Advanced Materials

doi: 10.1002/adma.19920040201pmid: N/A

Boldyrev, Vladimir

doi: 10.1002/adma.19920040202pmid: N/A

The deficiencies in the teaching and representation of solid‐state chemistry are two of the topics addressed including the classification of this branch of science within IUPAC. The options presented are based on the answers given to a questionnaire by some of the world's leading chemists and suggestions are made for improvement.

Böhnlein‐Mauß, Jutta; Sigmund, Wolfgang; Wegner, Gerhard; Meyer, Wolfgang H.; Heßel, Friedrich; Seitz, Katharina; Roosen, Andreas

doi: 10.1002/adma.19920040203pmid: N/A

Polymeric additivess have a great influence on the processing parameters in the produciton of high‐performance ceramics. The various types of additives are described and the interactions between the organic additives and the inorganic ceramic powders, some examples of which are shown in the figure, are examined with emphasis on one of the most important ceramic forming processes.

Jezzard, Peter; Wiggins, Christopher J.; Carpnter, T. Adrian; Hall, Laurance D.; Jackson, Peter; Clayden, Nigel J.; Walton, Nicholas J.

doi: 10.1002/adma.19920040204pmid: N/A

Since its inception in the early 1970s, the nuclear magnetic resonance (NMR) imaging technique has developed to the point that it is now used as a routine clinical diagnostic tool in many hospitals. As a result, virtually all; research in NMR imaging was until recently directed towards mapping the water and lipid distribution contained in human soft tissue, and it is only within the last few years that a start., has been made in exploring the non‐medical applications of NMR imaging. In this review article we discuss some of the many applications of NMR imaging to studies of the production and evaluation of 'advanced materials', particularly polymers and polymer composites, and review some ofthe studies which have already been undertaken. It is hoped that this article will be read both by polymer scientists and engineers interested in this powerful new research tool for studying their materials, and also by those already involved in other aspects of NMR imaging who are seeking challenging new problems.

Anton, Ute; Bohnen, Angelika; Koch, Karl‐Heinz; Naarmann, Herbert; Räder, Hans Joachim; Müllen, Klaus

doi: 10.1002/adma.19920040205pmid: N/A

The relationship between charge‐storage capacity and π‐topology in conjugated polymers needs to be understood in order to optimize polymer structuress for use in, for example, anodic electrodes in secondary lithium battery elements. Cyclic voltammetry has been used to study the redox behavior of conjugated oligomers related to that shown in the figure.

Zhao, Xiao Kang; McCormick, Larry D.; Fendler, Janos H.

doi: 10.1002/adma.19920040206pmid: N/A

Semiconductor particulate films, exhibiting either p‐type or n‐type behavior, have been produced by varying the synthetic method. Infusion of NH3 into arachidic acid (AA) monolayers floating on an aqueous solution of Pb(NO3)2 and CS(NH 2)2 results in p‐type films while the infusion of H2S into AA monolayers on aqqueous Pb(NO3)2 results in n‐type films. The preparation and characterization of the films are described.

Corain, Benedetto; Zecca, Marco; Jeřàbek, Karel; Lora, Silvano; Palma, Giancarlo

doi: 10.1002/adma.19920040207pmid: N/A

A molecular composite representing a new way of dispersing metal centers on solid supports is reeported. Co‐polymerization of vinylferrocene with dimethyl‐acrylamide in the presence of a cross‐linker inside a polyacrylamide resin matrix results in an interpenetratiing organometallic polymer network based on the unit ssshown in the figure.

Spotts, James M.; Scaefer, Willams P.; Marder, Seth R.

doi: 10.1002/adma.19920040208pmid: N/A

Organometallic compounds with large transition dipole moments and small energy gaps are of potential interest as second‐ and third‐order nonlinear optical materials. Organometallic anaologues of cyanines with electropositive metal centers as the end groups, in which the electronic coupling between the transition metal and the organic fragment is strong, should lead to improved exinction coefficients and great potential in nonlinear optics applications.

Bäuerle, Peter

doi: 10.1002/adma.19920040209pmid: N/A

New end‐capped oligothiophenes (see figure) have been synthesized via nickel‐catalyzed Grignard cross‐coupling reaction. Dueto the reactive positions in the terminal thiophene units being blocked it is possible to accurately characterize the spectroscopic and electrochemical properties of the materials. Estimation of the properties of an 'ideal' polythiophene consisting of 'infinite' chains can be made via extrapolation.

Delabouglise, Didier; Hmyene, Mohamed; Horowitz, Gilles; Yassar, Abderrahim; Garnier, Francis

doi: 10.1002/adma.19920040210pmid: N/A

A fusible, soluble sexithiopphene is reeported and it is shown that this material can be electropolymerized to form thin polymeric layers which exhibit well‐defined redox behavior and high contrast electrochromism. This is an important step towards increasing the conjugation lenght in these materials, efforts which had previously been hampered by the insoluble nature of oligomers with six or more thiophene units.