Arnulf‐Dieter Schlüter

Suzuki Polycondensation: Polyarylenes a la Carte

This review draws a rather comprehensive picture of how Suzuki polycondensation was discovered in 1989 and how it was subsequently developed into the most powerful polymerization method for polyarylenes during the last 20 years. It combines insights into synthetic issues with classes of polymers prepared and touches upon aspects of this methods technological importance. Because a significant part of the developmental work was carried out in industry, the present review makes reference to an unusually large number of patents.

Functionalized rod-like polymers: one-dimensional rigid matrices☆

Abstract The synthesis of rigid-rod poly([1.1.1]propellane)s and poly( p -phenylene)s with hydroxy functionalities in the side chains is described. The suitability of these hydroxy functions as anchor groups for dendritic fragments is investigated. Initial experiments show that not only oligophenylenes as model compounds but also the polypropellane can be dendrimerized to a high degree of conversion. The rigidity of the backbones is considered important in regard to this matter and is therefore addressed theoretically. Molecular modelling calculations based on the AMBER 3.0 force field show that, in fact, the polypropellane backbone is considerably rigid.

Delocalization length and structure of oligopyrroles and of polypyrrole from their vibrational spectra

Oligopyrroles with increasing chain length and polypyrroles were recently synthesized with new chemical methods. In this paper, we analyze their infrared and Raman spectra. The spectra can be nicely interpreted in terms of recent theoretical concepts of vibrational dynamics of polyconjugated systems. The spectra thus become a tool for deriving information on the structure of these materials.

Progress toward the development of a chemical synthesis for poly(2,5-pyrrole)

Abstract The synthesis of a number of N-Boc-protected pyrrole oligomers, as well as a method to isolate a narrow fraction of N-Boc-protected poly(2,5-pyrrole) (DP = 20; PDI = 1.2) are described. Preliminary studies certify that Boc groups can be removed from pyrrole rings. Single-crystal X-ray structures of protected and unprotected oligomers are presented.

Investigations of the electronic transport in a new conjugated polymer

Abstract We present studies on the DC-conductivity of a new, fully unsaturated carbon ladder-polymer, which we doped with AsF 5 , K and Rb. The structure of the new polymer is based upon a collapsed fullerene, where every five-membered ring is bonded to three six-membered rings. This leads to a planarized, board-like structure for which we expect good transport properties. We found a conductivity change over several orders of magnitude after doping. Investigations of the temperature behavior of the conductivity revealed, that currently used models insufficiently describe the transport properties. We applied more complex, heterogeneous models, to describe the conductivity in the measured temperature range.