Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
Volume 42 , Issue 11
Showing 1-37 articles out of 37 articles from the selected issue
Highlight Review
  • Youhei Numata, Shufang Zhang, Xudong Yang, Liyuan Han
    2013 Volume 42 Issue 11 Pages 1328-1335
    Published: November 05, 2013
    Released: November 05, 2013
    [Advance publication] Released: August 24, 2013
    JOURNALS FREE ACCESS
    Cosensitization, a technique involving sensitization of a metal-oxide semiconductor electrode with two or more different dyes, is a promising strategy to enhance light-harvesting capabilities of dye-sensitized solar cells through expansion of the light absorption range. In this review, we introduce recent developments in highly efficient solar cells cosensitized by ruthenium–polypyridyl and organic dyes. Design strategies for cosensitizer molecules, development of UV and NIR cosensitizers, and performances of reported cosensitized solar cells are reviewed. Cosensitization is an effective method to improve the conversion efficiencies, as not only photocurrent but also photovoltage can be increased by employing an appropriate cosensitizer.
    Cosensitization, a technique involving sensitization of a metal-oxide semiconductor electrode with two or more different dyes, is a promising strategy to enhance light-harvesting capabilities of dye-sensitized solar cells. In this review, we introduce recent developments in highly efficient solar cells cosensitized by ruthenium–polypyridyl and organic dyes and design strategies for cosensitizer molecules. Fullsize Image
     
  • Hayato Yuzawa, Hisao Yoshida
    2013 Volume 42 Issue 11 Pages 1336-1343
    Published: November 05, 2013
    Released: November 05, 2013
    [Advance publication] Released: September 12, 2013
    JOURNALS FREE ACCESS
    Organic syntheses by using TiO2 photocatalysts have been extensively studied in view of green and sustainable chemistry. This highlight review shows our recent studies on photocatalytic direct functionalization of aromatic rings, i.e., aromatic ring hydroxylation with H2O and aromatic ring amination with aqueous NH3 on Pt-loaded TiO2 photocatalysts. Both reactions involve two key steps: one is an activation of a rather stable molecule (H2O or NH3) by a photoexcited hole on the TiO2 surface to produce its radical species, and the other is an aromatic substitution by the radical species through an addition–elimination mechanism. Interestingly, the radical species produced from H2O (surface oxygen radical or hydroxyl radical) is electrophilic while that produced from NH3 (amide radical) is electroneutral. These properties determine the regioselectivity in the functionalization of substituted benzene.
    Organic syntheses by using TiO2 photocatalysts have been extensively studied in view of green and sustainable chemistry. In this highlight review, we describe our recent studies on photocatalytic direct functionalization of aromatic ring, i.e., aromatic ring hydroxylation with H2O and aromatic ring amination with aqueous NH3 on Pt-loaded TiO2 photocatalysts. Both reactions involve two key steps: one is an activation of a rather stable molecule (H2O or NH3) by a photoexcited hole on TiO2 to produce its radical species, and the other is an aromatic substitution by the radical species through the addition–elimination mechanism. Interestingly, the radical species produced form H2O (surface oxygen radical or hydroxyl radical) is electrophilic while that produced from NH3 (amide radical) is electroneutral. These properties determine the regioselectivity in the functionalization of substituted benzene. Fullsize Image
     
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