A New Organic Conductor and a Novel Structural Phase Transition in the BEDT-TTF Trihalide Family

A new quasi-2D molecular conductorbased on BEDT-TTF with an assembly of the trihalide anions I2Br–, IBr2–, and BrICl– is presented here. This set of anions promotes the formation of α′- and α‴-type conducting layers (see Figure, top) along with a low-temperature α‴→β″ transition seen for the first time in BEDT-TTF salts.