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Pyrazino-methyl-ethylenedithio- tetrathiafulvalene, Precursor of τ-Phase Conductors

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Pyrazino-methyl-ethylenedithio- tetrathiafulvalene, Precursor of τ -Phase Conductors

G. C.Papavassiliou

a

, A. Terzis

b

, and C. P. Raptopoulou

b

a 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).

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