Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
Volume 45 , Issue 1
Showing 1-32 articles out of 32 articles from the selected issue
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  • Giacomo E. M. Crisenza, John F. Bower
    2016 Volume 45 Issue 1 Pages 2-9
    Published: January 05, 2016
    Released: January 05, 2016
    JOURNALS FREE ACCESS
    There is significant interest in the development of C–C bond-forming methodologies that directly access challenging benzylic stereocenters. Predominantly, efforts have been focused on the development of enantiospecific or enantioselective cross-coupling methodologies. An alternate and conceptually ideal approach involves the development of branch-selective and enantioselective Murai-type alkene hydroarylations. Recent progress towards this broad, yet challenging goal is highlighted.
    There is significant interest in the development of C–C bond-forming methodologies that access directly challenging benzylic stereocenters. Predominant efforts have focused on the development of enantiospecific or enantioselective cross-coupling methodologies. An alternate and conceptually ideal approach resides in the development of branch-selective and enantioselective Murai-type alkene hydroarylations. Recent progress towards this broad, yet challenging goal is highlighted. Fullsize Image
     
Letter
Editor’s Choice
  • Kouta Sugikawa, Atsuki Kubo, Atsushi Ikeda
    2016 Volume 45 Issue 1 Pages 60-62
    Published: January 05, 2016
    Released: January 05, 2016
    [Advance publication] Released: November 12, 2015
    JOURNALS OPEN ACCESS
    Fullerenes solubilized by γ-cyclodextrins (γ-CDx) were efficiently transferred to pH-responsive nanogels when they existed in the swollen state below a critical swelling pH. The fullerene molecules subsequently remained encapsulated in the nanogels, regardless of the degree of nanogel swelling, because of their poor aqueous solubility. However, the fullerenes were not transferred from the corresponding γ-CDx complexes to the nanogels when they existed in shrunken state. The resulting fullerene–nanogel composites also exhibited high stability and allowed for the pH-responsive generation of singlet oxygen (1O2) under photoirradiation conditions.
Letter
Editor’s Choice
Letter
  • Hui Yang, TingTing Yang, Han Zhu, Ming Zhang, MingLiang Du
    2016 Volume 45 Issue 1 Pages 69-71
    Published: January 05, 2016
    Released: January 05, 2016
    [Advance publication] Released: October 20, 2015
    JOURNALS RESTRICTED ACCESS
    We present a facile method of growing MoSe2 on carbon nanofibers (CNFs) via chemical vapor deposition (CVD). Polyacrylonitrile (PAN) was electrospun into nanofibrous mats and graphitized to form CNFs. Subsequent selenization of MoO3 in a CVD system on the surface of the CNFs produced MoSe2/CNFs hybrid. Scanning and transmission electron microscope (SEM and TEM) images revealed large-area MoSe2 nanosheets attached to the CNFs and indicated that the synthesized MoSe2/CNFs hybrids were highly crystalline. Such a structure should increase the surface area and maximally expose the MoSe2 edges, which may boost catalytic activity. The MoSe2/CNFs hybrid was directly used as working electrode for hydrogen evolution reaction (HER) and exhibited significantly enhanced catalytic activity. The onset potential, the over-potential at a current density of 10 mA cm−2, and Tafel slope of the MoSe2/CNFs hybrid were −69 mV, −219 mV, and 107 mV decade−1, respectively. The results suggest that the MoSe2/CNFs hybrid can serve as effective and promising catalyst for HER.
  • Keisuke Takashita, Takahiro Matsumoto, Takeshi Yatabe, Hidetaka Nakai, ...
    2016 Volume 45 Issue 1 Pages 72-74
    Published: January 05, 2016
    Released: January 05, 2016
    JOURNALS RESTRICTED ACCESS
    We report the first example of reduction of O2 to H2O by a Ni(II) dihydrido species. Isotope-labeling experiments reveal a four-electron reduction of O2 by the dihydrido species. The water-soluble Ni(II) dihydrido species was characterized by X-ray analysis, electrospray ionization mass spectrometry, and IR, 1H NMR, ESR, and UV–vis spectroscopies.
  • Hong-jiang Ni, Jin-gang Liu, Shi-yong Yang
    2016 Volume 45 Issue 1 Pages 75-77
    Published: January 05, 2016
    Released: January 05, 2016
    [Advance publication] Released: November 05, 2015
    JOURNALS RESTRICTED ACCESS
    Two fluorinated polyphenylquinoxalines (FPPQs) have been prepared from the newly developed trifluoromethyl-containing aromatic bis(α-diketone) monomers (FTKs) and aromatic bis(o-diamine). The thermal, electrical, and hydrolytic properties of the FPPQs were investigated. The results reveal that the developed FPPQ films exhibit low dielectric constants of 2.78–2.85, which are closely related to their excellent hydrophobic nature. The FPPQ films also manifest excellent hydrolytic stability in the aqueous environment. Meanwhile, the intrinsically high thermal stability and electrical resistivity are maintained for the FPPQs.
  • Shinpei Yamamoto, Yoshihiro Kusano
    2016 Volume 45 Issue 1 Pages 78-80
    Published: January 05, 2016
    Released: January 05, 2016
    JOURNALS RESTRICTED ACCESS
    A method to prepare FePt/PbS core/shell nanoparticles with a controllable PbS thickness (dPbS) based on the reaction of lead oleate and sulfur in the presence of FePt nanoparticles has been developed. It was demonstrated that dPbS can be finely controlled from ca. 0.5 to 4.3 nm by adjusting the reaction temperature and/or the time. The resulting FePt/PbS core/shell nanoparticles with various dPbS’s showed smaller magnetic anisotropies than those of the pristine FePt nanoparticles. The observed anisotropies were almost constant and independent of dPbS. This result indicates that it is the surface anisotropy and not the interparticle magnetic dipolar interactions that predominantly determines the magnetic properties of the FePt/PbS core/shell nanoparticles.
