Bilayer Molecular Metals Based on Dissymmetrical Electron Donors

The electrocrystallization from solutions
of cyanobenzene-ethylenedithio-tetrathiafulvalene (CNB-EDT-TTF) in
the presence of different anions X = ClO4–, PF6–, and I3–, affords a new type of 2D molecular metals with composition (CNB-EDT-TTF)4X based on an unprecedented bilayer structure of the donors
induced by effective head to head interdonor interactions through
the nitrile groups, which is responsible for 2D metallic systems with
unusual properties such as the higher band filling, larger effective
mass of carriers, and almost degenerated double Fermi surfaces.