This book constitutes the Proceedings of the NATO Advanced Research Workshop on Conjugated Polymers held at the University of Mons, Belgium, during the first week of September 1989. The Workshop was attended by about fifty scientists representing most of the leading research groups within NATO countries, that have contributed to the development of conjugated polymeric materials. The program was focused on applications related to electrical conductivity and nonlinear optics. The attendance was well balanced with a blend of researchers from academic, industrial, and government labs, and including synthetic chemists, physical chemists, physicists, materials scientists, and theoreticians. The Workshop provided an especially timely opportunity to discuss the important progress that has taken place in the field of Conjugated Polymers in the late eighties as well as the enormous potential that lies in front of us. Among the recent significant developments in the field, we can cite for instance: (i) The discovery of novel synthetic routes affording conjugated polymers -that are much better characterized, especially through control of the molecular weight; - that can be processed from solution or the melt; the early promise that conducting polymcrs would constitute materials combining the electrical conductivities of metals with the mechanical properties of plastics is now being realized; -that can reach remarkably high conductivities.

Inhalt

Theory of Conjugated Polymers and Molecular Crystals.- Survey of Electrically Conducting Organic Materials.- New Developments in the Synthesis and Doping of Polyacetylene and Polyaniline.- Synthesis, Characterization, and Applications of Substituted Polyacetylenes Derived from Ring-Opening Metathesis Polymerization of Cyclooctatetraenes.- Synthesis and Characterization of a Water Soluble Polyparaphenylene Vinylene Derivative.- Molecular Organization and Electrical Properties of Mixed Langmuir-Blodgett Multilayer Thin Films of Polypyrrole.- The Electronic and Chemical Structure of Poly(3-hexylthiophene) Studied by Photoelectron Spectroscopy.- Poly-1,2-Azepines by the Photopolymerization of Phenyl Azides: A New Route to Processible Conducting Polymers.- Polyheteroarylmethines, Syntheses and Physical Properties.- Conformation of Conjugated Polymers in Good Solvent.- Electronic Structure of Processable Conducting Polymers.- Bridged Mixed Valence Phthalocyaninato-Metal Compounds.- Polyaniline Processed From Sulfuric Acid and in Solution in Sulfuric Acid: Electrical, Optical, and Magnetic Properties.- Polyaniline versus Polyacetylene, or, Rings versus Bonds and the Roles of Barriers and Crystallinity.- Linear Polyenes: The Interplay Between Electronic Structure. Geometric Structure, and Nonlinear Optical Properties.- Semiconductor Device Physics in Conjugated Polymers.- Chemistry and Physics of Molecular-Based Polymers Exhibiting a Spontaneous Magnetization.- Ion Implanted Polyparaphenylene: Modifications of Lateral and in Depth Concentration Profiles upon Annealing.- The Electroactive Nature of Polyaniline. The Nature of the Chromaphores.- Transport in Oriented Polyacetylene.- Transient Photoconductivity in Polyacetylene and Molecular Electronic Aspects.- Dehydrochlorination of Polyvinylchloride by Phase Transfer Catalysis.- Vinylene-Linked Low-Band-Gap Conducting Polymers: Electronic Structure and Defects.- Organic Conjugated Materials for Optoelectronic and Applications.- Nonlinear Optics of Conjugated Polymers: Progress in Science and Prospects for Technology.- Transition Dipoles of Polyacetylene Oligomers.- Linear Optical Properties of a Series of Polyacetylene Oligomers.- Novel Linear and Nonlinear Optical Effects in Polydiacetylenes.- Nonlinear Optical Properties of Ultrathin Polymer Films.- Third Harmonic Generation of Polythiophene Derivatives.- Third Order Hyperpolarizability of Polythiophene and Thiophene Oligomers.- Exciton Relaxation in PDA-4BCMU: from Crystals to Films.- Photoinduced Absorption and Nonlinear Optical Response in a Polycondensed Thiophene-Based Polymer (PTT).- Study of Second Harmonic Generation of a Hemicyanine Dye in Floating and Deposited Organic Monolayers.- Nonlinear Optics in Solid Schiff Bases.- Triplet Exciton-Polarons in Polydiacetylene Single Crystals.- Diffraction by Holographic Gratings in Diacetylene Crystals.- Scanning Tunneling Microscopy at the Polymer-Metal Interface.- Nonlinear Optics Coefficients of Polyenes: Size and Alternation Dependence.- Electronic Structure and Static Electric Dipole Polarizability of Acetylenic Analogs of Carbocyanines.- Macrocycles as Molecular Units to Build up Electroresponsive Materials: A Comparative Theoretical Investigation of the Electronic and Optical Properties of Phthalocyanine and Related Systems.- Control of Intramolecular Interferences Through Benzene and Cyclophane Using Donor and Acceptor Groups.- Organic Crystals and Quadratic Nonlinear Optics: The Transparency-Efficiency Trade-off.- Conducting Polymer Electromechanical Actuators.- Working Group Reports:.- - Prospects in Synthesis and Processibility of Conjugated Polymers.- - Molecular Electronics Prospects.- - Theoretical Developments.- - Optoelectronics Prospects.- - Electronics Properties.