Jens Barche

Martin Luther University of Halle-Wittenberg, Halle-on-the-Saale, Saxony-Anhalt, Germany

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Publications (6)16.23 Total impact

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    ABSTRACT: ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
    ChemInform 01/2010; 28(4). DOI:10.1002/chin.199704173
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    ABSTRACT: Ideal materials used in organic electronics should possess both a high order to exhibit high charge carrier mobility and easy processability to achieve low cost production. While single crystals only meet the first property, polymers usually only meet the second. To combine both, it would be desirable to conserve the order of liquid-crystalline phases over a wide temperature range as needed for practical use. In this paper, a synthesis of different liquid-crystalline materials is reported that incorporate both an aromatic heterocyclic core responsible for the semiconductor character and a cross-linkable group to freeze in the liquid-crystal order at a suitable temperature. The liquid-crystalline phases are investigated, and cross-linking experiments are performed. The structure of the prepared films is investigated by X-ray diffraction.
    Chemistry of Materials 10/2004; 16(22-16). DOI:10.1021/cm049352l · 8.35 Impact Factor
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    ABSTRACT: For the development of n-channel field-effect transistors it is indispensable to look for semiconducting polymers with electrons as majority charge carriers (n-type). In addition high electron mobility values are of significant advantage in these compounds. Polymers with electron transporting properties have been rarely investigated. Main chain polymers with strong acceptor units like 1,2,4-triazoles-4H are potential candidates for electron transporting materials in electronic devices. Therefore, a synthetic pathway leading to an organo-soluble polymer consisting only of 4-hexyl-1,2,4triazole-4H units in the main chain is presented in this work. We will report the synthesis using modified classical polycondensation. The chemical and electronic properties of the polytriazole have been investigated in detail. The material has been used to prepare "electron-only" devices for the calculation of the electron mobility. The suggested chemical structure of poly (4-hexyl-1,2,4triazole-4H) (PHTA).
    Macromolecular Chemistry and Physics 09/2004; 205(14):1916 - 1922. DOI:10.1002/macp.200400095 · 2.62 Impact Factor
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    ABSTRACT: The successful realization of n-channel field-effect transistors requires the application of semiconducting polymers with high electron mobility (n-type). However, reports on n-type polymers are rather scarce in the literature. Therefore, the development of polymers with suitable electron transport properties is particularly challenging for the synthetic chemistry. Main chain polymers with strong acceptor units, such as 1,3,4-heterodiazoles, are potential candidates for electron transport materials in electronic devices. The fluorene unit is another ring system with interesting physical and chemical properties, which is often used in rigid-rod, main chain polymers. The present work introduces the synthesis of organo-soluble copolymers consisting of alternating fluorene-, 1,3,4-heterodiazole, and, in some cases, additional 2,5-dialkoxyphenylene units in the main chain. The reported synthesis involves modified classical polycondensation as well as the tetrazole route. We demonstrate the possibility of exchanging oxygen in the heteroaromatic ring with sulfur using Lawesson's reagent during the ring closure reaction. An alternative structure of the heterocyclic ring with N-phenyl in the oxygen position is feasible using the tetrazole synthetic route. The chemical and electrochemical properties of the copolyfluorenes are investigated in detail. Some of the synthesized copolyfluorenes have also been used for the preparation of "electron-only" devices enabling the calculation of the electron mobilities. Further, an organic field-effect transistor (OFET) characteristic was shown. [GRAPHICS]
    Macromolecular Chemistry and Physics 01/2004; 205(2):187 - 198. DOI:10.1002/macp.200300046 · 2.62 Impact Factor
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    ABSTRACT: Various monocyclic 1,2-dithiines 6a,b,d-t were prepared via (Z,Z)-1,4-difunctionalized butadienes (4-11,19,20). A twisted cyclic structure A is unequivocally proved rather than of the ringopened valence isomer B. The reactivity of these 1,2-dithiines is described. Thermal as well as day-light induced sulfur extrusion is an important feature of their chemistry. The latter mode of sulfur extrusion depends to a significant extent on absorption in the visible region. Copyright (C) 1996 Elsevier Science Ltd
    Tetrahedron 09/1996; 52(39):12677–12698. DOI:10.1016/0040-4020(96)00752-1 · 2.64 Impact Factor
  • Jens. Barche
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    ABSTRACT: Halle, Universiẗat, Diss., 2001.

Publication Stats

55 Citations
16.23 Total Impact Points


  • 2010
    • Martin Luther University of Halle-Wittenberg
      • Institute of Chemistry
      Halle-on-the-Saale, Saxony-Anhalt, Germany
  • 2004
    • Fraunhofer Institute for Applied Polymer Research IAP
      Potsdam, Brandenburg, Germany