A study of alkali metal triphenylides in the solid state
Résumé
In the search for new organic superconductors based upon aromatic radical anions, recent theoretical predictions indicated that polycyclic aromatic compounds could be some interesting candidate. Among them triphenylene (Tp) seemed to be an interesting candidate. Triphenylides containing one, two or three alkali metal atoms (K, Rb, Cs) per Tp were synthesized. Only K salts had a semi-conductor like conductivity with a gap of 0.16 eV, all the others were insulators. Very weak LFMA signal was obtained for KTp at 4 K. A signal at g=4 was observed in the ESR spectrum of K2Tp and Rb2Tp. Infrared and Raman spectra of the solids are reported.