Langmuir-Blodgett Films of Charge-Transfer Complexes : Ethylenedithio-Substituted Amphiphilic Bis-TTF Macrocycle and F_4TCNQ or Br_2TCNQ

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Abstract

Charge-transfer (CT) complexes between ethylenedithio-substituted bis-TTF macrocycle <b>1a</b>, as an amphiphilic electron donor, and 7,7,8,8-tetracyano-<i>p</i>-quinodimethane (TCNQ) derivatives, as electron acceptors, were fabricated as Langmuir–Blodgett (LB) films. For the <b>1a</b>–F<sub>4</sub>TCNQ LB film deposited at a surface pressure of 5 mN m<sup>−1</sup> onto a substrate surface, the stoichiometry between the donor and acceptor was determined as 1:2 using XPS measurements. In contrast, a donor/acceptor ratio of 1:0.3 was observed for the <b>1a</b>–Br<sub>2</sub>TCNQ LB film, indicating that a fraction of Br<sub>2</sub>TCNQ was lost during the LB film formation process. Similarity of the round-shaped domains that cover the surfaces of the <b>1a</b>–Br<sub>2</sub>TCNQ and neutral <b>1a</b> LB films indicates the presence of neutral <b>1a</b> within the <b>1a</b>–Br<sub>2</sub>TCNQ LB film. For the (<b>1a</b><sup>2+</sup>)(F<sub>4</sub>TCNQ<sup>−</sup>)<sub>2</sub> LB film, the presence of a CN-stretching frequency signifies the formation of a fully ionic electronic ground state. The LB film of <b>1a</b>–Br<sub>2</sub>TCNQ exhibited a broad absorption at ca. 3 × 10<sup>3</sup> cm<sup>−1</sup>, which is characteristic of an intermolecular CT transition for a partial CT state. <b>1a</b>–Br<sub>2</sub>TCNQ LB film consisted of neutral <b>1a</b> and CT complex of <b>1a</b>–Br<sub>2</sub>TCNQ. The room temperature conductivity of the <b>1a</b>–Br<sub>2</sub>TCNQ LB film (1.2 × 10<sup>−2</sup> S cm<sup>−1</sup>) was two orders of magnitude higher than that of <b>1a</b>–F<sub>4</sub>TCNQ (3.9 × 10<sup>−4</sup> S cm<sup>−1</sup>).

Journal

  • Bulletin of the Chemical Society of Japan

    Bulletin of the Chemical Society of Japan 82(8), 968-974, 2009-08-15

    The Chemical Society of Japan

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Codes

  • NII Article ID (NAID)
    10025126961
  • NII NACSIS-CAT ID (NCID)
    AA00580132
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    00092673
  • NDL Article ID
    10308264
  • NDL Source Classification
    ZP1(科学技術--化学・化学工業)
  • NDL Call No.
    Z53-B35
  • Data Source
    CJP  NDL  J-STAGE 
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