  • Toshiyasu Inuzuka, Yoshinori Kawazoe, Satomi Kobayashi, Rie Matsumoto, ...
    2016 Volume 45 Issue 1 Pages 81-82
    Published: January 05, 2016
    Released: January 05, 2016
    [Advance publication] Released: November 14, 2015
    JOURNALS RESTRICTED ACCESS
    The novel 9,11-secosteroid, haebaruol, was isolated from the soft coral Clavularia sp. collected from the Ishigaki Island, Okinawa, Japan. The planar structure of haebaruol was elucidated by NMR spectroscopic analysis and its relative and absolute stereochemistry was determined by X-ray crystallographic analysis and a modified Mosher’s method. Haebaruol exhibited cytotoxicity against HeLa cells.
  • Amanpreet Kaur, Vasundhara Singh
    2016 Volume 45 Issue 1 Pages 83-85
    Published: January 05, 2016
    Released: January 05, 2016
    [Advance publication] Released: October 20, 2015
    JOURNALS RESTRICTED ACCESS
    A novel, magnetically separable, nanosized carbapalladacycle has been synthesized by anchoring a carbapalladacycle moiety on the surface of magnetic Fe3O4@SiO2. The as-prepared catalyst was well characterized and evaluated for Suzuki, Heck, and Sonogashira coupling reactions in terms of its activity in ionic liquid media. The catalyst could be easily recovered from the reaction medium by an external magnet and could be recycled for up to seven cycles without any appreciable loss in activity.
Editor’s Choice
Letter
  • Dan Li, Jin Cui, Hua Zhang, Hao Li, Mingkui Wang, Yan Shen
    2016 Volume 45 Issue 1 Pages 89-91
    Published: January 05, 2016
    Released: January 05, 2016
    [Advance publication] Released: November 05, 2015
    JOURNALS OPEN ACCESS
    This study compares the photovoltaic performance of the inverted planar perovskite solar cells with and without poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) as the hole transport layer (HTL). The device ITO/CH3NH3PbI3/PCBM/Al (PCBM: [6,6]-phenyl-C61-butyric acid methyl ester) without PEDOT:PSS achieved a power conversion efficiency of 5.69%, which is much lower than that (ca. 10%) for the device with HTL. The effect of the HTL on the device performance was investigated by electronic impedance spectroscopy and transient photovoltage decay characterization. The results revealed that the low efficiency of HTL-free devices can be attributed to an inefficient electron-blocking capability. The absence of the HTL causes serious recombination at the ITO/perovskite interface, and thus results in low photovoltage and fill factor.
  • Shoji Nozato, Abul K. Mallik, Eisaku Satoh, Rika Fukuda, Hullathy S. G ...
    2016 Volume 45 Issue 1 Pages 92-94
    Published: January 05, 2016
    Released: January 05, 2016
    [Advance publication] Released: November 12, 2015
    JOURNALS OPEN ACCESS
    We introduce a facile method to synthesize a new class of core–shell microspheres composed of resin core particles coated with various carbon materials. The core–shell microspheres were prepared by a one-pot process in which carbon materials such as edge-exfoliated graphite and expanded graphite were dispersed together with core substrates like polystyrene and poly(styrene/2-hydroxyethyl methacrylate) spherical particles in supercritical carbon dioxide. The obtained microspheres were characterized by thermogravimetric analysis, Raman spectroscopy, and scanning electron microscopy. The results indicate that the carbon shells are tightly attached to the surface of the core substrates. Furthermore, because of excellent adhesion, the carbon-coated polymer particles exhibited extremely high electrical conductivity with particle resistance of less than 50 Ω cm despite the presence of an insulating polymeric core material.
  • Kenichi Tonokura, Ryo Takahashi
    2016 Volume 45 Issue 1 Pages 95-97
    Published: January 05, 2016
    Released: January 05, 2016
    [Advance publication] Released: November 12, 2015
    JOURNALS RESTRICTED ACCESS
    Using mid-infrared laser direct absorption spectroscopy with a quantum cascade laser light source, we investigated the room-temperature pressure broadening of nitrous oxide (N2O) in carbon dioxide (CO2) over the 1273.7–1277.2 cm−1 wavenumber range for the ν1 symmetric stretching mode. The five measured absorption profiles of N2O were analyzed with Voigt functions. The CO2 pressure broadening coefficients ranged from 0.091(3) cm−1 atm−1 for the P(13) line to 0.125(2) cm−1 atm−1 for the P(9) line.
  • Masaya Ogawa, Yoshiki Ishii, Norikazu Ohtori
    2016 Volume 45 Issue 1 Pages 98-100
    Published: January 05, 2016
    Released: January 05, 2016
    JOURNALS RESTRICTED ACCESS
    A simple and direct evaluation method for concentration fluctuation (CF), using molecular dynamics simulation, is presented and applied to Lennard–Jones liquid mixtures and an aqueous solution of 1-propanol. The method is intuitive and straightforward, and the results are consistent with those based on the Kirkwood–Buff integrals. It enables us to quantitatively and visually observe the time evolution of the mesoscopic CF.
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