Pyrazino-methyl-ethylenedithio- tetrathiafulvalene, Precursor of τ -Phase Conductors
G. C.Papavassiliou
a, A. Terzis
b, and C. P. Raptopoulou
ba Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48, Vassileos Constantinou Ave., Athens 116/35, Greece
b Institute of Materials Science “Demokritos”
NCSR, Athens 153/10, Greece
Reprint requests to Prof. G. C. Papavassiliou.
Fax (3 01) 7 27 37 94
Z. Naturforsch.56b,963Ð964 (2001);
received June 5, 2001
Tetrathiafulvalenes, Cation Radical Salts, Organic Conductors
Modifications of the previously reported meth- ods of preparation of racemic pyrazino-methyl- ethylenedithio-tetrathiafulvalene,i.e., 2-(5,6-dihy- dro-5-methyl-1,3-dithiolo[4,5-b][1,4]dithiin-2-yl- idene)-1,3-dithiolo[4,5-b]pyrazine, and their cat- ion radical salts with linear counter anions are re- ported. ESR spectra and preliminary X-ray dif- fraction measurements indicate that the salts crystallize in theτ-phase (tetragonal system).