SYNTHESIS AND CHARACTERIZATION OF AN EXTENDED TETRATHIAFULVALENE DERIVATIVE COORDINATED TO COPPER IODIDE AND ITS CHARGE-TRANSFER AND RADICAL-ION SALTS

A new bisfunctional TTF type donor molecule (D-sigma-D) with a copper iodine bridge has been synthesized and characterized. Its salts have b een prepared using standard crystallization techniques. The structural , electrical, optical and low-temperature magnetic properties of these new compounds have been investigated. It has been shown in particular that the compound (D-sigma-D)(TCNQ)(3) presents a low-temperature mag netic ground state which is connected to the antiferromagnetic interac tions of the bis-radical cation. This result opens the way to prepare new extended-hybrid TTF molecules containing paramagnetic metals showi ng related magnetic and electrical properties.