Advanced Materials

Cover image for Advanced Materials

April 1997

Volume 9, Issue 4

Pages fmi–fmi, 293–364

  1. Masthead

    1. Top of page
    2. Masthead
    3. Material Forums
    4. Essays
    5. Articles
    6. Communications
    7. Research News
    1. Masthead (page fmi)

      Article first published online: 29 OCT 2004 | DOI: 10.1002/adma.19970090401

  2. Material Forums

    1. Top of page
    2. Masthead
    3. Material Forums
    4. Essays
    5. Articles
    6. Communications
    7. Research News
    1. Material Forum (pages 293–294)

      Article first published online: 29 OCT 2004 | DOI: 10.1002/adma.19970090402

  3. Essays

    1. Top of page
    2. Masthead
    3. Material Forums
    4. Essays
    5. Articles
    6. Communications
    7. Research News
    1. Progress and perspectives in solar energy conversion (pages 295–297)

      Dr. Yukinoro Kuwano

      Article first published online: 29 OCT 2004 | DOI: 10.1002/adma.19970090403

  4. Articles

    1. Top of page
    2. Masthead
    3. Material Forums
    4. Essays
    5. Articles
    6. Communications
    7. Research News
  5. Communications

    1. Top of page
    2. Masthead
    3. Material Forums
    4. Essays
    5. Articles
    6. Communications
    7. Research News
    1. Mesogenic Zinc(u) complexes of 5,10,15,20- tetraarylethynyl-substituted porphyrins (pages 313–316)

      Dr. Lionel R. Milgrom, Dr. Gokhan Yahioglu, Prof. Duncan W. Bruce, Dr. Stephania Morrone, Dr. Fryad Z. Henari and Prof. Werner J. Blau

      Article first published online: 29 OCT 2004 | DOI: 10.1002/adma.19970090405

    2. Soluble alkyl- and alkoxy-substituted titaniumoxo phthalocyanines: Synthesis and photoconductivity (pages 316–321)

      Dr. Peter Haisch, Götz Winter, Prof. Michael Hanack, Larry Lüer, Dr. Hans-Joachim Egelhaai and Prof. Dieter Oelkrug

      Article first published online: 29 OCT 2004 | DOI: 10.1002/adma.19970090406

      The high photosensitivity of titaniumoxo phthalocyanines makes them suitable for application as charge generation materials, e.g., in photocopiers. The synthesis, photophysical, and photochemical properties of soluble titaniumoxo phthalocyanines containing alkyl and alkoxy substitutents (see Figure) in the periphery of the phthalocyanine ring are reported, the photoconductivity and photooxidation behavior being stressed.

    3. Properties of self-assembled monolayers (SAMs) from thiol-functionalized oligothiophenes (pages 321–326)

      Dr. Richard Michalitsch, Dr. Philippe Lang, Dr. Abderrahirn Yassar, Dr. Gerhard Nauer and Prof. Francis Gamier

      Article first published online: 29 OCT 2004 | DOI: 10.1002/adma.19970090407

      The introduction of electroactivity into a self-assembled monolayer (SAM) has been attempted as a step towards a tunable interface between metals and conjugated conducting polymers. The synthesis of terthiophenes bearing an alkylthiol function at their terminal position and their chemisorption onto platinum single crystals are described. The properties of this SAM were investigated by electrochemical surface analysis and contact angle measurements. The calculation of the orientation of the terthiophene units is outlined.

    4. Blue and green light emission from new soluble alternating copolymers (pages 326–328)

      Dr. Hyun Nam Cho, Dr. Dong Young Kim, Dr. Young Chul Kim, Dr. Jun Young Lee and Dr. Chung Yup Kim

      Article first published online: 29 OCT 2004 | DOI: 10.1002/adma.19970090408

      Visible-light-emitting alternating copolymers consisting of two different repeat units have been investigated. The synthesis and optical characterization of PDHFPPV (top in Figure) and PDHEMPV (bottom in Figure) are described. It is shown that these soluble copolymers can be used as the active layer in light-emitting diodes, just like the corresponding homopolymers.

    5. Growth mode of HgBa2Ca2Cu3O8+δ superconducting films prepared by a Sol-Gel method on a Yo0.15Zr0.85O1.93 Substrate (pages 329–331)

      Prof. Shimon Reich and Yzhak Tsabba

      Article first published online: 29 OCT 2004 | DOI: 10.1002/adma.19970090409

      The growth mode and structure of superconducting films of Hg-1223 (HgBa2Ca2Ca2Cu3O8+δ) are described. The results from atomic force microscopy and X-ray studies are presented and the implications for the unit cell discussed. The positions of the atoms relative to the substrate Y0.10Zr0.85O1.93 are calculated by computer simulation—showing that the growth is epitaxial. Hg-1223 is a member of the family of superconducting cuprates HgBa2Can−1CunO2n-2+δ, which are important for both science and technology.

    6. Highly oriented thin films of a substituted oligo(para-phenylenevinylene) on friction- transferred PTFE substrates (pages 331–334)

      Dr. Richard E. Gill, Prof. Georges Hadziioannou, Dr. Philippe Lang, Prof. Francis Garnier and Dr. Jean Claude Wittmann

      Article first published online: 29 OCT 2004 | DOI: 10.1002/adma.19970090410

      Highly oriented thin films of oligo(p-phenylenevinylene)s, oligoPPVs, provide information about the structure of polyPPV and structure-property relationships. It is shown that deposition of a substituted oligoPPV onto highly preoriented PTFE substrates leads to highly oriented thin films and that annealing produces a remarkable morphological change (see Figure and also the cover), an indication of epitaxial growth.

