English  |  正體中文  |  简体中文  |  Items with full text/Total items : 69937/69937 (100%)
Visitors : 23037044      Online Users : 337
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version

    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/71337

    Title: 偶氮金屬配位化合物合成鑑定與性質探討;Synthesis and Property of Metal Azo Compounds
    Authors: 羅偉中;Luo,Wei-Zhong
    Contributors: 化學學系
    Keywords: 偶氮;微流體
    Date: 2016-07-26
    Issue Date: 2016-10-13 12:45:20 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 閃化學(flash chemistry)的有機合成,是指不穩定的中間物質,僅能
    看到M及M-25的峯訊。;A flash reaction in organic chemistry is a reaction, in which an
    unstable intermediate is with very short life and the reaction is completed
    in one second or less. Consequently it is very difficult to conduct such a
    reaction in common batch type setups to successfully obtain the end
    product. On the other hand, a microfluidic reactor system exhibits very
    large specific area in setup and has very great mass transfer and heat
    transfer property. A microfluidic reactor allows fast heating or cooling,
    and thus is suitable for a flash reaction and in general favoring rapid
    reactions. One could achieve very good results to run organic reactions in
    microfluidic reactors by simple adjustment of experimental parameters.
    In this thesis, the preparation of 4 azobenzene derivatives was
    successfully demonstrated using the microfluidic reactor system. The
    azobenzenes were used as chelates to coordinate to chromium and iron to
    form metallic azo-dyes.
    The 4 azobenzenes and 8 metallic azo-dyes were studied with the
    UV-Vis spectroscopic method. As ligands, the azobenzenes show clear
    π−π* and n−π* absorption bands, while the metallic azo-dyes show slight
    shift/change on π−π* absorption bands yet pronounced red-shifts on n−π*
    absorption bands.
    The 4 azobenzenes and 8 metallic azo-dyes were all analyzed with
    mass spectroscopic method using the electrospray ionization source. The
    Cr+3 azo-dyes were interesting in that the central Cr+3 metal ions along the ESI process could be reduced to Cr+2 metal ions that led to exchange of
    Cr+2 metal ions with the counter Na+ metal ions. The negative mass
    spectra of Cr+3 azo-dyes revealed very strong peaks at m/e = [M] and
    [M-25], where M is the molecular ion, agreeing to the facile water
    exchange rates for Cr+2 and Na+ but inert water exchange for Cr+3. No
    such exchange was observed for the analogous Fe+3 azo-dyes: slow water
    exchange being known for both Fe+3 and Fe+2 metal ions.
    Appears in Collections:[化學研究所] 博碩士論文

    Files in This Item:

    File Description SizeFormat

    All items in NCUIR are protected by copyright, with all rights reserved.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback  - 隱私權政策聲明