points of an aliphatic quaternary ammonium salts even for a symmetric tetraethylammonium. Much ...

Journal ArticleDOI
TL;DR: Ortho-selective direct arylation of arylazoles with bromides has been accomplished in the presence of a catalytic amount of ruthenium complexes as discussed by the authors.
Abstract: Ortho-selective direct arylation of arylazoles with aryl bromides has been accomplished in the presence of a catalytic amount of ruthenium complexes.

Journal ArticleDOI
TL;DR: The second crystal structure of boryllithium 2 with two coordinating THF solvent molecules was obtained in this paper, and the 11B NMR chemical shift of a THF solution was made by dissolving single crystals of 2·(THF)2.
Abstract: The second crystal structure of boryllithium 2 with two coordinating THF solvent molecules was obtained. The 11B NMR chemical shift of a THF solution, made by dissolving single crystals of 2·(THF)2...

Journal ArticleDOI
TL;DR: In this article, the nucleophilic addition of RLi to a triple bond of dibenzocycloocta[a,e]diyne provides dibenzo[b,f]pentalene motif through trans-annulation of the resulting vinyllithium.
Abstract: Nucleophilic addition of RLi to a triple bond of dibenzocycloocta[a,e]diyne provides dibenzo[b,f]pentalene motif through trans-annulation of the resulting vinyllithium. Dibenzopentalene anion thus ...

Journal ArticleDOI
TL;DR: Polymer-incarcerated gold (PI Au) cluster catalysts mediated aerobic oxidation of hydroquinones and catechols to quinones very efficiently under mild conditions in this article.
Abstract: Polymer-incarcerated gold (PI Au) cluster catalysts mediated aerobic oxidation of hydroquinones and catechols to quinones very efficiently under mild conditions. The characteristic role of water in...

Journal ArticleDOI
TL;DR: In this article, the ionic conductivities of imidazolium salts containing an L-glutamic acid moiety have been studied, and the results showed that the (CF3SO2)2N− salt forming the c...
Abstract: Liquid-crystalline (LC) behavior and ionic conductivities of imidazolium salts containing an L-glutamic acid moiety have been studied. The ionic conductivities of the (CF3SO2)2N− salt forming the c...

Journal ArticleDOI
TL;DR: A series of red-emissive BODIPY derivatives 2−4 having five to seven phenyl groups on their periphery were synthesized, and their photophysical and electrochemical properties were investigated as mentioned in this paper.
Abstract: A series of red-emissive BODIPY derivatives 2–4 having five to seven phenyl groups on their periphery were synthesized, and their photophysical and electrochemical properties were investigated. Whi...

Journal ArticleDOI
TL;DR: New C2-symmetric chiral diene ligands bearing a tetrafluorobenzobarrelene framework and (−)-menthyl groups as chiral auxiliaries were prepared through [4 + 2] cycloaddition of 1,4-bis((−)-methoxym....
Abstract: New C2-symmetric chiral diene ligands bearing a tetrafluorobenzobarrelene framework and (−)-menthyl groups as chiral auxiliaries were prepared through [4 + 2] cycloaddition of 1,4-bis((−)-menthoxym...

Journal ArticleDOI
TL;DR: In this article, a novel distillation method in microchannels was reported, where hydrophilic-hydrophobic patterned microchannel structure was utilized for the gas-liquid separator in the evaporator.
Abstract: This paper reports a novel distillation method in microchannels. For the gas–liquid separator in the evaporator, hydrophilic–hydrophobic patterned microchannel structure was utilized. In order to c...

Journal ArticleDOI
TL;DR: Lipophilic linear iron(II) 1,2,4-triazole complexes with 9,10-dimethoxyanthracene-2-sulfonate and 1-pyrenesulfonates counter ions are newly developed as mentioned in this paper.
Abstract: Lipophilic, linear iron(II) 1,2,4-triazole complexes with 9,10-dimethoxyanthracene-2-sulfonate and 1-pyrenesulfonate counter ions are newly developed. These complexes are dispersed in toluene as na...

