Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
Volume 42 , Issue 8
Showing 1-50 articles out of 58 articles from the selected issue
Highlight Review
  • Pounraj Thanasekaran, Chia-Yuan Huang, Kuang-Lieh Lu
    2013 Volume 42 Issue 8 Pages 776-784
    Published: August 05, 2013
    Released: August 05, 2013
    [Advance publication] Released: June 21, 2013
    JOURNALS FREE ACCESS
    Molecular rotors are a type of molecular machine that can rotate with respect to its surrounding environment or in which one part rotates with respect to another part. Various approaches to preparing rotary molecular motors with variable radii and functional groups have been attempted because rotating units are ubiquitous in natural systems. The motion of these rotors in solution or on a solid surface can be monitored either by NMR or STM techniques. Previous findings indicate that the motion of a molecular rotor can be manipulated in a more controlled fashion by changing the molecular structure or applying external stimuli such as heat, photons, electricity, chemical reactions, or applying external field STM tunneling current. Molecular dynamics simulations have also been performed in attempts to understand the molecular rotations of rotors, and the theoretical calculations agree well with experimental observations. In this highlight review, we describe synthetic approaches, structural characterization, and dynamic behavior of discrete metallacyclic rotors in solution and on solid surfaces.
    In this highlight review, we describe synthetic approaches, structural characterization, and dynamic behavior of discrete metallacyclic rotors in solution and on solid surfaces. Fullsize Image
     
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  • Noritsugu Kometani, Yasuaki Sumiyoshi
    2013 Volume 42 Issue 8 Pages 804-806
    Published: August 05, 2013
    Released: August 05, 2013
    [Advance publication] Released: May 31, 2013
    JOURNALS RESTRICTED ACCESS
    The catalytic and photocatalytic hydrothermal oxidation of chlorobenzene has been examined at reaction temperatures ranging from 25 to 400 °C and at a fixed pressure of 30 MPa, using Cu(II)-grafted tungsten trioxide (Cu/WO3) as the catalyst and hydrogen peroxide as the oxidizing reagent. The decomposition efficiency of chlorobenzene is dramatically promoted with the aid of Cu/WO3, and approximately 100% decomposition efficiency has been achieved in the dark at a reaction temperature of 200 °C. It is proposed that the formation of hydroxyl radicals from hydrogen peroxide via the Fenton-type reaction catalyzed by Cu ions is subjected to substantial acceleration under subcritical conditions of water at around 200–300 °C, resulting in enhancement of the decomposition efficiency. Irradiation of catalysts with near-UV–visible light also facilitates the decomposition of chlorobenzene because of the photocatalytic action.
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