Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
Volume 45 , Issue 5
Showing 1-26 articles out of 26 articles from the selected issue
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  • Yasuro Niidome, Aung Thu Haine, Takuro Niidome
    2016 Volume 45 Issue 5 Pages 488-498
    Published: May 05, 2016
    Released: May 05, 2016
    [Advance publication] Released: February 27, 2016
    JOURNALS FREE ACCESS
    Among the several types of nanoparticles in existence, anisotropic gold-based nanoparticles demonstrate special advantages because of their unique properties. Gold nanoparticles can be prepared and modified with a wide range of functional materials including polymers, surfactants, ligands, dendrimers, drugs, DNA, RNA, proteins, peptides, and oligonucleotides. Hence, they are a promising vehicle for bioimaging, drug delivery, and other therapies. This review mainly addresses the properties, preparation, and applications of anisotropic gold nanoparticles in biomedical applications and targeted drug delivery.
    Among the many type of nanoparticle available, anisotropic gold-based nanoparticles demonstrate special advantages because of their unique properties. Gold nanoparticles can be prepared and modified with a wide range of functional materials such as polymers, surfactants, ligands, dendrimers, drugs, DNA, RNA, proteins, peptides, and oligonucleotides. Hence, they are a promising vehicle for bioimaging, drug delivery, and various therapies. This review mainly addresses the properties, preparation, and applications of anisotropic gold nanoparticles in biomedical applications and targeted drug delivery. Fullsize Image
     
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  • Naijin Wu, Baoshan Li
    2016 Volume 45 Issue 5 Pages 499-501
    Published: May 05, 2016
    Released: May 05, 2016
    [Advance publication] Released: February 18, 2016
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    A series of highly dispersed bimetallic and bifunctional catalysts Pt@M-MCM-41 (M = Ni, Co) were prepared successfully by in situ synthesis combined with a coprecipitation method. In the catalysts, the transition metal ions were incorporated into the MCM-41 framework and highly dispersed in tetrahedral coordination by in situ thermal crystallization using ammonia as the ligand. The platinum components were highly dispersed in the inner of the M-MCM-41 (M = Ni, Co) matrix via coprecipitation in alkaline condition. These catalysts possess good performance for hydrocracking of residual oil.
  • Kazuya Murakami, Yousuke Ooyama, Seiji Watase, Kimihiro Matsukawa, Shu ...
    2016 Volume 45 Issue 5 Pages 502-504
    Published: May 05, 2016
    Released: May 05, 2016
    [Advance publication] Released: February 18, 2016
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    The reaction of diphenyldipyridinogermole with [Cu2I2(PPh3)3] in THF afforded a complex with high thermal stability. Crystals with linear polymeric structures (determined by single-crystal X-ray diffraction study) emitted orange phosphorescence with the quantum yield of 25%. The sufficient solubility of the complex permitted the fabrication of a complex-doped poly(methyl methacrylate) (PMMA) self-standing phosphorescent film.
  • Hideko Koshima, Kiminori Miyazaki, Saori Ishii, Toru Asahi
    2016 Volume 45 Issue 5 Pages 505-507
    Published: May 05, 2016
    Released: May 05, 2016
    [Advance publication] Released: February 18, 2016
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    Upon microwave irradiation, esterification of octanoic acid with 1-octanol in the presence of hydrochloric acid as an acid catalyst proceeded more efficiently in glass vessels than in silicon carbide (SiC) vessels, affording 1-octyl octanoate in higher yields and revealing microwave effects during esterification.
  • Takeru Iwamura, Shu-ichi Goto, Masato Sakaguchi, Yoshiki Chujo
    2016 Volume 45 Issue 5 Pages 508-510
    Published: May 05, 2016
    Released: May 05, 2016
    [Advance publication] Released: February 18, 2016
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    The synthesis of submicrometer zinc oxide (ZnO) particles by a microwave-assisted sol–gel reaction in a non-alcoholic solvent was investigated. ZnO particles were rapidly prepared by the microwave-assisted sol–gel reaction of zinc acetate dihydrate, which is an inorganic monomer, with distilled water in N,N-dimethylacetamide as a solvent. ZnO particles that were prepared from zinc acetate dihydrate by the sol–gel reaction were changed into ZnO nanowires after microwave irradiation.
