English  |  正體中文  |  简体中文  |  Items with full text/Total items : 69937/69937 (100%)
Visitors : 23133995      Online Users : 715
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/987654321/50719


    Title: H-Bonded metallomesogens: preparation, characterization, and mesomorphic studies of (3-hydroxypropylimino)propan-1,2-diols
    Authors: Chien,C;Chen,CJ;Sheu,HS;Lee,GH;Lai,CK
    Contributors: 化學學系
    Keywords: CONTAINING LIQUID-CRYSTALS;COPPER-COMPLEXES;SUPRAMOLECULAR METALLOMESOGENS;COLUMNAR METALLOMESOGENS;HEXAGONAL ARRANGEMENTS;SELF-ORGANIZATION;ROOM-TEMPERATURE;HYDROGEN-BONDS;SUBSTITUENT;MESOPHASES
    Date: 2010
    Issue Date: 2012-03-27 18:08:41 (UTC+8)
    Publisher: 國立中央大學
    Abstract: Two series of new Schiff bases 2 (n=8, 12, 16) derived from (3-hydroxypropyl imino)propan-1, 2-diol with a hydroxyl group at C(19)/C(20)-position and their palladium complexes 1 were prepared and their mesomorphic properties investigated by DSC, POM, and XRD. The presence of both hydroxyl groups was found to be crucial in forming the liquid crystalline behavior. All compounds 2a exhibited smectic A or and C phases, in contrast, all compounds 2b formed hexagonal columnar phases. The formation of mesophases in both compounds 1-2 was probably induced by inter-molecular H-bonds. Single crystallographic data in mesogenic compound 2a (n=8) indicated that a dimeric structure with a better linear or rod-like molecular shape was formed by an inter-molecular H-bond (O4-O1', similar to 1.854 angstrom). Another inter-molecular H-bond (similar to 1.903 angstrom) between two dimeric structures was also observed. It crystallizes in a monoclinic space group P2(1)/c. On the other hand, all palladium complexes 1 formed enantiotropic smectic A phases. Single crystallographic data in mesogenic compound la (n=8) indicated that the geometry at Pd(2+) center was coordinated as slightly twisted square planar. It crystallizes in a monoclinic space group P2(1)/n. An inter-molecular H-bond (similar to 1.799 angstrom) between neighboring molecules were observed, which might have facilitated the formation of mesophases. Variable-temperature powder XRD experiments confirmed their mesophase structures. (C) 2010 Elsevier Ltd. All rights reserved.
    Relation: TETRAHEDRON
    Appears in Collections:[化學學系] 期刊論文

    Files in This Item:

    File Description SizeFormat
    index.html0KbHTML370View/Open


    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