English  |  正體中文  |  简体中文  |  Items with full text/Total items : 6047/14565 (42%)
Visitors : 13636509      Online Users : 346
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: https://ir.fy.edu.tw:8080/ir/handle/987654321/15171

    Title: Cyclodextrin effects on the photochromism of spiropyrans / β-cyclodextrin inclusion polymers
    Authors: Wang, Li-Fen;Chen, Jyun-Wei;Chen, Jyun-Wun
    Contributors: 輔英科技大學 應用化學及材料科學系
    Date: 2012-09-01
    Issue Date: 2013-08-26 13:59:45 (UTC+8)
    Abstract: A series of photochromic polymers were prepared by forming inclusion complexes of various spiropyrans (SPs) in the cyclodextrin cavities of the β-cyclodextrin polymer (CDP). Experimental and calculation results demonstrate that the hydrophobic β-CD cavities can encapsulate the studied SPs from an aqueous solution and form 1:2 SP/β-CD inclusion complexes. The complexes undergo reversible photoinduced isomerization from a colorless closed form with absorption maxima (λexpt) at 297–359?nm to a colored open-form photomerocyanines (PMs) with absorption maxima at 547–618?nm. For the less polar closed-form SPs, the β-CD cavity behaves similarly to toluene, providing a hydrophobic environment, and thus the?λexpt?of the inclusion complexes of SPs with the β-CD in CDP is increased compared with that of ethanol solutions of the SPs. However, the structure effects from the steric hindrance of the β-CD cavity reduce the energy gap of excitation and further increase the?λexpt?of SPs. For zwitterionic open-form PMs, the hydroxyl groups, laced on the rims of β-CD, act similarly to ethanol. The interaction effects from the hydroxyl groups simultaneously lower the ground- and excited-state energy of the SPs. The competing effects between the structure and interaction factors cause changes in the?λexpt?of SPs.
    Relation: Materials Chemistry and Physics 136(1),151-159
    Appears in Collections:[應用化學及材料科學系] 期刊論文

    Files in This Item:

    File SizeFormat

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


    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback