Resume -Nalls avons etudie 1a position s pectrale et 1a form e du seuil de reflexion due au plasma da ns des sels d e ca ti o ns radicaux du type (arene}zXF, en {onction de la nature de la molecule organique donneur et du transfert de charge en tre les molecules donneur s et accepteurs.Abstract -We have inve s tigated the spectral position and the form of the plasma edge of differ en t radical cation salts o f the type (arene)zXF, in dep en den ce of the type of the organic donor molecule, and o f the charge transfer between donor and acceptor mole c ules.An important condition for the occurrence of one-dimensional metallic conduction in organic compounds is a sufficient overlap of the orbitals of adjacent molecules in the direction of the axi s of the highest conductivity. In radical cation salts, co nsisting of organic donor molecule s and inorganic acc eptor molecules, the overlap of interest is that of the donor molecules in their stacking direction. In compounds containing tetrathiafulvalene (TTF) as d o nor mole c ule, it is probably mainly the size of the sulphur atom s that contributes to this overlap /1,2/. In order to enhance this overlap not parti c ularly pronounced, one has gone two different ways. The first wa s the replacement of the sulphur by the larger selenium atom, as for in stan ce in the radi ca l cation salts which contain tetramethyltetras e lenafulvalene (THTSF) as donor molecule /3/. The other consisted in the enhancement of the number of sulphur atoms per molecule. as in the compounds with bis (ethylenedithiolo)tetrathiafulvalene (BEDT-TTF) as donor molecule / 4/.There is an entir e ly different, after the o utlin ed way of reasoning surprising. possibility for the constru c tion of one-dimensional metals. By choosing as donor molecules simple arenes. as naphthalene (Na). perylene (Pe). pyren e (Py), o r fluoranthene (Fa). one desists from the bridg e fun c tion of large atoms. as sulphur or selenium /5-7/, The metallic conduction in these compounds is apparently caused by the overlap of the o rbital s of the r ela tiv e ly small carbon atoms.In the present paper we report on o ptical investigations for the determination of the e lectronic transport parameters of thes e co mp o unds as a fun c tion o f the type of the donor molecule and of the amo unt o f charge transfer between donor and acceptor.OThis work was supported by the stiftung Volkswagenwerk
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