(CPDT-STF)(TCNQ): a new charge-transfer complex metallic down to low temperature

A new charge transfer complex (CPDT-STF)(TCNQ) has been prepared. An X-ray crystal structure analysis revealed that this complex is composed of the do nor and acceptor sheets orthogonally arranged to each other, which is simil ar to (ET)(TCNQ) and (ET)(TCNQF(1)). The band calculations indicate that th e CPDT-STF layer has a significantly two-dimensional interaction, while the TCNQ one has a one-dimensional Fermi surface. The electrical resistivity o f the present complex showed metallic temperature dependence down to 0.6 K. The thermoelectric power was negative and changed from the positive to the negative gradient at 60 K. The static magnetic susceptibility and transpor t properties indicate coexistence of local and itinerant electrons in the p resent complex. (C) 1999 Published by Elsevier Science Ltd. All rights rese rved.