Les complexes a transfert de charge de la serie du TTF-TCNQ

¹ Centre de Recherches Paul Pascal, C.N.R.S., Domaine Universitaire, 33405 Talence Cédex Laboratoire de Cristallographie, Université de Bordeaux I, 33405 Talence Cédex Laboratoire de Chimie Organique Structurale, U.S.T.L., 34060 Montpellier, France.

Résumé

Cette mise au point porte sur la série des complexes à transfert de charge du tétrathiofulvalène-tétracyanoquinodiméthane (TTF-TCNQ). L’ensemble des travaux que nous avons faits est présenté et situé dans le courant général de ce thème de recherches La fabrication de ces nouveaux matériaux, les données physico-chimiques, les propriétés structurales et physiques sont analysées. Des corrélations entre les différents matériaux et un effort de classification, ont été effectués pour comprendre leur comportement et essayer de prévoir de nouveaux composés.

Abstract

This general study is devoted to the charge transfer complexes series tetrathiofulvalenium-tetracyanoquinodimethane (TTF- TCNQ). This is the unique series known on which it has been possible to play with the organic synthesis in order to modify the physical properties.

Our results obtained during these last years are presented inside the framework of the current investigations on the organic conductor field. In the different parts of this review we firstly present the chemistry of these new materials together with the physical chemistry characteristics. The second part deals with the structural works and the third one with the electronic system and the physical properties.

An analysis is carried out to show quantitative correlations between the different materials which are conductors and what are the pertinent parameters to classify these compounds. An effort is made to understand the physical properties, in particular the occurence and the stability of the metallic state, on one hand and to foresee about new compounds on the other hand.