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  1. AU="Ishisaka, Takuya"
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  3. AU=Nipp Ryan D.
  4. AU="Lucero, D E"
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  6. AU="Lange, Lana"
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  19. AU="Elmasry, Dalia M A" AU="Elmasry, Dalia M A"
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  42. AU="Chunqing Ou"
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  44. AU="Holper, Sarah"
  45. AU="Haider, Farag Ibrahim"
  46. AU="Rice, Jordin L"
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  1. Artikel ; Online: Photochromic organometallics with a dithienylethene (DTE) Bridge, [Y-C[triple bond]C-DTE-C[triple bond]C-Y] (Y={MCp*(dppe)}): photoswitchable molecular wire (M=Fe) versus dual photo- and electrochromism (M=Ru).

    Tanaka, Yuya / Ishisaka, Takuya / Inagaki, Akiko / Koike, Takashi / Lapinte, Claude / Akita, Munetaka

    Chemistry (Weinheim an der Bergstrasse, Germany)

    2010  Band 16, Heft 16, Seite(n) 4762–4776

    Abstract: Dinuclear acetylide-type complexes bridged by a photochromic dithienylethene unit (DTE), [Y-C[triple bond]C-DTE-C[triple bond]C-Y] 1 (Y={MCp*(dppe)}; Cp*=pentamethylcyclopentadienyl, M=Fe (1(Fe)), Ru (1(Ru))), have been prepared, and their wirelike and ... ...

    Abstract Dinuclear acetylide-type complexes bridged by a photochromic dithienylethene unit (DTE), [Y-C[triple bond]C-DTE-C[triple bond]C-Y] 1 (Y={MCp*(dppe)}; Cp*=pentamethylcyclopentadienyl, M=Fe (1(Fe)), Ru (1(Ru))), have been prepared, and their wirelike and switching behavior, as well as their oxidation chemistry has been investigated. The DTE complexes 1 exhibit photochromic behavior in a manner similar to organic DTE derivatives; UV irradiation causes ring closure of the open isomer 1O to form the closed isomer 1C and visible-light irradiation of the resultant 1C causes reverse ring opening to regenerate 1O. But the performance is dependent on the metals. With respect to the interconversion rates and the 1C content at the photostationary state under UV irradiation, the ruthenium complex 1(Ru) is superior to the iron analogue 1(Fe). The wirelike performance is associated with the photochromic processes, and the efficient switching performance has been verified for 1(Fe) as characterized by the V(ab) values [V(ab) is the electronic coupling derived from intervalence charge-transfer (IVCT) bands: V(ab)(1(Fe)C; ON)=0.047 eV versus V(ab)(1(Fe)O; OFF)=0 eV], and are also supported by the large switching factor (SF=K(C)(C; ON)/K(C)(O; OFF)=39; K(C)=comproportionation constant). SF for 1(Ru) is determined to be 4.2. The remarkable switching behavior arises from the different pi-conjugated systems in the two isomeric forms, that is, cross-conjugated (1O) and fully conjugated pi-systems (1C). It was also found that, in contrast to the reversible redox behavior of the iron complex 1(Fe), the ruthenium complex 1(Ru)O undergoes oxidative ring closure to form the dicationic species of the closed isomer 1(Ru)C(2+) and, thus, the ruthenium system 1(Ru) shows dual photo- and electrochromism. The distinct oxidation behavior of 1(Fe) and 1(Ru) can be ascribed to the spin distribution on the diradical intermediates 1(Fe)O(2+) and 1(Ru)O(2+), as supported by DFT calculations.
    Sprache Englisch
    Erscheinungsdatum 2010-04-26
    Erscheinungsland Germany
    Dokumenttyp Journal Article
    ZDB-ID 1478547-x
    ISSN 1521-3765 ; 0947-6539
    ISSN (online) 1521-3765
    ISSN 0947-6539
    DOI 10.1002/chem.200903583
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Artikel ; Online: Effect of end groups of poly(n-butyl methacrylate) on its biocompatibility.

    Fujishita, Shigeto / Inaba, Chika / Ishisaka, Takuya / Gemmei-Ide, Makoto / Kitano, Hiromi

    Colloids and surfaces. B, Biointerfaces

    2009  Band 74, Heft 1, Seite(n) 45–50

    Abstract: Telechelic poly(n-butyl methacrylate)s (PBMAs) with various end groups were prepared using nonionic, anionic, cationic or zwitterionic azo-type radical initiators and cell adhesion onto the surfaces of the polymers was investigated. The tendency for cell ...

    Abstract Telechelic poly(n-butyl methacrylate)s (PBMAs) with various end groups were prepared using nonionic, anionic, cationic or zwitterionic azo-type radical initiators and cell adhesion onto the surfaces of the polymers was investigated. The tendency for cell adhesion to the polymers differed with and without pretreatment with phosphate-buffered saline (PBS, pH 7.4). The cell adhesion to polymer surfaces without pretreatment was lower than that with pretreatment. The effect of pretreatment with PBS was significant for PBMA with ionic end groups. Furthermore, cell adhesion to the surface of PBMA with zwitterionic end groups was suppressed compared with that to the surfaces of other polymers. It was presumed that positive and negative charges of zwitterionic groups in the same molecule negated each other at pH 7.4 and that the polymers with zwitterionic end groups had no effective charges. The results clearly indicated that biocompatibility of polymers can be changed by the introduction of functional groups at the ends of the polymer chains. Fabrication of functional material surfaces will be anticipated by the similar method in the future.
    Mesh-Begriff(e) Air ; Animals ; Biocompatible Materials/chemistry ; Biocompatible Materials/pharmacology ; Cell Adhesion/drug effects ; Cricetinae ; Cricetulus ; Fibroblasts/cytology ; Fibroblasts/drug effects ; Materials Testing ; Polymers/chemistry ; Polymethacrylic Acids/chemistry ; Surface Properties/drug effects ; Temperature
    Chemische Substanzen Biocompatible Materials ; Polymers ; Polymethacrylic Acids ; polybutyl methacrylate (9003-63-8)
    Sprache Englisch
    Erscheinungsdatum 2009-11-01
    Erscheinungsland Netherlands
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1500523-9
    ISSN 1873-4367 ; 0927-7765
    ISSN (online) 1873-4367
    ISSN 0927-7765
    DOI 10.1016/j.colsurfb.2009.06.024
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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