Journal ArticleDOI
TL;DR: The complexation reaction of copper(II) ion and N-(m-hydroxyphenylene)salicylideneaminate (mhsa) in EtOH yields EtOH-inclusion and noninclusion crystalline samples as mentioned in this paper.
Abstract: The complexation reaction of copper(II) ion and N-(m-hydroxyphenylene)salicylideneaminate (mhsa) in EtOH yields EtOH-inclusion and noninclusion crystalline samples, [Cu(mhsa)2]·2EtOH (1) and [Cu(mh...

Journal ArticleDOI
TL;DR: In this article, spherical silica particles with large mesopores and controlled particle size in the submicron range were prepared using a mixed solution of silica nanoparticles and nanosized polymer particle as a...
Abstract: Spherical silica particles with large mesopores and controlled particle size in the submicron range were prepared using a mixed solution of silica nanoparticles and nanosized polymer particle as a ...

Journal ArticleDOI
TL;DR: In this paper, click chemistry was demonstrated via 1,3-dipolar polycycloaddition of homo-ditopic nitrile oxides to bifunctional terminal olefinic and acetylenic monomers.
Abstract: New click chemistry is demonstrated. Click polymerization proceeded via 1,3-dipolar polycycloaddition of homo-ditopic nitrile oxides to bifunctional terminal olefinic and acetylenic monomers as dip...

Journal ArticleDOI
TL;DR: In this paper, the effect of surface roughness on the internal fluidity of a water droplet during sliding on an inclined Si surface treated fluoroalkylsilane (FAS) was investigated using particle image velocimetr.
Abstract: The effect of surface roughness on the internal fluidity of a water droplet during sliding on an inclined Si surface treated fluoroalkylsilane (FAS) was investigated using particle image velocimetr

Journal ArticleDOI
TL;DR: In this article, a hybrid photocatalyst was demonstrated to decompose 2-propanol into CO2 via acetone under visible-light (450-580 nm) irradiation.
Abstract: TiO2 powder grafted with CrIII ions was demonstrated to become a novel type of hybrid photocatalyst. It could decompose 2-propanol into CO2 via acetone under visible-light (450–580 nm) irradiation....

Journal ArticleDOI
TL;DR: In this article, a block copolymer possessing a reactive group at the PEG chain end (R-PEG-b-PAMA) was synthesized by two different polymerization techniques.
Abstract: Poly(ethylene glycol)-b-poly(2-(N,N-dimethylamino)ethyl methacrylate) block copolymers possessing a reactive group at the PEG chain end (R-PEG-b-PAMA) was synthesized by two different polymerization techniques. Using R-PEG-b-PAMA block copolymer thus obtained, gold nanoparticles (GNPs) were prepared. The PEG-b-PAMA worked as not only reducing agent of aurate ions but also coordination on the obtained nanoparticle surface. The obtained GNP had controlled sizes and narrow size distributions. It is also showed extremely high dispersion stability due to the PEG tethering chains on the surface. The same strategy could be applicable to other nanoparticles such as semiconductor quantum dot and inorganic porous nanoparticles. Using PEGylated GNPs thus prepared, several applications such as molecular recognitions, siRNA release and enzyme immobilizations were carried out. The functionalities of these materials are described in this review.

Journal ArticleDOI
TL;DR: In this paper, metal ion-coupled and proton-couple electron-transfer reactions of dioxygen were described for one-electron, two-and fourelectron reduction.
Abstract: Metal ion-coupled and proton-coupled electron-transfer reactions of dioxygen is described for one-electron, two-electron, and four-electron reduction of dioxygen by one-electron reductants such as ...

Journal ArticleDOI
TL;DR: In order to commercialize polymer electrolyte fuel cells (PEFCs) widely, partially oxidized transition-metal carbide-nitride (TM-C-N; TM = Ti, Zr, and Ta) have been investigated as new cathodes as discussed by the authors.
Abstract: In order to commercialize polymer electrolyte fuel cells (PEFCs) widely, partially oxidized transition-metal carbide–nitride (TM-C–N; TM = Ti, Zr, and Ta) have been investigated as new cathodes wit...

Journal ArticleDOI
TL;DR: The electrolytic properties of a lithium battery electrolyte based on triethyl(2methoxyethyl)phosphonium bis(trifluoromethylsulfonyl)imide are described in this paper.
Abstract: The electrolytic properties of a lithium battery electrolyte based on triethyl(2-methoxyethyl)phosphonium bis(trifluoromethylsulfonyl)imide are described. Testing charge–discharge performance of th...