  • Hiroki Hayashi, Tomokazu Iseki, Hiromasa Goto
    2016 Volume 45 Issue 5 Pages 511-513
    Published: May 05, 2016
    Released: May 05, 2016
    [Advance publication] Released: February 20, 2016
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    We synthesized optically active compounds having a menthyl group as a chiral additive that induces a cholesteric phase in a nematic liquid crystal (NLC) and a homeotropic orientation in a smectic A* phase (SmA*LC). 2,2′,5′,2′′-Ter(3,4-ethylenedioxythiophene) (terEDOT) can be electropolymerized in LC electrolyte solution containing the optically active compound. Polymerization in a cholesteric liquid crystal (CLC) electrolyte solution produced by the chiral inducer yielded poly(terEDOT) showing chiral aggregation with one-handed helices. The resultant poly(terEDOT)s obtained in the CLC electrolyte solution displayed complementary mirror-image bisignate Cotton effect. Furthermore, polymerization in SmA*LC electrolyte solution in a homeotropic orientation afforded a poly(terEDOT) with vertically oriented morphology.
  • Kosuke Kaneko, Saeka Yoshikai, Hideyasu China, Tomonori Hanasaki
    2016 Volume 45 Issue 5 Pages 514-516
    Published: May 05, 2016
    Released: May 05, 2016
    [Advance publication] Released: February 20, 2016
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    The liquid crystalline (LC) organization formed through a complementary hydrogen-bonded nucleobase-pair of adenine (A)–thymine (T) has been studied in this research. The non-mesogenic compounds have been synthesized by using adenine and thymine with different lengths of normal alkyl chains. The mixing of the two non-mesogenic units together resulted in the formation of mesophases. The A–T base pair is found to play an important role in the formation of the LC phase, and create the functionalized core connected by hydrogen bonds to act like a mesogenic group.
  • Tamotsu Horiuchi, Tohru Yashiro, Ryo Kawamura, Satoshi Uchida, Hiroshi ...
    2016 Volume 45 Issue 5 Pages 517-519
    Published: May 05, 2016
    Released: May 05, 2016
    [Advance publication] Released: February 20, 2016
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    We report a new series of indoline dyes with a donor–aromatic–acceptor (D–π–A) structure. D–π–A metal-free organic dyes with indoline–benzothiazole–rhodanine units were synthesized and their photovoltaic performances were evaluated. The photoelectric conversion efficiency (η) of the indoline–benzothiazole–rhodanine dye is 3.7%, while that of the indoline–thiophene–rhodanine dye is 0.9% under the same conditions. The incident photon-to-current conversion efficiencies (IPCEs) of these dyes are 60% and 25%, respectively, at 500 nm. To understand their electronic structures, the geometries of the dyes were optimized by density functional theory (DFT) calculations at the 6-31G(d) level using a B3LYP exchange-correlation functional. As a result, the localized highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) of the indoline–benzothiazole–rhodanine dye were obtained and were compared with those of the indoline–thiophene–rhodanine dye.
  • Kazuma Ohshiro, Hang-Beom Bu, DaeGwi Kim
    2016 Volume 45 Issue 5 Pages 520-522
    Published: May 05, 2016
    Released: May 05, 2016
    [Advance publication] Released: February 20, 2016
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    We propose a new preparation method for layered structures consisting of lipid-soluble CdSe quantum dots (QDs) and water-soluble Au nanoparticles (NPs). The self-assembled monolayer of (3-mercaptopropyl)trimethoxysilane (MPTMS) was introduced as a “binder” of lipid-soluble QDs on a polyelectrolyte layer (PE). Furthermore, the separation distance between the CdSe QDs and the Au NP layers was controlled by the thickness of the PE layers, and the systematic change from PL quenching to PL enhancement of the CdSe QDs is observed.
  • Kazu Okumura, Masakazu Nakanishi, Yujiro Kikuchi, Tomoyuki Kouno
    2016 Volume 45 Issue 5 Pages 523-525
    Published: May 05, 2016
    Released: May 05, 2016
    [Advance publication] Released: February 26, 2016
    JOURNALS RESTRICTED ACCESS
    A mixture of triphenylamine (NPh3) and zeolite Y was thermally treated in an autoclave at 423 K, resulting in the inclusion of NPh3 into the supercage of zeolite Y in 2 h, up to 20 wt % (1.5 NPh3 molecules per supercage). The overall phenomena were close to those observed in the inclusion of triphenylphosphine (PPh3) into the supercage of zeolite Y.
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