    7. Electrodeposition of quantum-confined metal/semiconductor nanocomposites (pages 334–338)

      Prof. Jay A. Switzer, Chen-Jen Hung, Eric W. Bohannan, Dr. Mark G. Shumsky, Dr. Teresa D. Golden and Prof. David C. Van Aken

      Article first published online: 29 OCT 2004 | DOI: 10.1002/adma.19970090411

      Electrodepositiona s an approach to quantum confinement is the idea behind the work on nanocomposite films of Cu and Cu2O reported here. The phase of the film electrodeposited from an alkaline aqueous solution of copper(II) lactate depends on the cathodic current density used, varying from pure Cu2O (a p-type semiconductor) to 98 mol-% Cu, the color of the film changing correspondingly; the electrode potential oscilates spontaneously at fixed current density. It is shown that the Cu2O crystallites exhibit the optical properties of quantum dots.

    8. Tetraethynylethene molecular scaffolding: Nonlinear optical, redox, and amphiphilic properties of donor functionalized polytriacetylene and expanded radialenes (pages 339–343)

      Martin Schreiber, Dr. Rik R. Tykwinski, Prof. François Diederich, Rolf Spreiter, Ueli Gubler, Dr. Christian Bosshard, Dr. Igor Poberaj, Prof. Peter Günter, Dr. Corinne Boudon, Dr. Jean-Paul Gisselbrecht, Prof. Maurice Gross, Dr. Ulrich Jonas and Prof. Helmut Ringsdorf

      Article first published online: 29 OCT 2004 | DOI: 10.1002/adma.19970090412

      Polymers with polytriacetylene (PTA) backbone (see the Figure), and also expanded radialenes (a new class of macrocycles with large conjugated all-carbon cores), are of interest because of their intrinsic two-dimensional π-electron conjugated pathways. The synthesis, electrochemical characteristics, and linear and nonlinear optical properties of donor-functionalized polytriacetylene and donor end-capped expanded radialenes are reported and discussed.

    9. The structure of small GaAs clusters (pages 343–345)

      Dr. Jiechao Jiang, Dr. Andreas K. Schaper, Dr. Rolf Schäfer, Dr. Takehiko Hihara and Dr. JöRg A. Becker

      Article first published online: 29 OCT 2004 | DOI: 10.1002/adma.19970090413

      Semiconductor clusters, particularly gallium arsenide, have potential applications in nonlinear optical devices. Special interest is generated by the fact that their optical and electronic behavior depends on the size of the cluster. Direct evidence is presented for the occurrence of hexagonal, i.e., wurtzite-type structure, GaAs in clusters, whereas bulk GaAs has zinc-blende structure. High-resolution transmission electron microscopy, atomic force microscopy and electron diffraction results are reported and interpreted. Suggestions are made for further work.

    10. Magnetic properties of nitronyl nitroxide radicals substituted in phenylboronic acid the BOH ⃛O hydrogen bond as a constituent unit of a one-dimensional suprastructure exhibiting a ferromagnetic spin interaction (pages 346–349)

      Dr. Takeyuki Akita and Prof. Keiji Kobayashi

      Article first published online: 29 OCT 2004 | DOI: 10.1002/adma.19970090414

      The NO…HOB hydrogen bond has recently been shown to play a role as an intermolecular ferromagnetic spin coupler. Studies of this bound in phenylboronic acid derivatives substituted by the nitronyl nitroxide radical moiety are presented, in particular the synthesis, crystal structure, and magnetic properties of the para-substituted phenylboronic acid shown in the Figure and the corresponding meta compound. Boronic acid derivatives bearing the NO radical center are shown to be promising precursors for molecular magnetic materials.

  6. Research News

    1. Top of page
    2. Masthead
    3. Material Forums
    4. Essays
    5. Articles
    6. Communications
    7. Research News
    1. Molecular optoelectronic systems (pages 351–355)

      Prof. Itamar Willner and Dr. Bilha Willner

      Article first published online: 29 OCT 2004 | DOI: 10.1002/adma.19970090415

      Molecular optoelectronic devices require, first, the design of a molecular entity whose chemical functions are reversibly triggered by external light signals and, second, integration with a solid support capable of electronic transduction of the photostimulated chemical processes at the molecular level. Two ways of functionalizing electrode surfaces are reviewed that fulfill these requirements, including a chemical system that mimics the function of a logic “AND”, i.c., an amplified amperometric signal is obtained only when two conditions are mct simultaneously.

    2. Concerted transport of electrons and protons across conducting polymer membranes (pages 357–359)

      Prof. Michio Matsumura and Prof. Teruhisa Ohno

      Article first published online: 29 OCT 2004 | DOI: 10.1002/adma.19970090416

      The efficient conversion of light energy into chemical energy is essential if solar energy is to be utilized successfully. The mechanisms of photosynthesis in green plants are used as guiding principles to propose different types of electron and proton transporting systems, for example, a chemical system based on polyaniline film, an electrochemical system using doped polypyrrole film, and the photochemical system shown in the Figure. Fig.

    3. Molecular patterning using two-dimensional polymer langmuir–blodgett films (pages 361–364)

      Dr. Atsushi Aoki and Prof. Tokuji Miyashita

      Article first published online: 29 OCT 2004 | DOI: 10.1002/adma.19970090417

      Langmuir–Blodgett (LB) films for high-resolution resists for the preparation of integrated circuits with higher densities are reviewed briefly. A technique based on the polymerization of monomeric LB films and a newer one based on the two-dimensional cross-linking of a polymeric LB film are described. It is demonstrated that cross-linkable polymeric LB films have the ability to create high-resolution molecular patterning with nanometer (layer) thickness. Examples of patterns produced with such films are presented.

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