Synthesis and Properties of Several New Molecular Conductors
The preparation of highly-conducting materials which contain stacks or chains of coordinated metal ions continues to challenge synthetic chemists. As a synthetic aid, Keller (1) has developed guidelines for the preparation of such materials. These guidelines derive from both experimental observations and interpretations of the excitonic theory of superconductivity (2). This theory requires that a spine of delocalized charge carriers interacts via an excitonic mechanism with a proximal array of polarizable molecules (or ions) which will largely determine the exciton frequency. Although Little (3) has proposed several specific model compounds in which the essential features of the model might be realized, to date theoretical expectations are more nearly realized for the “organic metal” conductors than for the columnar transition-metal complexes. The latter materials possess a more-or-less conducting spine which is not strongly coupled (mechanically or electronically) to other molecules or ions in the lattice. Although this “insulation” of the conducting spine may lead to enhanced anisotropy in the electrical conductivity, it may also drastically lower the superconducting transition temperature of the material (by way of a Peierl’s distortion or similar mechanisms.)
KeywordsMolecular Conductor Conducting Spine Room Temperature Magnetic Moment Iodine Oxidation Rubeanic Acid
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