Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
Volume 45 , Issue 12
Showing 1-38 articles out of 38 articles from the selected issue
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  • Michaele J. Hardie
    2016 Volume 45 Issue 12 Pages 1336-1346
    Published: December 05, 2016
    Released: March 24, 2017
    JOURNALS RESTRICTED ACCESS

    Pyramidal molecular hosts related to cyclotriveratrylene (CTV) form self-assembled cages including organic cages, hydrogen-bonded cages, and metallocages. The latter include M3L2, M4L4, M6L8, and M12L8 assemblies, including topologically complicated structures. Metallocages may show ligand exchange and/or homochiral sorting of the C3-symmetric CTV-analog ligands. Cages also occur within coordination networks.

    Pyramidal molecular hosts related to cyclotriveratrylene (CTV) form self-assembled cages including organic cages, hydrogen-bonded cages and metallocages. The latter include M3L2, M4L4, M6L8, and M12L8 assemblies with some topologically complicated structures. Metallocages may show ligand-exchange and/or homochiral sorting of the C3-symmetric CTV-analogue ligands. Cages also occur within coordination networks. Fullsize Image
     
  • Makoto Komiyama
    2016 Volume 45 Issue 12 Pages 1347-1355
    Published: December 05, 2016
    Released: March 24, 2017
    JOURNALS RESTRICTED ACCESS

    By combining Ce(NH4)2(NO3)6 with PrCl3, an unprecedentedly active catalyst for DNA hydrolysis is obtained. This combination is 10 times more active than Ce(IV), which has been hitherto the best catalyst, although Pr(III) is inactive for DNA hydrolysis. In the cooperative catalysis, the Pr(III)-bound hydroxide attacks the phosphate, which is enormously activated by the Ce(IV). Other bimetallic cooperations are also reviewed with emphasis on the acid–base properties of metal ions and their hydration water. Furthermore, catalytically active Ce(IV) complexes of well-characterized structures are prepared by in situ oxidation of Ce(III) complexes.

    Highly active catalysts for DNA hydrolysis are crucially important to design man-made DNA cutters and also to prepare various bio-tools. In this article, attempts to develop these catalysts have been reviewed. Various bimetallic cooperations (especially between Ce(IV) and Pr(III)) are effective for the purpose, and ascribed to acid–base cooperative catalysis. The methods to prepare the corresponding complexes have been also described. Fullsize Image
     
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