Propriétés Physiques et Structurales d'un Nouveau Complexe de Transfert de Charge Mixte du TCNQ et de l'iode

Characterization of trimethylammonium iodide and 7,7,8,8-tetracyano-p-quinodimethane reaction product. A one-dimensional "metal-like" complex

“…This complex contains 1-D chains of both TCNQ and halogen. 23 We were interested in studying the stoichiometry and thermal properties of this novel tertiary component com-plex to ascertain the TCNQ/X ratio and whether or not thermally activated iodine loss could be effected without structural modification [as observed20 for MfHDPG^X^]•…”

Evidence for structural transitions in onedimensional organic conductor TMA-TCNQ-I obtained by high voltage electron diffraction at low temperature

“…Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyslet:01982004308028500 insulator transition (TB~ ~ 150 K) [3], can be easily reached by our experimental devices. On the other hand, X-ray and neutron diffraction data can be clarified or complemented by electron diffraction studies.…”

“…Several anomalies have emerged. First, a metal-insulator transition is observed at TMI ~ 150 K [3][4][5]. Around 100 K, the electron paramagnetic resonance (EPR) line width passes through a maximum after which it decreases rapidly [6].…”

“…The crystal structure of TMA-TCNQ-1 has been described by Cougrand et al [3], additional details being given by Filhol et al [8][9]. Figure 1 shows a projection along the b axis parallel to the chains of atoms of the monoclinic unit cell (a = 20.353 A ; b = 6.456 A ; c = 13.922 A ;…”

Etude par la diffraction des neutrons de la structure à 80 K du complexe mixte de la triméthylamine avec le tétracyano-7,7,8,8 p-quinodiméthane et l'iode: TMA+.TCNQ2/3−.(I3 −)1/3

“…La pr6paration, les propri&6s structurales et physiques du sel de l'anion radical mixte t&racyano-p-quinodim&hane-iode et du cation diamagn&ique trim&hyl-ammonium (TMA-TCNQ-I) ont &6 rapport6es pour la premiere fois par Cougrand et al (1976). Abkowitz, Epstein, Griffiths, Miller & Slade (1977) ont montr6 que la conductivit6 61ectrique, qui est de type m&aUique unidimensionnel au-dessus de 240 K pour certains 6chantillons, pr6sente une singularit6 h 150 K. Les autres propri&6s physiques caract6ristiques de ce compos6, notamment le paramagn&isme, la chaleur sp6cifique (Delhaes et al, 1977), la permittivit6 et la conductivit~ hyperfr6quence (Miane, 1977), pr6sentent aussi une singularit6 h cette temperature.…”